I have a real allergy to melted or cooked cheese and have been writing to help others find answers. Here's my story.
Diarrhea, an Upset Stomach, or Vomiting after Eating Cooked Cheese?
In this article, we are going to look at the issue of the melted cheese allergy. I have been allergic to melted or cooked cheese since I was a child. My father has the same problem. So I have been searching for answers: Can someone have a melted cheese allergy but be fine with normal, uncooked cheese? What is the difference between melted cheese and standard cheese? In this article, we will take a look at the answers to these questions.
You have likely come here looking for answers about why you are allergic to melted cheese—hopefully, I can help you. Or maybe you know the reason and could shed some light on the matter—in that case, please post it in the comments.
First of all, let’s take a look at exactly what my problem is.
My History With Melted Cheese
I first became aware I had an issue with cooked cheese when I was around the age of five. I attended a friend's party, and we all ate pizza. This was my first experience with pizza, and I do recall enjoying it. However, an hour later, it had all come back up. At the time, we were unsure what had caused me to be sick, but as time passed, it became clear that I was allergic to melted cheese. My father had the same problem—he would feel sick if he ate any cheese that had been cooked.
So let me make it clear exactly what I mean by cooked cheese. I am fine with all other dairy products. I can eat yogurt, drink milk, and eat normal cheese to my heart's content. But soon as it melts, something happens to the cheese, and it makes me vomit. A big chunk of cheddar will be fine, but slice it up and pop it under the grill until it melts, and you can guarantee my stomach won’t be able to deal with it.
Over the years, I have endured some pretty strong abuse from friends who claim it is all in my head. They are convinced I can’t actually be allergic and it is just something I have made up.
A few years ago, some of my friends put this theory to the test. I visited their house for a meal and for starters we had stuffed peppers. The peppers had several tasty ingredients, one of which was cooked cheese. As there was only a small amount, and it was hidden away in the peppers, my friends assumed I would have no reaction, thus proving them right. I ate the peppers and commented on how tasty they were. An hour later, I was hanging over the toilet, and my friends were apologising. This proved that the cheese allergy isn't psychosomatic.
Searching for Answers
In my past, this issue has come up time and time again. When I go out for a meal or visit a friend for dinner, the issue of cooked cheese will inevitably arise. The fact is there are so many meals that contained cooked cheese that sooner or later someone is going to offer it to you. So I am often asked, "How can you be allergic to melted cheese and not normal cheese?" I hate being asked that question as I really don’t have an answer. I have spent hours searching online for answers, and I have found other people that suffer from the same problem, but as of yet, I have had no conclusive answers as to what the problem may be.
Usually, when it comes to medical problems, the Internet is a wealth of knowledge. But for some reason, there are very few answers to this particular question. One thing I have noticed is that there are plenty of theories out there. I have also had quite a few people offer their own theories as to why I have a melted cheese allergy. So now I want to tell you a few of the theories that people have come up with over the years.
The first one is one that I have little faith in. It has to do with lactose intolerance. I have seen many so-called professionals stick their noses out on forums and say, "Clearly you are lactose intolerant." However, if that were the case, surely I would have a problem with other dairy products. The fact is that every other dairy product I consume causes me no problems. I can eat masses of cheese and drink pints of milk and be just fine. So for me personally, I would say the theory of being lactose intolerant does not hold water.
Another theory is that the consistency of the cheese makes me sick. This is another one I have an issue with. Admittedly, I find melted cheese dribbling out of a grilled cheese unappealing since I know what it does to me. But cheese that has been cooked, but is no longer melted—for example, on cold pizza—has the same effect. What's more, last year, I made the mistake of eating broccoli and Stilton soup. I was sick once again, even though the consistency of the cheese was a liquid, not the gooey texture you get in a grilled cheese. So again, as far as I am concerned, this theory falls flat on its face.
The Physicist's Idea
One theory that I do subscribe to is one that I actually heard from a physics teacher. He was present at a dinner party I attended and the argument once again came up. To my surprise, he took my side in the argument and said that there is a chemical reaction in the cheese when it melts. The fats in the cheese separate. To be honest, a lot of what he said went over my head, but it involved trans fats and the way the body digests them. He also mentioned the fact that heating cheese can kill off the enzymes that help in digestion, so melted cheese can sometimes be harder to digest. This seems like a fair point, and it could explain the problem.
I'm Not Alone With My Allergy (and Neither Are You!)
One thing that I have learnt while researching this whole problem is that I am not alone in my melted cheese allergy. The fact is that there are quite a few people out there who have the same problem. Although this is something that can be a nuisance, it is not the sort of issue that is going to be life-threatening. That is probably one of the reasons why there is so little information about the allergy anywhere online.
Read More From Patientslounge
If you know of anyone who has this allergic reaction or maybe you yourself struggle to digest melted cheese, feel free to post a comment on the bottom of the page. The same goes if actually have a conclusive answer to why it happens and have stumbled across this page. Either way, hopefully this article will have given you some clues as to why some people, including myself, are allergic to melted cheese.
Since writing this article, I have been amazed at how many people have gotten in contact with me. It turns out there are more people suffering from the problem of melted cheese intolerance than I first thought. As you can see from the comments below lots of people have the same reaction as I do to cooked cheese and many people have other similar problems to various other forms of dairy. It looks as though this is an issue that is now affecting more people than I had thought.
This content is accurate and true to the best of the author’s knowledge and does not substitute for diagnosis, prognosis, treatment, prescription, and/or dietary advice from a licensed health professional. Drugs, supplements, and natural remedies may have dangerous side effects. If pregnant or nursing, consult with a qualified provider on an individual basis. Seek immediate help if you are experiencing a medical emergency.
Livo on August 16, 2020:
I found your article by searching, "why does cheese settle stomach, but melted cheese upsets it?"?" I don't have your reaction, but there is definitely a difference between the two. In the case of fondue, l find I become very constipated. I thought it was the separated fat being greasy. I'm very surprised by how many other people have similar reactions.
ioanna on July 19, 2020:
I have a problem with liquid dairy. I can have cheese, chocolate or products that include powder milk or cheese just fine, but melted cheese, yogurt, ice cream and milk, kills me. Not sure if it's lactose intolerance or something else but there you go!
Lisa on July 15, 2020:
This is exactly me!!! I cannot have any cooked cheese without being sick for the rest of the day/night
Anthony on July 14, 2020:
I was fine all my life with melted cheese up till around 8 years ago. Something in my body has changed and I end up with terrible stomach issues once melted cheese eaten so avoid. I'm now 48 and can eat any dairy including uncooked cheese with no issues. I subscribe to the fact that a chemical reaction causes the cheese fat to become irritable / undigested in certain people. I find the same to be the case with certain meat fat such as pork rind and steak fat.
Steph on July 11, 2020:
I've had this same problem for years. Any melted cheese makes me feel extremely queasy, and although I never actually throw up from it, I always have a lot of stomach pain and feelings of sickness alongside eating it. I'm just the same in the fact that I'm fine with other dairy products and can eat unmelted cheese just fine! It's very weird and I wish we had an explanation to why it happens!
Wayne on July 05, 2020:
I have the same issue. I get it with any melted cheese. Although if soft cheeses like mozzarella have cooled down I’m fine. But if cheddar is hot or cooled after melting I get terrible stomach issues. I find if I go lactose free for 6-8 weeks My system reboots and I can allow melted cheese back in slowly but eventually it kicks off again and I have to stay away from it.
It a pain and doctors just look at me blankly they be clueless.
Sally on June 12, 2020:
Melted cheese gives me violent diarrhoea. I have a diagnosis of Bile Acid Malabsorption. It is not the only food that causes me to have an upset stomach but it is one of the prime candidates. I can eat uncooked cheese without a problem. I guessing it has something to do with the fat in it! If I have taken my tablets and don’t over do things I can know tolerate it.
Sidney on May 13, 2020:
I’ve been having this issue for the past few years but ONLY with cheese dip! Mainly white cheese dip from Mexican restaurants!
Never pizza, or cheese in sandwiches, Mac and cheese, etc! In fact, we ended up eating Mexican tonight and I decided I would eat some cheese dip (knowing better) and here I am 3 hours later with dull, but strong stomach pain! Never nausea, vomiting, diarrhea, but just pain and it lasts anywhere from 1-2 hours! Ugh!!!!!
Erin on May 08, 2020:
I'm so glad I found this!!
This only started happening to me recently and it has been quite a struggle trying to figure out what's been going on! I think I'm either still in the early stages, or it also depends on other things because so far I have no problem with melted Mozzarella, and am able to have melted cheddar sometimes with no repercussions. I also had noticed a stomach ache after eating pancakes that had cream cheese in them but when I tried eating plain, cold cream cheese the other day I had no issue!
Kenzy on April 28, 2020:
I've been having the same issue for the past two years, but only with sandwiches! If I eat pizza, lasagna, ravioli, etc., I'm fine! But if it's a grilled cheese sandwich, panini, toasted Subway sandwich, etc. I get extremely ill and have cramping for around 3 hours (1-2 if I drink baking soda water).
Unfortunately, I've had multiple professionals point to my previous allergy to any dairy products as the reason (that allergy is now non-existent). I also ended up having this conversation with my biology teacher since I had to specify it for a school trip, and he suggested it's probably because of the enzymes being burned off and the fats separating as well. This is reassuring knowing it isn't just me having this issue.
Lauren Troup on March 20, 2020:
Hello everyone i have been very ill for a long time. I have lyme disease and can not eat melted cheese. Its actually made me come down with a fever in the past. I suspect i have MCAS. Its a histamine issue and would explain the enzyme theory someone suggested to you.
Mama Val on March 11, 2020:
Well, last night was SEVERE diarrhea and cramping for 3 hours after eating melted cheese. I just had a penchant for it, but I think I've definitely proved I can't eat it AND the same happens with butter.
I sure wish there were more answers from other folks, but I'm not so good with scrolling. Can you tell us if anyone has given you any ideas or answers? Should I get an iGg test?
Sue on February 28, 2020:
Yes definitely me ... I have had this for years . Didn't understand why melted cheese bothers me but regular cold cheese doesnt!!
kn on February 16, 2020:
I have this!! I can eat any form of dairy unless it’s melted, then I get horrible a stomach ache within an hour. Even with melted cheese that’s been refrigerated, like the author. I get made fun of all the time bc of it and people never believe me. It’s also sad bc mozzarella sticks are so good :( Lactaid usually helps me
Alex on December 22, 2019:
My mum has this too!
Athena on December 06, 2019:
I'm glad I googled this and found your page. You're definitely not alone. I too have a lot of dairy products but as soon as melted cheese from like chili or pizza enters my system, I get horrible tummy aches and I'm running for the bathroom multiple times.
Valerie Ashby on November 26, 2019:
Yes finally someone else out there like me!!! Im not alone and im not allergic to all melted cheeses only like creamy cheese sauces such as alfredos and macaronni and cheese i throw up if i eat them shoot i know what it does to me so i instantly wanna puke if i see or smell it and everyone thought i was crazy or it was all in my head too!!!
Joni on November 16, 2019:
I have had the same issue since I was like 13, I'm 43 now. It used to be so bad with cramping I would pass out. Of course Drs could never find the reason. A couple of years ago I began to take lactaid when I eat melted cheese. Definitely works for me.
Rosie on October 19, 2019:
Any kind of hot dairy upsets my stomach. Hot cheese I cannot eat but normal cheese I can, if there is a lot of cream in a cooked sauce, that also upsets my stomach. I thought I just had a stupid digestive system but nice to see I’m not the only one that this effects.
jen on October 08, 2019:
I am the opposite of you. I can have mozzarella and when cooked, but fresh will make me violently ill!!
Liz McGregor on October 04, 2019:
I am also on a search for answers about my dairy allergies... for some reason melted cheese, like nachos or pizza, is worse than any other dairy product for me. I break out in hives and get asthma attacks where as milk, yogurt, or "raw" cheese just gives me a runny nose and an upset stomach. Crazy how foods that taste incredible interact with our bodies and make us feel so sick!
Alan hiscox on September 18, 2019:
Like you i have a reaction to cooked cheese but no problem with any other milk products. Many foods make no mention of cheese in the ingredients but appear in the small print
Jaque123 on September 18, 2019:
I'm allergic to normal cheese (roof of mouth go crazy itchy) but can eat it when it's melted, any answers to this?? My mums the same!
Jennifer on September 07, 2019:
I was thinking more about this....I DO think there is a difference between how mozzarella and cheddar break down. I don’t get sick with mozza. I also think there must be a difference between melting and cooking a bit like on nachos.....i can eat a cheeseburger no problem but nachos or garlic bread with cheddar from a hot oven make me sick within an hour. Hmmmmm.
Mammamiasan on September 06, 2019:
OMG no one has ever addressed this issue in my life so far! Pizza killlllls me. Small amounts of fresh mozzarella not so much, for one example. Thank you!!! Love to see any updates on the science behind it. My family thinks I’m fussy when we order things but honestly my body speaks for itself I am just vocalizing it! Thank you thank you thank you :-)
BTW I have experimented with some vegan cheeses. Found some great ones so far. Unfortunately they’re not as pure with their ingredients as regular Cheeses but they make hell of grilled cheese and other melted items!
Oofpoof on September 05, 2019:
I never thought of it, but i do think i am allergic to melted cheese, although not as badly seeing as i only get stomach aches and nausea
Jennifer on September 05, 2019:
Over the past number of years, I started getting sick whenever I ate nachos. But I could eat lasagne. And other melted cheese. Tonight I made a weird variation on garlic bread, but the cheese was under the broiler. Delish. Now I am sick. I don’t always vomit, but I do sometimes. But I get get massive indigestion, and charming burps etc. Now I am wondering if there is something about the extent to which it is cooked. PIzza doesn’t usually bother me - although a lot likely would. Nice to know there may be a sensible chemical explanation at least for the basics of cooked versus raw. I have zero problem with uncooked cheese.
Jon on September 04, 2019:
Right there with you all; im 34 and had to instantly stop eating melted cheese this past year. I have no other allergies, but i experience near deat with even a bite of melted cheese.
Lol on September 02, 2019:
I recently noticed that eating grilled cheese made me nauseas and I also stopped liking pizza out of no where because it made me sick and I always eat Mac n cheese but today I’m just now realizing it’s what has been making me feel that way and I looked it up and wow
Kirsty on August 26, 2019:
Strangely I’m the opposite. “Raw” cheese will bloat me out to about 6 months pregnant within the hour!!
Carrie Patino on August 25, 2019:
Yes! I hid pizza under the rug as a kid because I was told to stay at the table and finish my food and I hated pizza. If I eat melted cheese, usually mozzarella or quest fresco, I have diarrhea in about 40 minutes. I can eat Brie without a problem, and even unmelted mozzarellas such as string cheese. The only other food that I know causes me a problem is bagels. I've been diagnosed with IBS, but truly the real problem is those foods. Grated cheddar on popcorn even a little melted is fine. Chile rellenos, enchiladas, cheese soups and even some bisques I avoided.Interestingly enough, on a trip to Lucerne, Switzerland I had cheese fondue, it was delicious and gave me no trouble at all. Thank you for confirming that it isn't in my head, but it's still a mystery. I do know a friend's daughter was a chemist whose job it was to add chemicals to make melted cheese gooeier and more stretchy, which I find even more disgusting. It could be some added chemical!
Meinir on August 23, 2019:
At last some kind of explanation and someone who suffers as like I do! Cheese is the main culprit, but also since a very early age I've had to avoid the lovely elaborate hot chocolate and variety of lates and cappuccino's others seem to enjoy to their hearts content!
I have got to an age now where calcium to avoid osteoporosis is essential, I dont think people realise how much calcium we really need as we get older, no plant based milk can touch the figure, and I love nuts, but I also have to be careful with the amount of nuts I consume due to the amount of fat they have in them. Like yourself, people keep banging on about 'you must be lactose intolerant', until recently I bought lacrose free cheese, and put it into a cheese sauce, result?
I was ill at exactly same time!
But it has been a relief realising that their are others suffering from the same intolerance. I wonder, has anyone out there experimented or had a different result with A1 and A2 milk?
nive667 on August 22, 2019:
I have started experiencing bloating and stomach cramps after eating melted cheese this year. It took me a while to figure it out because where I am from even Lactose intolerance is unheard of. I love Pizza but I guess I have to stop eating it now.
Trish926 on August 16, 2019:
I can’t tell you how many times I have searched for something like this. My daughter is affected in a similar way, but not always. There are many times that she gets a very itchy nose while she is eating melted cheese. Other times she will get a stomach ache and be in the bathroom for a while. Thank you so much for letting us know we weren’t just crazy!!
Judith on August 06, 2019:
I have a problem with melted cheese casing mild diarrhea within 30 minutes of eating. Cheddar, mozzarella and Monterrey Jack will do it. Pizza, quesadillas or cheese melted in microwave will do it. Feeling of lower GI upset with feeling of insecurity as if diarrhea may happen lasts about 4 hours. Can eat salad wit few shreds of raw cheese without symptoms. Had casein allergy as per IgG test in May 2018. Is worse with ultra filtered milk with high protein. No milk allergy on 2001 IgG test. Had to take antibiotics for dental extractions and implants in 2016 and 2017. About 6 rounds in all. Think that caused milk allergy but no allergy to lactose. No problems with milk or melted cheese for first seven decades of my life except post-nasal drainage. Think antibiotics threw me into allergy state. I realize they are necessary to prevent infection from going to the brain and have a friend who had that happen and almost died from brain tumor that was a cyst of staph infection.
Julie on August 04, 2019:
Yes me too. It seems mainly to be cheddar but only when cooked such as melted in an omelette or in cheese sauce. Gives me bad stomach pains then diarrhoea after about an hour. Had it when teenage then it came back in early 40’s. weird!
S on July 29, 2019:
I’ve had an intolerance to melted cheese since I hit my 20s. I used to be able to eat pizza, quesadillas, grilled cheese, and so on with no problems. But once I reached my early 20s, it all changed. I can’t handle even a bite of melted cheese anymore without it giving me horrible stomach pain and gas. I know I’m not lactose intolerant though, because I eat yogurt, ice cream, and cold cheese just fine. I thought for a while maybe it was a combination of the cheese and lots of grease or oil bothering my stomach, but I’ve never found any answers. These days, I just try and avoid it as much as I can. Nice to know I’m not the only one like this, at least.
Jim on July 05, 2019:
I have come to the same conclusion. In fact, i have tried Gluten free pizza, same problem...the following day i have stomach aches ans diarrhea. Like clock work.
Funny thing too, when i have steamed milk like a Latte i get stomach ackes too. Last night my wife made chicken quesadillas with melted cheese, today...same issues...
Ive been trying to narrow down this issue for a long time. I love pizza and even though, like clock work, the following day i have stomach issues, i continue to eat pizza.
I believe there is some sort of chemical breakdown heating dairy foods or cheese that causes some people this issue.
Have no idea how to fix it. But im paying close attention, because i am no givng up my pizza!
Sue on July 05, 2019:
Think you have just answered what’s wrong with my 2 year old! He rarely has cooked cheese and the passed couple of visits to his grandparents he’s had a cheese melt panini and pasta with cheese melted into it and then evening has been sick (obvs was thinking what are they giving him to make him ill) thank you for posting this
Tracy on July 03, 2019:
I can’t eat halloumi cheese without very bad pains in my stomach. Halloumi is a cooked cheese and this problem has only come to light since my move to Cyprus 3 months ago. In Cyprus halloumi is everywhere..
Als Moore on June 28, 2019:
Thank you for this article. I have a colostomy and have had a few surgeries on my stomach. I've had peoblems digesting various foods. Today I ate a tuna melt panini, forgetting how ill I was last time I ate one. I've spent the afrernoon with a VERY upset stomach so, I decided to look up why paninis mighf have this effect on me. As pizza can also have a similar affect, although not all pizza, Ive realised that this must be the reason. I like being able to understand it. I'll be avoiding melted cheese from now on!
Gaby on June 05, 2019:
Ive been having an issue with melted cheese ever since im about 4 or 5 years old. My mom would make toast with melted cheese for breakfast and every single time i ate it, it made me extremely nauseous but never to the point that i would throw up and after a little while the nauseating feeling would go away. could never figure this out and now even in my adult life i cant have melted cheese on toast it makes me feel very nauseous
Katherine B. on June 04, 2019:
I am so elated to hear I am not crazy on this issue! I’ve dealt with gastrointestinal issues for about over 12 years now (and still figuring it out) but out of all the discoveries one thing is for certain- I cannot have melted cheese. I frequently have goat cheese, cottage cheese and found eating cubed cheese doesn’t bother my stomach much if at all- but once it’s melted I am doubled over in the most excruciating pain and on the toilet with diarrhea. Every time. I’ve often wondered that it has to be something chemical that happens to the actual cheese during the melting/cooking process but this definitely gives me some insight. Quite frankly I’m just excited to hear I’m not alone with this.
Jabbajabbajabba on May 30, 2019:
I am fine with cold dairy, all cold cheese. Mozzarella and goat cheese hot or cold are fine for me. Warm milk, warm cream, and all other warm cheese all give me temporary runs. Happens about an hour after I eat and last only a couple of hours. The. I’m fine. I have found if I take lactase before I eat something that may have hot cheese or dairy I am fine. Not sure why I can eat cold dairy. Started to happen around the time I turned 50. I too have not been able to find a scientific explanation for this.
Fraser Grant on May 30, 2019:
I have a different problem with melted cheese I’m never sick but the smell gives me a banging headache but I’m fine eating it. Just wondering if there is anybody else with the same problem as me thanks
Sudiel on May 28, 2019:
I have had this all my life, wierdly i can have cooked mozzarella but nothing else. I love cheese, never have a problem with it unless its cooked. Its gotten so had now that i just have to smell it and i am sick, because i know if i eat it i will be really ill.
Natalie on May 21, 2019:
I'm the same! I get extremely sick from pizza, but a cold cheese sandwich is fine. Cheese on toast, fine. Yoghurt, fine. Lebanese cheese (shanklish), fine. Any bloody cheese is FINE. Except when melted.
Adam on May 16, 2019:
I put cheese on toast - bloating, gas, sometimes runs, cheese on regular bread - no reaction
I use tuna egg salad made with mayo on toast - bloating, gas, etc, put it on untoasted bread - things are just fine.
I used to eat grilled cheese sandwiches all the time with no problems, noticed this problem in my late 30's
Taylor on May 07, 2019:
I'm the exact same way! I love cheese and dairy, but I can't have melted cheese. Regular cheese and even queso is fine if it's completely melted into a liquidy cheese, but any sort of stretchy, gooey cheese makes me absolutely sick to my stomach. I had the exact same experience finding out with cheese on pizza. I now only put Feta on my pizzas since the cheese won't melt and it tastes amazing when browned on a pizza.
Zoe from the UK on May 07, 2019:
I have this problem too I'm pretty sure! Get like waves of bowel cramps, feel sickly and lethargic, even slightly feverish... I keep forgetting and then have melted cheese on toast, and wake up the next day feeling awful. Thanks for writing this article, very informative.
Olivia on May 02, 2019:
I feel like there are people who understand me and what I’ve been going through!! These stomach pains & cramps have been going on for almost two years and I definitely think it’s the MELTED cheese because I can eat other forms of cheese and dairy products! I haven’t found the perfect solution yet but peppermint tea sometimes helps, or GasX or Pepto Bismol (although these don’t completely make the pain go away).
Lisa on April 25, 2019:
This is regarding my daughter who is now 10. She seems to get sick only at night after eating white cheese and falling asleep and getting hot. Pizza... tonight she had a slider with “white” cheese and she just got sick! On occasion if she has a coffee from Starbucks to late and we don’t keep her cool she will get sick. But it all falls back to anything “white” in color and dairy and I’m assuming it curdles in her stomach and not really an allergy. So frustrating and always a surprise. Good luck to all in your journeys!
Baz on April 12, 2019:
For me, it's specifically cooked cheddar that's the problem. Cooked mozzarella on a pizza is fine, I'm guessing because it's a softer cheese to start off with.
With regards the cooked cheddar, I'll get stomach cramps a couple of hours later, and then I'll be off to the loo.
Bee on April 12, 2019:
I thought i was going crazy. Just recently I've noticed that have been getting really sick after eating homemade cheese sauce or even a grilled panini that always has melted cheese. At first I thought it was just food poisoning but then it kept happening. I don't vomit but I get excruciating stomach pains. I can eat regular cheese, milk, yogurt and some ice creams but i cannot eat cooked cheese. The chemical theory seems logical.
When I do get stomach issues I will make ginger tea. Ginger REALLY helps for nausea and upset stomach. Thinly slice up gingerroot and place it a pot of water, about 3 cups. Let it get to a boil then simmer it for about 10 min. For a stronger tea, take it off heat and let it continue to steep for another 20 min.
I will add a tablespoon of honey or agave for sweetness and a little milk. Your stomach will feel better in 20 min.
Anna P on April 11, 2019:
Hey! I'm not alone!! I have the same theory, about the chemical separation. I'm fine with chunks of cheese, I don't drink milk, but I do eat some dairy products and looove cheese! But I just can't eat it when is melted, like in a fondue or a quesadilla. Pizza has to be a lil bit cold or I gag
Jennifer on April 09, 2019:
I’m 36 now and this has been a problem for me since Thanksgiving dinner when I was 17... my uncle’s homemade Mac n cheese! In my family we call it my cheese disease. I avoid homemade Mac n cheese at all costs. Even the fake velveeta cheese in shells and cheese will tear me up. Pizza is ok for me. So after eating a cheese disease causing food, severe, immediate diarrhea hits. My entire colon is cleaned out in the most painful bathroom experience one might experience (minus murder or childbirth). Very loud gurgling noises can be heard traveling through my left side :(
Denise on April 08, 2019:
Everytime I eat something with melted /cooked cheese within an hour I have stomach pains which then leads to unbearable heartburn. I also have the same problem with hot milk ...yet I can add cold milk to coffee no problem. Until I read this article I thought I was going mad ..thank you
Th1964 on March 29, 2019:
Update : I bought some vegan cheese and put it in a pizza quite liberally. And I was fine, no side affects at all. Bad news is though I didn't like the taste.
ALUN THOMAS on March 29, 2019:
I just searched the internet as I had a grilled cheese sandwich and I feel very Sick I’ve got real bad stomach pain, and my poop has instantly turned to liquid. I also can eat uncooked cheese and drink milk or yoghurt. I am also laughed at by friends and family when I tell them I can’t eat cooked cheese. Glad I’m not alone, all jokes aside this intolerance is not nice and very frustrating.
Diane on February 26, 2019:
I have had problems with cheese my whole life. I can remember as far back is 2 years old being in the house and just smelling the melted. Reacting to it giving me dry heaves and vomiting. People don't seem to really get it. It makes it hard. It's like it really isn't taken seriously. One of the things that really bothers me is that people want to see what kind of reaction I would have. I understand their curosity horribley but with that puts me through physically would be devastating to me
Susan on February 11, 2019:
Same here, I've had problems with melted cheese, particularly pizza, for years. I can eat all other dairy no problem. I have found if I have cherry brandy with pizza I can eat a slice and not be too ill. I'm assuming there is something in the enzymes that upsets me and that something in the cherry brandy that helps digest it, my mum has similar problems but she is lactose intolerant, she swears sherry helps with her!
Sherry on February 10, 2019:
I also can eat regular cheese but nit melted ut causes severe bloating and pain. I do have trouble with a few other dairy products such as milk however none cause the pain that melted cheese does! Oh how i miss pizza!!
Gee-ess on February 08, 2019:
I think my my 11 y/o son may have developed an allergy to melted cheese literally over the past week. He has just been sick a few hours after having pizza and 4 days ago he was sick a few hours after having a cheese toastie. He doesn't have a high temperature and shows no other signs of being unwell. This is a very sudden change as 'Friday Night Pizza Night' has been a staple of our family routine for years and he has cheese toasties fairly regularly too. Macaroni cheese is another regular family favourite which has never caused him any problems before but i am now going to be nervous the next time we have that! I plan to take him to the GP to request allergy testing and hope I will be taken seriously. In the mean time I shall be following this thread with interest.
Th1964 on January 26, 2019:
At last someone else with exactly the same problem as me apart from that it doesn't make me sick but I just get a bad stomach the next day. I'm the same I can eat all other dairy products just not cooked cheese. I can eat cooked halloumi and cheese slices(plastic cheese as I call it). I don't eat any cheese now as my brain has me me not to. I haven't tried cooked vegan cheese as yet. I have only had this problem for about 8 years since my mid 40s.
Martha on January 20, 2019:
I have a similar issue although it only seems to be with certain cheeses. I had a fondue recently with no problems strangely but very ill with a raclette last year, and this weekend with cooked Munster cheese. So frustrating. While I have never been able to cope with deep fried food, it has got worse and the cheese thing started when some of my colon was removed. Apparently different parts of our colon digest different elements...
Ethan on January 19, 2019:
I have been dealing with a melted cheese allergy for decades now- since I was a kid. Whenever I eat it, I get extremely bloated and sometimes nauseous. I also get a stuffy nose to the point where I can’t breathe through it. Uncooked cheese, no problem at all. All other dairy...no problem. And until just now - I thought I was alone!
TERRY on January 09, 2019:
For years I have been wondering why I feel so sick after eating melted cheese, for example cheese omelettes, macaroni cheese etc etc but fine with hard cheese and dairy products, now I know, I am glad that I now have an answer and am not alone in suffering, motto of this little story stay away from cooked cheese.
regards to all
Kim on January 06, 2019:
This problem for me has only started in the past year ( I am 45). I get terrible cramps and diarrhea after eating any sort of melted cheese but yet I can eat normal cheese to my hearts content. Glad to know this is a thing! Thanks for writing this article ☺️
Anna on December 20, 2018:
My son gets sick after melted cheese, but is fine with cheese not melted. We had him tested as he comes up as lactose intolerant but it doesnt show in any other form. Thank you writing the article
Katarina on December 15, 2018:
I have the same problem, especially if i eat something with melted cheese on empty stomach. This is the first time I found out there are other people with the same problem. I have also the same problem with digestion of fructose. And I also have celiac. Oh well...
Camille on December 12, 2018:
I have noticed a trend with my feeling sick after eating melted cheese, and today ate a homemade pizza with melted cheese and immediately got severe stomach cramping and bloating. I thought I was the only one, as I have never heard someone else mention this type of thing before so I searched online to see and came across this. Thanks for sharing!
Paul on November 20, 2018:
For the past two years i have experienced intermittent diarrhoea and sickness, and have had great difficulty in identifying the culprit. It now appears I have developed some kind of intolerance to melted cheese, also, which I never believed could be the issue because I can eat regular (non-melted) cheese without problems.
I'm not sure why I seem to have developed this problem later in life (I am 54) but it's interesting to know I'm not alone in what, in isolation, appears to be a rather bizarre situation. Thank you for sharing your story.
Jess on November 10, 2018:
For me it was even weirder!! I do eat cheese and melted cheese and always been fine. But all the sudden one day i have added some extra mature cheese on pasta which melted. I have got an allergic reaction but it was immediate after eating! It did not affect my stomach but all my body became ready , really hot, itchy and burning. My hands and feet started to swell! It lasted for lets say half an hour than all desappeared! The day before i had the same things to eat just the cheese was raw. So found it quite weird this sudden allergy reaction!!
Nikki on November 04, 2018:
I have a similar issue, within an hour of consuming even a small slice of pizza or some pasta, I get a horrible stomach ache and I am surely not lactose intolerant cause I drink milk, yoghurt etc. If this is really a thing, I guess I too have this weird issue.
Robert S Matthews on October 19, 2018:
You can test the lactose intolerance theory by buying lactase pills and taking them before consumption of the melted cheese. Not only does that work for me, it proves the theory.
Marguerite Oliver on September 25, 2018:
I cannot eat melted cheese especially Macaroni cheese or any cheese sauces. An hour after I get stomach cramps and diarrhoea. Not pleasant. I now stay away from all cheese hard or soft. So pleased with this report. Thought I was just weird!
Crystal on September 23, 2018:
I have the same problem! Last night esp hence while I’m googling again. I was in tears last night after eating pizza...melted cheese always gets me but usually not as bad as last night. My stomach Pain was horrible.
Sandra on September 16, 2018:
I also have the same problem of getting sick after eating pizza and grilled cheese. I also have a similar problem (milder version) when i drink a warm milk and latte.
Andrew on September 06, 2018:
I have the same issue with hot dairy (so melted cheese and hot coffee/hot chocolate). It gives me diarrhea and hurts my stomach but it does not make me vomit.
Gayle on August 30, 2018:
My aunt has a similar condition with melted butter. Regular butter, no problem, but If she eats clarified butter, she gets really sick.
Michelle McFarlane on August 11, 2018:
I have the same, and like Sara, differing levels. I can eat a gluten free lasagna with a just little melted cheese and only be a bit gassy - but if I were to have a standard lasagna with the same small amount of melted cheese I would be in agony.
Which is really cruel since my favourite foods were pizza and mac n cheese!
I only developed this after I turned 40 and developed erosive duodenitis (so a gut problem anyway) and again, can munch my way through cheeses on a cheeseboard, but as soon as heat is applied, it is a no no.
I was also told it is the chemical reaction to heat/enzymes and simply tell people I have an adverse reaction to cooked cheese.
Megan on August 07, 2018:
I have the same issue with melted cheese with certain foods but any other dairy no issues including non melted cheese. It’s odd because I can eat pizza and cheeseburgers just fine but an enchilada or melted cheese in a bowl will make me sick. Within the hour I get terrible cramps which sometimes feels like labor pain and explosive bowels. I have found ways to manage such as OTC lactose pill before I eat it or add lettuce to my enchilada. I have mentioned this to my Doctor and friends and they think I am nuts. I too wish there was an explanation. Thank you for spreading light on this topic!
habsb on July 06, 2018:
I've had the same allergy for all my life
I can eat (and i'm fond of) cheese, but as far as it's not cooked or melted
For instance, there are some creamy sorts of cheese, having naturally the same consistency of melted/cooked cheese, but I've no issue with them.
So my problem is clearly in the heating of cheese.
I avoid completely such kind of food e.g. pizzas, fondues, some meat recipes using cheese. It's not so hard after all.
Sara on May 26, 2018:
Hi, I found this article when I searched for why does melted cheese make me sick and regular cheese does not. I'm so glad I'm not alone. My husband thinks it's in my head. I have been thinking it was gluten or beef because I can eat an apple and cold unmelted cheddar and enjoy the heck out of it, but I can *feel something different if it's melted. There were times in school where the cheese in my bag didn't quite melt but began the separation where that oily stuff starts to ooze out of the cheese andI was okay. As an aside, I also find that for me if the melted cheese is with any sort of wheat it's worse. A hamburger on a bun is fine. A cheeseburger on a plate is less fine. A cheeseburger on a bun is bad. I think for me it's a combination of things, one of which is the melty bit and the other is the wheat/cheese combo. Man that sucks. But at least apples and gouda are still okay. Why? I may never know lol
Kapil on May 23, 2018:
My 4 year old has this allergy too, she starts sneezing and suffers from cold and running nose whenever she has melted cheese. We realized it today while eating quiche. Thanks for the post.
Diane on April 22, 2018:
I think I have the same issue. I get bad cramps right after eating something with melted cheese. The only way to stop the cramping is to force myself to vomit. I know that is bad but it helps. What else can I do to stop or relieve the cramping. I also have no problem with kefir, cottage cheese, yogurt and small amounts of milk. Thanks so much.
Kelly on April 01, 2018:
I have been trying to figure out what is going on with me. Pizza always seems to keep me up all night with a fast heartbeat and slightly sick stomach. Grilled cheese toasties send me running to the toilet, hoping I make it there in time. And a few weeks ago I made nachos with a melty-cheese sauce and it gave me diarrhea. The common denominator seems to be the melted cheese.
Juhani on March 27, 2018:
I get nausea from melted cheese and very fatty or oily foods.
It's the kind of nausea where you feel like you're about to burb but you can't and it feels awful. Haven't eaten a lot of pizza during past few years because of it. :(
Jaffrey on March 26, 2018:
Ok- I love that you posted this- no one believes me- I am 65 years old- and have had this my whole life- grilled cheese - tastes great- and I am so sick after just a couple bites- same with warm pizza- but cold pizza - I can handle- don’t feel sick but just feel in comfortable after and my body swells a little- so I know it does not agree with me- as a kid- I lived in Switzerland- and they have Raclette- it is a special cheese that is melted- scraped onto a plate- served with boiled potatoes and pickles and onions- a cultural tradition- and delicious - I might add- and delicious- always done in a group and a traditional way- and I am so sick- nauseous- - my friends don’t believe me- they think it is weird and judge me in disbelief-
I so understand you- and I wish there could be some enlightenment - that it is real - and not just a figment of my imagination—— we are talking decades of me - feeling this way- and I just avoid melted cheese on any thing- not that it doesn’t taste good—- it just makes me- literally— sick—
Thank you- thank you- thank you!!!! I feel better just for reading this!!
Shania on February 10, 2018:
I’ve been to countless specialists including 2 surgeons , and a gyno . I’ve had 4 untrasounds , 3 X-rays , an mri and a CT scan and dozens of rounds of blood work . No one ever found anything out . I’ve been on pills upon pills for pain . Even a misdiagnose of IBS . Staying away from melted or cooked cheese and I’m fine but soon as I have it , I keel over in abdominal pain . You’re not alone
Claire on February 10, 2018:
I'm sitting on the loo having eaten cauliflower cheese an hour ago, wondering when this will stop! So glad I'm not alone. I have this problem with a lot of rich food, and avoid creamy sauces, too.
Rell on February 05, 2018:
I have had this problem for about 10 years but I don’t get sick right away I get sick the next day. It has to do with what the teacher said cheese changes when you cook it and you ate what I’m assuming was fresh soup they make it with fresh cheese. It does most likely become harder to digest. I suffer froma digestive problem now for the past 2 years. There was a lot of things I had to stop eating. It is really something I just live with if I eat the cheese I know what is going to happen.
Marissa on February 02, 2018:
My daughter Kaydence has this issue. It started probably about 8 months ago or so. I have found this article extremely helpful we are another step closer to figuring out what is wrong with her! Just as you described she has no issue until the cheese is melted, then she’s sick to her stomach for hours. Thank you so much for sharing your story with us!
Airion on January 18, 2018:
I am reading this article on the toilet after eating a cheese toastie for lunch. It’s my fourth visit and I’ve been in here for twenty minutes. I figured out that melted cheese upset my stomach a few years back and I now avoid it. I just bought a sandwich toaster and thought ‘Oh, I haven’t had a cheese toastie for ages’ and now I remember why! I’ve also been told that cooking changes the make-up of the cheese, but I don’t know why it makes us sick.
Stormy on January 07, 2018:
I have the same problem. I can eat/drink other dairy stuff but when it comes to melted, pre melted or hot cheese I get so nauseous and sometimes puke. Your physics teacher makes a lot of sense. Thanks for sharing this information!
Summer on December 22, 2017:
I have the same problem, thanks for all your research
Chan07 on December 08, 2017:
Yes! I knew it couldn’t just be me!
I was a picky eater as a child and lived on bread and I think that caused lobg-term damage to my gut. Im now 40 and have developed some terrible problems with wheat, sugar and dairy.
Went dairy free years ago but recently started back on cheese and yoghurt to try and heal my gut. Can eat cheese, icecream, cream with only minor cramps but melted or cooked, im on the toilet for hours. But fristratingly, it’s not all types of cheese and it’s not every time! I have to start keeping a food diary again!!! Arregh so boring
I’ve been reading all the responses in the hope of solving the riddle- type of cheese? Temperature? Mixture of other foods? Empty or full stomache? Still dont know.
Jeannie on November 27, 2017:
For nearly 3 years I have suffered from a swollen tongue. It can be weeks or months between times. After having some allergy tests, blaming stress etc. I now think this could be due to eating cooked cheese. Please please has anybody else had these symptoms.
vik707 on November 20, 2017:
I have the same effect: I eat every form of milk without restrictions and without problem.
But if I eat melted cheese, 1-1,5 hour later my digestive system stop to work: it is like a cork in the stomach, in the gut. Nothing going through.
I’m lucky to fall in this situation just 3 times within 37 years.
Last time, today, my wife gave me Coke Cola 6 hours after eat cheese. An hour later i get in life again. Usually i don’t drink Coke.
I‘m not sure it was a solution, but if someone already tried it, please share the results.
Starr on November 15, 2017:
This seems to be the only place that has a possible answer for me, but I don't get physically sick when I eat melted cheese. However it did just occur to me today, when I ate melted cheese in my dinner I had an allergic reaction. Now that I come to think of it, I've eaten cheese several times this week, but it's all been cold/solid and not melted and hasn't caused me any problems.
But when it was melted in my dinner, I got a mild case of the hives and I think the cheese being melted might be the answer. Gonna have to test this theory again.