Endometriosis and Allergies: Is There a Connection?
Pelvic pain, fatigue—and now itchy eyes or another skin reaction? When you already live with endometriosis, managing an additional set of symptoms can feel exhausting. It is understandable to wonder whether they are connected.
Researchers have explored the overlap between endometriosis and allergic conditions. There are interesting findings, but also important gaps. You deserve information that takes your symptoms seriously without promising more than the science can tell us.
Are allergies more common with endometriosis?
Some studies suggest they may be. A 2014 systematic review found that four of five included studies reported an association between endometriosis and allergic symptoms or diagnoses. However, the studies used different definitions, and the authors said better research was needed. [1]
A 2025 study using UK health records compared 8,299 people with endometriosis with matched controls. It also found allergic disorders were more common in the endometriosis group. This was an observational study: it can identify patterns, but cannot show that endometriosis caused the allergies. [2]
Having both conditions does not mean every new symptom comes from endometriosis. An association also does not mean everyone with endo will develop allergies.
Food allergy, intolerance and “endo belly” are different
A food allergy involves the immune system and can cause symptoms such as hives, swelling, wheezing or vomiting. Some reactions can be life-threatening. Food intolerance, such as difficulty digesting lactose, works differently and is not a food allergy. [4]
Endometriosis can also come with digestive symptoms. Bloating, abdominal pain or changes in bowel habits do not, by themselves, prove a food allergy. A 2021 review found the available studies were too limited to establish that food allergy or intolerance is more common in people with endometriosis. That uncertainty does not make your symptoms any less real. [3]
If food seems to trigger symptoms, ask for an assessment rather than assuming you need to stop eating several food groups. If changes are needed, a registered dietitian can help you protect your nutrition.
What about histamine and mast cells?
Histamine is one of the chemical messengers involved in allergic reactions. You may also come across discussions of mast cell activation syndrome, or MCAS. This is a separate condition with specific diagnostic criteria; endometriosis, bloating or fatigue alone cannot establish the diagnosis. A clinician must assess the pattern of episodes and appropriate testing. [4][5]
This article is not a recommendation to start a low-histamine diet, supplements or allergy medicines as an endometriosis treatment. If you are considering a change, discuss your symptoms and current medicines with your healthcare professional or pharmacist.
A few useful notes can help at your appointment
You do not need to investigate everything at once. Start with the symptoms that trouble you most and record a few details when you can:
What happened: for example, itching, a rash, a blocked nose, swelling or digestive discomfort.
When it started, how long it lasted and any possible exposure, food or new medicine.
Whether it happened more than once, and what helped or made it worse.
Where you were in your cycle, if you notice a pattern. Timing is a clue to discuss, not proof of the cause.
Photos of visible reactions and a list of medicines and supplements can be useful. Bring your notes to a family doctor or nurse practitioner and ask whether allergy assessment is appropriate. Do not deliberately retry something that may have caused an allergic reaction to test your theory. [4]
Ask about the right tests
Allergy testing should be guided by your symptoms and history. A positive test alone does not always mean a true allergy. Commercial IgG “food sensitivity” tests are not recommended for diagnosing food allergy or intolerance, and can lead to unnecessary food restrictions. [7]
Questions you can bring:
Could these symptoms be allergy, intolerance, a medicine reaction or another condition?
Would an allergist referral or targeted testing help?
How can I manage these symptoms alongside my endometriosis care?
If I am at risk of a severe reaction, what emergency plan should I follow?
Know when a reaction is an emergency
Trouble breathing, throat or tongue swelling, or faintness/collapse during a suspected allergic reaction can be signs of anaphylaxis. Use your prescribed epinephrine immediately and call 9-1-1. Seek emergency care even if you improve. Antihistamines do not replace epinephrine for anaphylaxis. [6]
Your whole health deserves attention
Living with endometriosis should not mean having every other symptom brushed aside. Whether your allergies are related, separate or still being investigated, you deserve support for both.
Use our Symptom Tracker to organise your endometriosis symptoms, and keep allergy details in your appointment notes. Our appointment-preparation guide can help you plan the conversation.
This article provides general education and does not diagnose allergies or replace individual medical advice. Research checked October 24, 2026.
Sources and further reading
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