What Do Psilocybin Mushrooms Do to Your Stomach

Psilocybin mushrooms are a type of fungus that contains a chemical called psilocybin. When a person takes them, the body changes that chemical into another substance that affects the brain, and that is why people experience strange thoughts, changed senses and a different sense of time. But the brain is not the only part of the body that reacts. For many people, the stomach reacts first, and it reacts strongly. Nausea is one of the most common effects, and it can start before the mind effects even begin. Some people feel sick within half an hour. Others feel a heavy, uneasy feeling in the stomach that stays for hours. A few feel fine at first and then become ill later, when the effects are at their strongest.

This article is about the stomach, not about the mind effects that people usually talk about. It explains why psilocybin mushrooms upset the stomach, what nausea, cramps and bloating feel like, how digestion can slow down, and why appetite often disappears for a day or more. It also explains when stomach problems are a sign that a person needs medical help, and why some people are at greater risk than others. This is general information only. It is not personal medical advice. If you are worried about your health, or about someone else, a qualified health professional is the right person to talk to.

What Psilocybin Mushrooms Are

Psilocybin mushrooms grow in nature, and they have been used for a long time in some cultures in religious or ceremonial settings. In most countries today they are illegal, and health agencies do not regard them as safe. The mushrooms contain psilocybin, and after they are eaten the body turns it into psilocin. Psilocin acts on the brain, mainly on the system that uses a chemical messenger called serotonin. Serotonin helps to control mood, sleep and the senses, and that is why changing it can change how a person sees, hears and thinks.

Serotonin is not only found in the brain. In fact, most of the serotonin in the body is found in the gut, where it helps to control the movement of food through the digestive system. The gut has its own large network of nerves, and scientists sometimes call it the second brain because it works closely with the brain and can react to the same chemicals. When psilocin reaches the gut, it disturbs this system. The stomach and intestines do not know how to handle the sudden change, and they respond in the only ways they can: by slowing down, by cramping, by producing acid, or by trying to empty themselves. That is why stomach trouble is so common, and why it is not a rare side effect but one of the most expected ones.

The strength of the mushrooms also varies a great deal. One batch can be much stronger than another, and even mushrooms from the same batch can differ. There is no reliable way for a person to know how strong what they have taken is, or how their own body will react to it. A person who felt only mild nausea the first time may feel much worse the second time. The stomach is also affected by other things: whether the person has eaten, whether they are tired, whether they are anxious, and whether they have taken other substances. All of these things make the reaction harder to predict, and that uncertainty is part of the risk.

Why the Stomach Reacts First

The stomach reacts first because it is the first place the mushrooms land. When they are eaten, they sit in the stomach while the body breaks them down. The stomach lining is sensitive, and the raw mushroom material itself can irritate it. The mushrooms are not smooth, easy food. They are tough, fibrous and hard to digest, and the stomach has to work hard to break them down. For a stomach that is already sensitive, that extra work alone can cause discomfort, even before the chemical effects begin.

Then the chemical effect starts. As psilocin enters the blood, it reaches the nerves in the gut wall. These nerves control the squeezing movements that push food along, a process called peristalsis. When the nerves are disturbed, the rhythm of these movements changes. Sometimes the stomach squeezes too hard and too fast, which causes cramps. Sometimes it slows down or almost stops, which causes a heavy, full feeling and bloating. Sometimes the stomach tries to push its contents upward instead of downward, which is what causes nausea and vomiting. The gut is trying to protect itself, but the result is painful and frightening for the person.

Anxiety makes the reaction worse. Many people feel nervous before taking psilocybin mushrooms, especially if they are unsure what will happen. Anxiety itself affects the stomach: it can increase acid, tighten the muscles of the gut, and make nausea stronger. When anxiety and the chemical effect combine, the stomach can become very unsettled. This is one reason why the same amount can cause mild discomfort in a calm person and severe sickness in a frightened one. The body and the mind are not separate here. What happens in the mind shows up in the stomach, and what happens in the stomach makes the mind feel worse.

Nausea and Vomiting

Nausea is the most widely reported stomach effect of psilocybin mushrooms. Health guidance and research reports describe it as very common, and many people who have taken them say that feeling sick was the first thing they noticed. The nausea often begins within thirty to sixty minutes, while the mushrooms are still being digested. It can feel like a wave that comes and goes, or like a constant sick feeling that does not lift. Some people describe it as seasickness, because the stomach feels unsettled and the body feels off balance at the same time.

Vomiting is also common. For some people it happens once and then the nausea eases, as if the stomach has emptied itself and can settle. For others it happens several times over a few hours, and each time leaves them weaker and more dehydrated. Vomiting brings its own risks. It removes fluid and salts from the body, and if a person cannot keep water down afterwards, they can become dehydrated. Dehydration makes headaches worse, makes the mouth dry, and makes it harder for the body to recover. In a person who is already confused or frightened by the mind effects, vomiting can also be dangerous if they cannot sit up or clear their mouth properly.

It is worth understanding that nausea does not mean the mushrooms are working properly, and vomiting does not mean the body has got rid of the danger. The chemical has already entered the blood by the time vomiting starts, so being sick does not stop the other effects. People sometimes believe that if they vomit, the experience will end sooner, but that is not true. The nausea may ease for a while, but the mind effects can continue for hours. The stomach and the brain recover on different timetables, and the stomach often takes longer to feel normal again.

Cramps, Pain and Bloating

Stomach cramps are another common complaint. They can feel like sharp pains that come in waves, or like a dull ache that sits low in the belly and does not go away. Some people feel the pain in the upper stomach, just below the ribs, where the stomach itself is. Others feel it lower down, where the intestines are working. The pain can be strong enough to make a person double over, or to make it hard to sit still. When the gut muscles squeeze in an irregular way, the pain follows that rhythm, rising and falling every few minutes.

Bloating often comes with the cramps. The stomach feels full and tight, even though the person may not have eaten much. Gas builds up because digestion has slowed down and food is sitting in the gut longer than usual. The belly can look swollen and feel tender to the touch. Clothes can feel tight. Breathing can feel harder because the swollen belly pushes upward against the chest. For some people the bloating lasts only a few hours. For others it lasts into the next day, and eating a normal meal feels impossible.

The pain is not only physical. It changes how a person experiences everything else. When the stomach hurts, it is hard to think clearly, hard to relax, and hard to feel safe. A person who is already feeling strange or frightened because of the mind effects can find the stomach pain overwhelming, and the fear can make the pain feel worse. This is a cycle that is hard to break while the effects are still active. The pain is real, and it deserves to be taken seriously, not dismissed as a minor side effect that will pass quickly. For many people it is the part of the experience they remember most clearly, long after the other effects have faded.

How Digestion Slows Down

Normal digestion is a steady, quiet process. Food moves from the stomach into the small intestine, where nutrients are taken out, and then into the large intestine, where water is absorbed and waste is formed. The whole process depends on regular muscle movements, the right amount of stomach acid, and enzymes that break food down. Psilocybin disturbs all of this. When the gut nerves are affected, the movements become irregular. Food can sit in the stomach for much longer than usual, which makes a person feel full and sick even hours after eating. Or it can move too quickly through the intestines, which can cause loose stools and diarrhoea.

Stomach acid is also affected. Some people produce more acid than usual, and that acid irritates the lining of the stomach and the top of the small intestine. This can cause a burning feeling, often called heartburn, that rises up into the chest and throat. For a person who already has acid reflux or a sensitive stomach, this can be very painful. Others find that their stomach produces less acid, so food is not broken down properly, and they feel heavy and sluggish after eating. Either way, the normal balance is lost, and the stomach cannot do its job in the usual smooth way.

The effects on digestion do not always stop when the mind effects stop. Many people report that their digestion feels wrong for a day or two afterwards. Meals that are normally easy to eat feel heavy. Certain foods, especially fatty or spicy foods, cause discomfort that they would not normally cause. The bowels may be irregular for a few days, swinging between constipation and loose stools. This is because the gut nerves need time to return to their normal rhythm. For most people this settles on its own, but it is a reminder that the gut is not a simple tube. It is a complex system, and once it is disturbed, it can take time to find its balance again.

Eating, Appetite and Weight

Appetite often disappears during the experience and for some time afterwards. A person may feel too sick to eat, or they may simply have no interest in food. The thought of eating can make the nausea worse. Some people go a whole day without eating a proper meal, and they do not notice until the effects have worn off and they realise how hungry and weak they feel. This is not a harmless side effect. The body needs food for energy, and going without it while also losing fluid through vomiting can leave a person tired, shaky and light-headed.

Over a longer period, repeated use can affect weight and nutrition in a more serious way. If a person uses psilocybin mushrooms often, and each time they cannot eat properly for a day or two, they may start to lose weight without meaning to. They may also miss out on the nutrients their body needs, because they are eating less and digesting what they do eat less well. Poor nutrition weakens the immune system, makes it harder to recover from illness, and makes the stomach itself more vulnerable, because the gut lining needs nutrients to repair itself. It becomes a cycle: a weak gut reacts worse to the mushrooms, and the mushrooms make the gut weaker.

There is also the question of what people eat to try to feel better. Some people eat very little before taking mushrooms, hoping that an empty stomach will reduce nausea. Others eat a large meal, hoping it will protect the stomach. Neither approach is reliable. An empty stomach can make nausea worse, because there is nothing to absorb the acid, and the stomach can cramp more strongly. A full stomach can make vomiting more likely and more unpleasant. The truth is that there is no safe way to prepare the stomach for a substance that disturbs it so directly. The only reliable way to avoid the stomach effects is not to take the mushrooms at all.

The Gut and the Brain Are Connected

The link between the gut and the brain is one of the most important parts of this story, and it is often misunderstood. The gut and the brain talk to each other constantly through nerves, hormones and chemical messengers. When the brain is stressed, the gut feels it. When the gut is in pain, the brain feels it. This is why people get stomach aches before an exam, or feel sick with nerves before a difficult conversation. The connection runs in both directions, and it is always active.

Psilocybin mushrooms affect both ends of this connection at the same time. They change how the brain processes feelings and thoughts, and they disturb the nerves in the gut. The result is that a person can feel frightened and sick at the same time, and each feeling makes the other stronger. Fear tightens the stomach. A tight, painful stomach increases fear. The person may feel trapped in their own body, unable to calm either their mind or their stomach. This is very different from ordinary stomach trouble, where the mind is usually clear and the person can think about what to do. Here, the very organ that would normally help a person stay calm is itself affected.

This connection also explains why the stomach effects can linger after the mind effects have ended. The brain may return to normal after several hours, but the gut nerves can stay sensitive for longer. A person may feel anxious about eating, or about feeling sick again, and that anxiety alone can keep the stomach unsettled. It can take a few days for the gut and the brain to settle back into their normal conversation. Understanding this link helps to explain why simple reassurance is not enough, and why a person who has had a bad stomach reaction may feel nervous about their digestion for some time afterwards.

When Stomach Problems Last Longer

For most people, the stomach effects of psilocybin mushrooms last for a few hours and then fade, although the digestion may feel off for a day or two. But for some people, the problems last longer, and that is a sign that something more serious may be happening. If vomiting continues for more than a day, or if a person cannot keep any water down, they are at risk of dehydration, and they need medical help. Signs of dehydration include a very dry mouth, dark urine or very little urine, dizziness when standing up, and confusion. These are not things to wait out at home.

Severe stomach pain that does not ease, or pain that gets worse over time, is also a warning sign. It could mean that the stomach lining has been badly irritated, or that there is another problem that needs to be checked. Blood in vomit or in stools is always a reason to seek urgent medical care. So is a stomach that becomes very swollen and hard, or a fever that comes with stomach pain. These signs do not happen to most people, but they are important to know, because acting early can prevent a serious problem from becoming worse.

Repeated use over weeks or months can also cause longer-lasting stomach trouble. Some people develop ongoing indigestion, regular cramps, or a stomach that feels sensitive to foods it used to handle easily. The gut lining may become inflamed, which means it is red, sore and less able to protect itself. An inflamed gut absorbs nutrients less well and is more likely to react badly to the next dose. If a person notices that their stomach problems are not going away between uses, or that they are getting worse over time, that is a clear signal to stop and to talk to a health professional. The stomach is giving a warning, and ignoring it only makes the damage harder to repair.

Who Should Be Especially Careful

Some people are at greater risk of serious stomach problems from psilocybin mushrooms, and they should be especially careful. People who already have a stomach condition, such as gastritis, stomach ulcers, irritable bowel syndrome or acid reflux, have a gut that is already sensitive or damaged. Adding a substance that irritates the stomach and disturbs its nerves can make their condition much worse, and can turn a manageable problem into a painful one that lasts for weeks. For these people, the risk is not theoretical. It is a direct threat to a part of the body that is already struggling.

People who take medicines that affect the stomach or the gut are also at greater risk. Some medicines increase stomach acid, some thin the stomach lining, and some slow down digestion. When these effects combine with psilocybin, the stomach can be harmed more than either factor would cause on its own. People who take medicines for mental health conditions are in a particularly difficult position, because psilocybin can interact with those medicines in ways that affect both the brain and the gut. Anyone who takes regular medicine should talk to a doctor before considering any substance that affects the brain or the stomach, and should never stop their prescribed medicine to take something else.

Young people and people with a small body weight may also react more strongly, because the same amount has a greater effect on a smaller body. People who are already unwell, tired, dehydrated or hungry are more likely to feel sick. And people who mix psilocybin mushrooms with alcohol or other substances put their stomach under even more strain, because alcohol itself irritates the stomach lining and increases acid. Mixing substances does not cancel out the risks. It adds them together, and the stomach is often the first place where that combined harm shows up.

What to Do If the Stomach Does Not Settle

If a person has taken psilocybin mushrooms and their stomach is upset, the first thing is to stay calm and to stay with someone they trust. Sitting up, rather than lying flat, can help with nausea. Sipping small amounts of plain water, once vomiting has eased, can help to replace lost fluid. It is better to take small sips often than to drink a large amount at once, which can bring the nausea back. Plain, light foods, such as toast or rice, can be tried later, when the stomach feels calmer, but only in small amounts, and only if the person feels able to eat.

It is important not to take other medicines to settle the stomach without advice, because some medicines can interact badly with psilocybin or can hide a warning sign that needs attention. It is also important not to drink alcohol to calm the stomach, because alcohol will irritate it further. If the person is confused, very frightened, or cannot stay awake, they need medical help, not home remedies. The same is true if vomiting does not stop, if there is blood, if the pain is severe, or if the person cannot pass urine. In these cases, calling emergency services or going to a hospital is the right thing to do, and it should not be delayed because of worry about the law or about embarrassment. Health professionals are there to help, and a stomach emergency is a medical matter first.

The longer view matters too. If a person has had a bad stomach reaction once, they are likely to have it again if they take psilocybin mushrooms again. The stomach does not become used to the irritation in a helpful way. It becomes more sensitive. The safest choice is not to repeat the experience, and to talk honestly with a health professional about what happened. That conversation can help the person understand their own risks, and can lead to support if they are finding it hard to stop using a substance that is harming them. There is no shame in asking for that help. The stomach has already spoken clearly. Listening to it is the sensible thing to do.

My Take:

I want to be honest about what I think when I read about psilocybin mushrooms and the stomach, because the stomach part of this story is usually treated as a footnote, and I think that is wrong. Most of the talk about these mushrooms is about the mind: the visions, the changed thoughts, the feeling of seeing the world differently. The stomach is mentioned as a small price to pay, a bit of nausea at the start, and then the conversation moves on. But for the person who is actually sitting there feeling sick, doubled over with cramps, unable to keep water down, the stomach is not a footnote. It is the whole experience. It is what they remember when the rest has faded. I think we should take that seriously, because pain is pain, whether it is in the mind or in the gut, and dismissing it does a disservice to the people who suffer it.

What bothers me most is the way nausea is talked about as if it were a test, or even a good sign. I have heard people say that feeling sick means the mushrooms are working, or that vomiting is a kind of cleansing. I do not accept that. Nausea is the body saying that something is wrong. Vomiting is the body trying to protect itself. Calling that a cleansing, or a sign that the experience is going well, is a way of making a harmful effect sound spiritual or meaningful when it is simply the gut reacting to a substance it cannot handle. I think that kind of talk is dangerous, because it encourages people to ignore a warning and to keep going when their body is telling them to stop. A warning is not a blessing. It is a warning, and it should be heard as one.

I also think about how lonely stomach pain can feel during an experience like this. When a person is feeling strange in their mind, and their stomach is hurting at the same time, they can feel very alone, even if other people are in the room. They may not be able to explain what is wrong, because their thoughts are confused, and the people around them may not understand how bad the pain is. They may be afraid to say they need help, because they do not want to spoil the experience for others, or because they are embarrassed about being sick. That silence can make a bad situation worse. I think it matters to say clearly that needing help is not a failure, and that asking for it is the right thing to do, whatever the situation.

The connection between the gut and the brain is something I keep coming back to, because it explains so much of what happens here. We are taught to think of the stomach and the mind as separate, as if one belongs to the body and the other belongs to somewhere else. But they are not separate. They share nerves, they share chemicals, and they affect each other constantly. When I read that most of the body’s serotonin is in the gut, it makes sense to me that a substance which changes serotonin would upset the stomach. It is not a mystery, and it is not a surprise. It is a direct consequence of how the body works. I wish more people understood that, because then they would not be surprised when their stomach reacts, and they would not be so quick to dismiss the reaction as unimportant.

I think about the people who already have stomach problems, and I feel a particular concern for them. A person with gastritis or ulcers or irritable bowel syndrome already lives with a gut that is sensitive and sometimes painful. They have learned what foods to avoid, what medicines help, and how to manage a bad day. Then someone tells them that psilocybin mushrooms are natural, and therefore safe, and they believe it, because natural sounds harmless. But natural does not mean safe. Many natural things are harmful, and a mushroom that disturbs the gut is a real risk for a person whose gut is already damaged. I think the word natural is used too easily, and it hides the truth. A substance can grow in the ground and still harm the stomach badly.

There is also a practical side to this that I think about a lot. A bad stomach reaction does not just last for a few hours. It can ruin the next day, and sometimes the next few days. A person may miss work, or miss a family meal, or be unable to eat properly, and those small losses add up. If the person uses the mushrooms regularly, the losses add up even more. They may lose weight, they may become run down, they may find that foods they used to enjoy now make them feel ill. These are not dramatic harms, and they do not make headlines, but they change a person’s daily life in a quiet, steady way. I think that quiet harm deserves more attention than it gets, because it is the harm that most people actually live with.

I am also struck by how unpredictable the stomach reaction is. One batch can be stronger than another. One person can feel fine while another feels terribly sick on the same amount. A person can feel fine the first time and very ill the second time. That unpredictability makes it impossible to plan for, and it makes it impossible to say that a particular amount is safe for a particular person. I think honesty about that unpredictability matters. If someone tells you that a certain amount will only cause mild nausea, they do not know that. They cannot know it, because the mushrooms vary and bodies vary. The only honest statement is that nausea and stomach pain are common, that they can be severe, and that no one can promise you will be spared.

When I think about what I would say to a person who is considering taking psilocybin mushrooms, the stomach is one of the first things I would mention, not the last. I would tell them that feeling sick is not a small thing, and that vomiting, cramps and bloating are not rare. I would tell them that if their stomach is already sensitive, the risk is higher. I would tell them that being sick does not make the experience end sooner, and that the stomach can take longer than the mind to recover. And I would tell them that if they do feel very ill, they should get help without delay, and without shame. These are simple points, but they are the points that matter when a person is actually feeling ill, and they are too often left out of the conversation.

I think about families too, because a person who is sick at home affects the people around them. A parent who cannot eat, a partner who is doubled over in pain, a young person who is vomiting and frightened: these things worry the people who love them, and they create a burden that is not always talked about. Families often do not know what has happened, or they are afraid to ask. I think it helps when information is clear and honest, so that families can understand what is going on and can help without judgement. A stomach problem caused by a substance is still a stomach problem, and it still deserves care, whoever caused it and however it happened.

Finally, I want to say something about listening to the body. The stomach is not a silent organ. It gives clear signals when it is unhappy: nausea, pain, bloating, a feeling of fullness that does not go away. Those signals are not random. They are the body’s way of saying that something is wrong, and that it needs time and care to recover. I think we are too quick to override those signals, to push through pain because we have been told it is part of an experience, or because we do not want to admit that we made a mistake. I would rather people listened. If the stomach says no, that is information, not weakness. The sensible response is to stop, to rest, to get help if needed, and to think carefully before doing the same thing again. The body is not the enemy. It is trying to look after us, and the least we can do is pay attention when it speaks.

I also want to talk about recovery, because it is rarely described honestly. After a bad stomach reaction, the body does not simply switch back to normal when the mind effects end. The first day after is often the hardest for the stomach. Food tastes strange, or the thought of food brings back the sick feeling. Water helps, but only in small sips, and a person may need to eat very lightly for a day before they feel ready for a normal meal. That is not a failure of willpower. It is the gut healing at its own pace, and it should be allowed to do so. Rushing back to heavy food, or to alcohol, or to another substance, only sets the recovery back. I think patience here is not a luxury. It is part of the treatment, and it costs nothing, which makes it easy to overlook and easy to ignore.

There is another point that worries me, and it is about young people trying these mushrooms at a party or with friends, without any real information. A young person may have heard that psilocybin mushrooms are natural, or that they open the mind, or that everyone does it once. They may not have heard anything about the stomach at all. Then they feel sick, and they do not know whether what is happening is normal or dangerous, and they are afraid to tell an adult because they think they will be in trouble. That fear can delay help, and delay can turn a manageable problem into a serious one. I think adults need to be honest with young people about the risks, including the stomach risks, and young people need to know that asking for help when they feel ill is always the right choice, no matter how they became ill. No one should have to suffer in silence because they are embarrassed.

The last thing I want to say is about how I judge harm. Some harms are dramatic and easy to see: an accident, a hospital visit, a broken bone. Stomach harm from psilocybin mushrooms is usually quieter than that, and because it is quieter, it is often treated as if it does not count. But a stomach that hurts for days, a person who cannot eat properly, a gut that becomes sensitive to normal food: these things change daily life, and they matter to the person living with them. I do not think we should only care about harm when it is dramatic. I think we should care about it when it is real, and stomach pain is real. If this article helps even one person understand that their pain is not imaginary, and not a small price to pay, and that they deserve care and honest information, then it has done its job.

One more thing I think about is how little people are told before they take these mushrooms. They may be told about the visions and the changed thinking, but no one tells them that they may spend hours feeling sick, or that they may vomit again and again, or that their stomach may hurt for days afterwards. That missing information is not a small detail. It is the difference between a person who knows what to expect and can decide whether the risk is worth it, and a person who is frightened and unprepared when the sickness starts. I think anyone who talks about psilocybin mushrooms has a responsibility to mention the stomach, clearly and honestly, before a person decides, not after they are already ill. Information given too late is not much use to the person who needed it.

Frequently Asked Questions

Does Psilocybin Mushrooms cause nausea and vomiting?

Yes, nausea and vomiting are among the most common stomach effects of psilocybin mushrooms. Nausea often starts within thirty to sixty minutes, while the mushrooms are still being digested, and it can last for several hours. Some people vomit once and then feel a little better, while others vomit several times and become dehydrated. Vomiting does not remove the chemical from the blood, so it does not end the other effects sooner. If vomiting continues for more than a day, or a person cannot keep water down, they should seek medical help.

How long do Psilocybin Mushrooms stomach problems last?

For most people, the worst nausea, cramps and bloating last for a few hours, while the mind effects are active. Digestion can feel unsettled for a day or two afterwards, with a heavy stomach, irregular bowels or a poor appetite. If the problems last longer than a few days, or if they get worse rather than better, that is a sign to talk to a health professional. Repeated use can make stomach problems last longer, because the gut lining becomes more sensitive over time.

Can Psilocybin Mushrooms upset your stomach?

Yes, they very often do. The mushrooms are hard to digest, and the chemical they contain disturbs the nerves in the gut that control the movement of food. This can cause nausea, cramps, bloating, heartburn and changes in bowel habits. The stomach is usually the first part of the body to react, and for many people it is the most uncomfortable part of the whole experience. People with a sensitive stomach, or with a stomach condition such as gastritis or irritable bowel syndrome, are more likely to be badly affected.

Why does Psilocybin Mushrooms cause stomach pain?

Stomach pain happens for several reasons at once. The raw mushroom material irritates the stomach lining, the chemical disturbs the nerves that control gut movements, and stomach acid can increase and burn the lining. When the gut muscles squeeze in an irregular way, cramps follow. Anxiety makes the pain worse, because stress tightens the gut and increases acid. The pain can be in the upper stomach or lower down in the intestines, and it can come in waves or sit as a dull ache for hours.

Does Psilocybin Mushrooms affect digestion?

Yes, digestion is often disturbed. Food can sit in the stomach for longer than usual, causing a heavy, full feeling, or it can move too quickly through the intestines, causing loose stools. Stomach acid can rise or fall, which can cause heartburn or a sluggish feeling after eating. Bowel habits may be irregular for a day or two after use. With repeated use, digestion can become a longer-term problem, because the gut nerves and lining need time to recover and may become more sensitive.

Can Psilocybin Mushrooms damage the gut?

In the short term, they irritate the gut lining and disturb its normal movements, which usually settles within a few days. With repeated use, the damage can become more lasting. The gut lining can become inflamed, which makes it less able to protect itself and to absorb nutrients properly. Ongoing indigestion, regular cramps and a stomach that reacts badly to normal foods can follow. Blood in vomit or stools, severe pain that does not ease, or vomiting that continues for more than a day are warning signs that need urgent medical attention.