Mushroom Allergy and Food Intolerance
Mushroom allergy is uncommon but documented, including reactions linked to mold allergy. Symptoms, how intolerance differs from allergy, and when to get emergency help.
Content last updated . This page has not been medically reviewed.
Safety first. Supplements can cause side effects and interact with medicines. Read mushroom safety and interactions before you use any mushroom product.
Get urgent help first
A serious allergic reaction (anaphylaxis) is an emergency. NHS lists these as signs: sudden swelling of the lips, mouth, throat or tongue, fast breathing or struggling to breathe, a tight throat or trouble swallowing, blue, grey or pale skin, sudden confusion or dizziness, and fainting. [1] In the US, call 911. This page is information only and cannot diagnose a reaction. Eating a wild mushroom is a different problem: call Poison Help at 1-800-222-1222 and see plant and mushroom poisoning.Allergy and intolerance are different
A food allergy involves the immune system. NHS lists common symptoms: dizziness, itchy skin or hives, swelling of lips, face and eyes, coughing or wheezing, breathlessness, sneezing or a blocked nose, nausea or vomiting, tummy pain and diarrhea. They may start straight after eating or days later. [1] A food intolerance is not caused by the immune system overreacting, so NHS says it cannot cause a serious allergic reaction. [2] Intolerance symptoms such as bloating and tummy pain usually come a few hours after eating. [1]What research shows about mushroom allergy
The evidence is mostly case reports and small studies. We could not find a prevalence figure in the sources we read ("Proper evidence not found"; searched PubMed for mushroom allergy reviews).| Finding | Source and detail | Strength of evidence |
|---|---|---|
| Anaphylaxis after eating button mushroom | A 33-year-old man with dust-mite allergy and asthma had lip and face swelling, breathing trouble and cough minutes after a pizza with Agaricus bisporus. Tests found specific IgE to mushroom and positive skin tests to raw and cooked mushroom. [3] | Single case report |
| Reaction to lightly cooked mushroom linked to mold allergy | A 15-year-old with mold sensitization had throat itch and tightness after mushroom pizza. He tolerated canned mushrooms in a graded challenge, suggesting a heat-labile protein. [4] | Single case report |
| Cross-reactivity between airborne fungi and fungal foods | A review says edible mushrooms can induce "fungus food allergy syndrome" through cross-reactivity with airborne fungi, from oral symptoms to severe anaphylaxis. [5] | Narrative review |
| Airborne exposure at work | Among 72 button mushroom workers, 23.6% had specific IgE against A. bisporus proteins in a lab blot. [6] | Small cross-sectional lab study, workers only |
The first and fourth rows are about Agaricus bisporus (the second row's patient reacted to portobello and cremini, the same species), so they do not transfer to other species. For a food-safety issue specific to enoki, see the enoki guide.
Skin rash from shiitake is not a classic allergy
Shiitake dermatitis is a streaky itchy rash after raw or undercooked shiitake. It is thought to involve heat-labile lentinan, and the French poison-center authors suggest a partly toxic or Th1-type hypersensitivity mechanism rather than the typical immediate allergy. [7] Details are in cooking edible mushrooms safely.Mold allergy, asthma and mushrooms
Several sources describe a possible link between mold sensitization and mushroom reactions. [4] [5] The evidence is limited, and it does not mean everyone with mold allergy reacts to mushrooms. If you have mold allergy or asthma and noticed symptoms after mushrooms, ask an allergist about testing rather than self-testing. See also allergies, asthma and plant product cross-reactions.Supplements and allergy
This page is about food. Mushroom supplements may contain different parts (fruiting body, mycelium, grain) than a meal. We did not read a source showing that a food allergy predicts a reaction to a supplement, or the reverse. Read the label, ask a pharmacist, and see mushroom supplement side effects and allergies.Practical, non-medical steps
- Note which mushroom, how it was cooked and how soon symptoms came.
- Ask your own clinician about allergy testing and where to start.
- Report adverse events: FDA invites reports of illness or serious allergic reaction. [8]
Frequently asked questions
What does a mushroom allergy look like?
Symptoms listed for food allergy in general include hives, swelling, wheezing and stomach upset. [1] Single reports of mushrooms describe lip swelling, breathing trouble and throat itching. [3] [4]
Can I be allergic to mushrooms if I have a mold allergy?
Possibly. A case report and a review describe cross-reactivity between molds and edible mushrooms, but studies are few. [4] [5]
Is mushroom intolerance the same as allergy?
No. NHS says intolerance does not involve the immune system and cannot cause a serious allergic reaction. [2] Proper evidence not found for a specific mushroom intolerance in the sources we read.
Does cooking make mushrooms safe for someone allergic?
Not reliably. One man reacted to both raw and cooked button mushroom on skin testing, while a teenager tolerated canned. [3] [4] Ask an allergist.
When should I call 911?
For swelling of the lips, mouth or throat, trouble breathing or swallowing, fainting, or sudden confusion. [1]
References
- NHS (UK), Food allergy. Read 2026-10-22.
- NHS (UK), Food intolerance. Read 2026-10-22.
- Cunha IM, et al. Anaphylaxis to Agaricus bisporus ingestion. Einstein (Sao Paulo) 2020. Read 2026-10-22.
- Gauld R, et al. Pollen food allergy syndrome secondary to molds and raw mushroom cross-reactivity: a case report. Allergy Asthma Clin Immunol 2024. Read 2026-10-22.
- Xing H, et al. Recent Advances in the Allergic Cross-Reactivity between Fungi and Foods. J Immunol Res 2022. Read 2026-10-22.
- Khakzad Z, et al. Serum IgE and IgG reactivity to Agaricus bisporus proteins in mushroom cultivation workers. Curr Med Mycol 2015. Read 2026-10-22.
- Boels D, et al. Shiitake dermatitis: experience of the Poison Control Centre Network in France from 2014 to 2019. Clin Toxicol 2022. Read 2026-10-22.
- U.S. Food and Drug Administration, Outbreak Investigation of Listeria monocytogenes: Enoki Mushrooms (November 2022). Read 2026-10-22.