Cooking Edible Mushrooms Safely: Why Some Must Be Cooked
Can you eat mushrooms raw? What food-safety agencies and researchers report about enoki and shiitake, why cooking matters for some people, and where the sources are silent.
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.
If you ate a wild mushroom, or are unsure what a mushroom was, call Poison Help at 1-800-222-1222 (US) right away and do not wait for symptoms. For collapse, seizure or severe vomiting with confusion, call 911. See plant and mushroom poisoning and mushroom poisoning: warning signs and urgent help.
Shiitake: undercooked shiitake and a skin rash
Shiitake can cause a distinctive rash called flagellate dermatitis (linear, whip-mark-like itchy streaks). A French poison-center review of 59 cases found the rash appeared after raw or undercooked shiitake, such as from a wok, in soup or on pizza. [3] The rash appeared a median of 48 hours after eating, lasted a median of 10 days, and all patients recovered fully. [3]The mechanism is thought to involve lentinan, a heat-labile (broken down by heat) polysaccharide, and the authors concluded that inadequate cooking seems to be a driver. [3] A 2026 case report of a 25-year-old man tied the rash to undercooked shiitake and noted that severe reactions after repeated exposure have been described. [4] Another 2026 report describes a case linked to mushroom coffee, so the form may matter as well as the cooking. [5]
This is a rare reaction in the evidence we read, not a reason to avoid shiitake. For how lentinan is studied as an extract, see shiitake, lentinan and immune research.
What the sources do not tell us
| Question | What we found | Evidence |
|---|---|---|
| Are raw white button, cremini or portobello mushrooms unsafe? | Proper evidence not found. We searched PubMed for raw Agaricus bisporus and cooking, and FoodSafety.gov could not be read (HTTP 403). | Not established either way |
| Does cooking change nutrients? | One scoping review says bioactive compound amounts vary with mushroom type, cooking method and duration. [6] | Limited, varies by compound |
| Does cooking affect allergy? | Mixed. Some people react after cooked mushrooms; one case tolerated canned but not lightly cooked. [7] [8] | Case reports only |
"Not described in the sources we read" does not mean "proven safe." If you have a reason for caution (pregnancy, weak immune system, age 65 or older, a past reaction), ask a clinician or pharmacist.
Who should take extra care
- Pregnancy, age 65 or older, weakened immune system: the enoki advice above is aimed at you. [1] NHS information describes people who are pregnant, newborns, people with weakened immunity and older people as higher risk for serious listeriosis. [9]
- Anyone with a past mushroom reaction: see mushroom allergy and food intolerance.
- People taking medicines: food mushrooms are not the same as supplements; see mushroom supplement and medicine interactions for the supplement side.
For nutrition values, see mushroom nutrition.
Frequently asked questions
Can you eat raw mushrooms?
For enoki, US agencies advise avoiding them raw. [1] For shiitake, raw or undercooked servings were behind the rash cases reviewed in France. [3] For other cultivated mushrooms, we did not find a source we could read and cite, so we cannot say more.
Why do health agencies single out enoki?
Enoki have been linked to Listeria outbreaks and many recalls since 2020. [1] Lab testing found Listeria numbers could rise during refrigerated storage of fresh enoki. [10]
What is shiitake dermatitis?
It is an itchy, streaky rash that can appear a day or two after eating raw or undercooked shiitake. In one French series it lasted a median of 10 days and everyone recovered. [3] A clinician can diagnose it.
Does cooking remove every risk?
No. Cooking does not help allergy in everyone, since some people react to cooked mushrooms. [7] Cooking also does nothing for wild mushrooms that are poisonous.
What should I do if I feel unwell after a mushroom meal?
Contact a clinician for fever, aches or illness, especially if pregnant, 65 or older, or immunocompromised. For trouble breathing, swelling of the face or throat, or collapse, call 911. For a suspected wild mushroom, call Poison Help at 1-800-222-1222.
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
Enoki: cook thoroughly, especially for higher-risk groups
The reason is Listeria monocytogenes, a bacterium. FDA states that more than 20 enoki recalls for possible Listeria contamination have occurred since 2020. [1] A review by FDA and CDC authors describes enoki as commonly used in soups, stir-fries, hotpots and salads, and says imported enoki have been linked to a series of listeriosis outbreaks and recalls. [2] More on recalls and storage: storing mushrooms and food safety and the enoki mushroom guide.
References
- U.S. Food and Drug Administration, Outbreak Investigation of Listeria monocytogenes: Enoki Mushrooms (November 2022). Read 2026-10-22.
- Viazis S, et al. An Overview of Listeriosis Outbreak Investigations in the United States Linked to Imported Enoki Mushrooms. Compr Rev Food Sci Food Saf 2025. 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.
- Nette D, et al. Flagellate Dermatitis Induced by Shiitake Mushrooms: Clinical Features of a Rare but Characteristic Entity. Diagnostics 2026. Read 2026-10-22.
- Mijares J, Ramachandran V. Flagellate Erythema From Mushroom Coffee: A Novel Exposure Route for Shiitake Dermatitis. Int J Dermatol 2026 (title and record only; no abstract available). Read 2026-10-22.
- Blumfield M, et al. Examining the health effects and bioactive components in Agaricus bisporus mushrooms: a scoping review. J Nutr Biochem 2020. 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.
- NHS (UK), Listeriosis. Read 2026-10-22.
- Upham JP, Markell JA. Challenge Testing to Determine Growth of Listeria monocytogenes on Fresh Enoki Mushrooms at 4 °C and 10 °C Storage Temperatures. J Food Prot 2025. Read 2026-10-22.