Mushroom Safety: Poisonous Species and First Aid

Most serious mushroom poisonings start with a confident but wrong name. The worst toxins then stay quiet for hours after the meal. These pages cover what to do after a suspected bite and how the main poisonings differ. They also answer the separate questions about raw mushrooms, pets and pregnancy.

What should you do if someone eats a wild mushroom?

In the United States, call Poison Control at 1-800-222-1222 as soon as you suspect someone ate a wild mushroom. Call 911 instead if the person collapses, has a seizure, has trouble breathing or cannot be woken.

You do not need a species name or any symptoms before you call. Poison Control asks for age, weight, the amount eaten, the time of the meal and any symptoms so far. Outside the United States, call your local poison center or emergency service. Save that number before a foraging trip, because services and phone numbers differ by country.

Keep any leftover pieces once the call has started. North Carolina Poison Control says to store them in a labeled paper bag in the fridge so nobody eats them. Do not make the person vomit unless a poison specialist or doctor tells you to, as MedlinePlus first aid also says. The first-aid response covers the call, the evidence to keep and the home remedies that cause harm.

Hospitals have no single antidote for mushroom poisoning. StatPearls describes treatment as mainly supportive, so hospital care protects breathing and blood flow while staff repeat liver and kidney tests.

Why the time before symptoms matters

The time between the meal and the first symptom guides doctors, but it never clears anyone. Mushroom poisoning symptoms can begin within minutes, hours or days.

Fast stomach upset often comes from an irritant. NAMA describes the usual pattern as nausea, vomiting, cramps and diarrhea about 20 minutes to 4 hours after eating. Even this milder kind of gastrointestinal poisoning can need hospital care when a person loses a lot of fluid. Quick vomiting also cannot rule out a second toxin, because one dish may hold several wild species on different clocks.

Late symptoms are the bigger warning. Amatoxin poisoning often begins with stomach pain, vomiting and diarrhea more than 6 hours after the meal. In the 2025 to 2026 northern California outbreak, people poisoned by western destroying angels fell ill 8 to 12 hours after eating. Among 39 suspected amatoxin cases, three people needed liver transplants and four died.

The stomach symptoms can ease while the liver damage goes on. That false recovery is why feeling better a day later does not end the need for care.

Sweating and drooling point to a different poison. Muscarine poisoning brings sweating, small pupils, vomiting and diarrhea. A 2023 case report names Inocybe and Clitocybe species as the most common sources of muscarine. Its two patients recovered within three days on supportive care.

Kidney poisons can wait the longest. For one deadly webcap, Norway's poison center gives a usual onset of 36 hours to six days. Signs of kidney failure then build over three to 17 days. Orellanine poisoning is easy to miss, because the person may have forgotten the meal by then.

Which mushrooms cause the most serious poisonings?

Poisonous and deadly are different labels. Many poisonous mushrooms cause stomach illness that passes, while the deadly species can cause fatal harm to the liver, kidneys or nerves.

Amatoxins cause most mushroom deaths. The death cap and the destroying angels carry them. California's public health department warns that cooking does not destroy these toxins. Australia's death cap guide adds that soaking, cooking and drying do not remove its poisons.

Size gives no protection. Deadly Galerina is a small brown mushroom with the same toxins, and a UBC museum guide notes that heat does not break them down.

Some false morels carry gyromitrin, which can cause seizures and liver injury. Researchers reviewing mushroom toxins describe people breathing it in, so steam from the pan can harm the cook.

Telling a true morel from a false one starts with a lengthwise cut. True morels are hollow from tip to stem, while common false morels hold folded or cottony tissue. The cut lets you reject a false morel. It does not make every hollow, morel-like mushroom safe to eat.

Poisons with an unusual trigger

Some reactions depend on what happens around the meal, such as a drink or a later serving. People misread these cases, because the same person may have eaten the same species before without trouble. The common inkcap is the clearest example. Alcohol sets off its coprine reaction, and research on coprine describes it as alcohol intolerance after the meal.

Brown roll-rim can cause Paxillus syndrome, in which red blood cells break down after a later meal. Doctors have described this poisoning in a case report, so safe meals in the past prove nothing about the next one.

Case reports link repeated large meals of yellow knight with severe muscle breakdown, as one case series records. The link is still disputed. A 2018 Polish study surveyed 1,545 foragers. It found no case of this muscle breakdown in Polish poisoning records from the ten years before.

The fly agaric acts on the brain. Muscimol and ibotenic acid can swing a person between agitation and deep sleepiness. A 34-case poison-center series lists airway support among the treatments. Anyone who cannot stay awake needs emergency care.

Psilocybin effects add a legal question, since psilocybin is a Schedule I drug under U.S. federal law. Seizures, breathing trouble or passing out after any mushroom still call for emergency help.

Can you eat mushrooms raw?

Do not eat wild mushrooms raw. France's food safety agency and its poison centers advise cooking wild mushrooms well. Cooking still cannot rescue a wrong pick. NSW Health states that no preparation makes a poisonous wild mushroom safe.

Morels show what raw service can cost. A Montana restaurant outbreak in 2023 caused 51 illnesses, three hospital stays and two deaths. The link was raw or undercooked morels. Thorough cooking lowers the risk, but FDA's morel investigation does not treat it as a guarantee.

Edible on a list does not mean safe raw. In porcini, one study found that a protein called Edulitin 2 resisted digestion in the lab. No source sets a safe portion of raw porcini. The same gap shows up across other boletes.

Bay bolete counts as edible, yet a Nordic food review found that eating records do not prove a safe raw serving. Blue bruising cannot settle it either, as the Boletus huronensis account shows. Brown birch bolete is on Vienna's list of edible mushrooms. That list covers food use, and no source on record tests it raw or gives a tested cooking time.

For several species, the real danger is the lookalike. The green-spored parasol is the most often eaten poisonous mushroom in North America. Eaten raw, it causes severe symptoms, including bloody stools within a couple of hours. So check the spore print before anyone tries a parasol mushroom raw, and stop if it is green.

The fairy ring champignon releases cyanide-forming compounds when you tear or chew its flesh. Cooking and drying destroy them. The bigger risk is the fool's funnel, which grows in the same lawn rings. It carries potentially deadly levels of muscarine, with symptoms 15 to 30 minutes after eating.

Matsutake is one of the few wild mushrooms eaten raw on purpose, sliced for sashimi in Japan. That makes raw matsutake a test of naming it right. Its lookalike, Amanita smithiana, causes kidney failure. Gut symptoms start 4 to 11 hours after the meal, and the kidney damage follows later.

The ring on a gypsy mushroom cannot confirm its name. A UBC museum guide notes that it looks like ring-bearing death caps. Horse mushroom also needs cooking. A Nordic food report records cadmium controls for it, and cooking cannot show how much cadmium a wild one holds.

Winter finds carry the Galerina problem. Velvet shank survives frost, as the Woodland Trust notes, and Missouri records show deadly Galerina coming up through snow. Missouri's conservation agency warns against eating wild velvet foot at all because of that mix-up. White spores support the name, but they do not make raw velvet shank safe to eat.

Honey fungus is unsafe raw or undercooked. Norway's poison center does not recommend the group as food, because its toxins are unknown and people can react even after cooking.

Young, tender beefsteak polypore is one of the rare raw exceptions. A Piedmont edibility guide records raw use without reported harm. Even here, a poisoning report shows the cost of picking the toxic Hapalopilus rutilans by mistake. The raw exception holds only for a mushroom named with certainty.

Shop mushrooms raise a different question. For fresh cremini, the raw choice turns on washing, bacteria and the agaritine levels that researchers measured in fresh and cooked button mushrooms.

Dogs, cats and other pets

Any pet that eats a wild mushroom needs a vet call, not a home remedy. The ASPCA generally considers grocery mushrooms sold for people safe for pets, but a wild one is an exposure. Feeding your dog mushrooms is a separate question from an accident on a walk. Onion and garlic make even a grocery mushroom dish unsafe, because WSAVA lists both as toxic to dogs.

If a pet eats an unknown mushroom, call your vet, an emergency vet hospital or ASPCA Animal Poison Control at 888-426-4435. Pet Poison Helpline answers at 855-764-7661, and both may charge a fee. Do not make a pet vomit unless a veterinary professional directs it. The ASPCA's poisoning advice leaves that choice to the vet.

When a dog eats a mushroom, the first steps are moving it away from the patch and calling. Dogs can look normal for hours before a death cap causes vomiting and liver failure. The MSD Veterinary Manual treats signs that start more than 6 hours after eating as a mark of deadly species. For amanitins, that gap is 6 to 24 hours.

Cats need extra care with home treatments. Hydrogen peroxide is unsafe for cats, so treatment choices for cats that ate a mushroom stay with the vet or animal poison service.

Mushrooms in pregnancy

Store-bought mushrooms cooked all the way through are an ordinary food in pregnancy. CDC's list of riskier foods for pregnant people does not name them. The pregnancy guide to mushroom types sets out the exceptions. Raw enoki is the one with harm on record.

A 2020 Listeria outbreak linked to enoki made 36 people ill. Two of its six pregnancy-related cases ended in fetal loss. After a second outbreak, CDC advised that pregnant people should not eat raw enoki. Everyone should cook enoki well before eating it.

Verified true morels in pregnancy need thorough cooking for the same reasons as the restaurant outbreak above. Raw or undercooked shiitake in pregnancy can cause an intensely itchy, streaky rash called flagellate dermatitis.

Mushroom supplements are a separate matter from meals. MotherToBaby notes that researchers have not studied many herbal products in pregnancy, and that gap covers lion's mane and reishi capsules. FDA does not approve dietary supplements before sale. Show your prenatal clinician the actual product label before you start one.

After a doubtful wild mushroom meal, call Poison Control right away and say that you are pregnant. The pregnancy changes the care plan from the first call.

Where to start before you forage

Start with the dangerous lookalikes, because almost every serious case begins with a confident but wrong identification. The deadly lookalike pairs show which edible species have a toxic twin and how to tell them apart. Skill in one place does not carry over to another. Poison Control warns that identification skills learned in one region are not reliable in another.

Some people in the California outbreak above had picked similar mushrooms in other countries. Their memory of a safe mushroom from home did not protect them. The foraging safety rules set the habits that keep a mistake out of the pan. Keep uncertain finds out of every meal, and keep each collection separate so one error cannot spread through the basket.