Yes, certain mushrooms can make you sweat, sometimes significantly. The cause depends entirely on the type of mushroom. Some wild species contain a toxin called muscarine that directly activates sweat glands, producing drenching sweats within minutes of ingestion. Psilocybin (“magic”) mushrooms can also trigger sweating as part of their effects on the nervous system. And one group of mushrooms causes sweating only when combined with alcohol.
Muscarine Poisoning: The Most Common Cause
The clearest link between mushrooms and sweating comes from species that contain muscarine, a toxin found primarily in certain Clitocybe (funnel cap) and Inocybe (fiber cap) mushrooms, along with some Mycena and Entoloma species. These are wild mushrooms that foragers sometimes mistake for edible varieties.
Muscarine locks onto the same receptors your nervous system uses to control involuntary functions like salivation, tear production, and sweating. It essentially floods your parasympathetic nervous system, the branch responsible for “rest and digest” activities, and forces those functions into overdrive. The result is profuse sweating alongside a cluster of other symptoms: heavy salivation, watery eyes, abdominal cramps, nausea, vomiting, diarrhea, and sometimes wheezing or a slow heart rate.
Symptoms typically begin within 15 to 30 minutes of eating the mushroom and are usually mild, resolving on their own within 12 hours. In more severe cases, medical treatment involves medications that block the same receptors muscarine activates, essentially shutting off the signal. Interestingly, the famous red-and-white Amanita muscaria (fly agaric) was the mushroom muscarine was originally named after, but it actually contains too little of the toxin to cause this sweating syndrome in most cases.
Psilocybin Mushrooms and Sweating
People who use psilocybin mushrooms frequently report sweating during the experience, particularly during the “come up” phase in the first 30 to 60 minutes. Psilocybin activates serotonin receptors throughout the brain and body, and serotonin plays a role in regulating body temperature. The result can be fluctuations between feeling hot and sweaty and feeling chilled, sometimes alternating within the same session.
This sweating is generally mild to moderate and not dangerous on its own. It’s part of a broader set of physical effects that can include nausea, dilated pupils, increased heart rate, and changes in body temperature perception. The sweating typically fades as the acute effects plateau and is rarely the primary concern for users compared to the psychological intensity of the experience.
The Alcohol-Mushroom Reaction
One particularly surprising cause of mushroom-related sweating involves alcohol. Coprinopsis atramentaria, commonly called the “inky cap,” contains a compound called coprine that blocks your body’s ability to break down alcohol completely. Normally, your liver converts alcohol into acetaldehyde and then quickly clears it. Coprine stops that second step, causing acetaldehyde to build up in your bloodstream.
If you drink alcohol within 48 hours of eating these mushrooms (before or after), you can experience facial flushing, a pounding headache, rapid heartbeat, shortness of breath, and sweating, all within minutes of your first drink. The reaction is essentially identical to what happens when people on the medication disulfiram (used to treat alcohol dependence) have a drink. Symptoms typically fade within a few hours but can be triggered again by any alcohol consumption for up to two days after eating the mushroom. At least one other species, Lepiota aspera (the freckled dapperling), produces the same syndrome.
Edible Mushrooms and Sweating
Common grocery store mushrooms like button, cremini, portobello, and oyster mushrooms do not cause sweating. They contain no muscarine, psilocybin, or coprine.
Shiitake mushrooms are a partial exception, not for sweating specifically, but for causing unusual reactions. Undercooked or raw shiitake can trigger a distinctive skin rash with linear, whip-like marks on the trunk and limbs. About 5% of people who develop this rash also experience systemic symptoms like fever, diarrhea, or swelling. Sweating is not a hallmark of shiitake reactions, but fever-related sweating is possible in that small subset.
How to Tell if Sweating Is a Warning Sign
Context matters more than the sweating itself. If you’ve eaten foraged or wild mushrooms and begin sweating within two hours, pay close attention to what else is happening. Sweating combined with heavy salivation, tearing eyes, cramping, and diarrhea points to muscarine poisoning. This combination is distinctive enough that toxicologists use it as a diagnostic pattern. While most cases resolve without lasting harm, the concern is that early symptoms of more dangerous mushroom poisonings (particularly from Amanita phalloides, the “death cap”) can overlap with milder syndromes in the first few hours.
A key distinction: muscarine poisoning causes constricted pupils and excess fluid production everywhere (tears, saliva, sweat, bronchial secretions). Some other toxic mushrooms cause the opposite, dilated pupils and dry skin. If you or someone else has eaten a wild mushroom and is sweating heavily with other symptoms, bring a sample or photo of the mushroom if possible. That single detail can dramatically speed up identification and treatment.
Sweating from psilocybin mushrooms or from the alcohol-inky cap interaction, while uncomfortable, is not typically a sign of a medical emergency on its own. The risk profile of those situations comes from other factors: psychological distress with psilocybin, or cardiovascular stress from the acetaldehyde buildup with the alcohol reaction.