What Does Ayahuasca Do to Your Stomach

Ayahuasca is a bitter plant brew from the Amazon region of South America. It has been used for a long time in traditional ceremonies there, and in recent years it has become known in other parts of the world too, often through retreats and travel stories. People who talk about it usually focus on the visions and the intense mental experience it can cause. What they talk about far less is the stomach. Yet for most people who drink it, the stomach is where the experience begins, and where the worst of it is felt. Nausea, vomiting, cramps and diarrhoea are not rare side effects. They are among the most common reactions of all, and they can be severe enough to leave a person weak, dehydrated and frightened.

This matters because the stomach is not a side issue. When your stomach is in pain, everything else stops. You cannot eat properly, you cannot sleep properly, and you cannot think clearly. A person who has spent a night vomiting and shaking does not wake up the next morning ready for normal life. They wake up sore, empty and exhausted. This article explains, in plain words, what ayahuasca does to the stomach and to digestion: why nausea is so common, what cramps and diarrhoea mean, how eating and appetite are affected, how the gut and the brain affect each other, and when stomach pain should be taken as a warning to get help quickly. It is general information only, not individual medical advice. If you are worried about your health, or you have stomach problems after using any substance, a qualified health professional is the right person to talk to.

What Ayahuasca Is and Why the Stomach Reacts So Strongly

Ayahuasca is made by boiling together plants, traditionally a vine and leaves from plants that grow in the Amazon rainforest. The brew contains a powerful substance that changes how the brain works, and it also contains other plant chemicals that slow down the body’s normal way of breaking substances down. That combination is what makes the mental effects so strong and so long-lasting. It is also what makes the brew so hard on the body. The stomach is the first organ to meet it, and it meets it in a concentrated, bitter, acidic form.

Think of it this way. Your stomach is designed to handle food and drink, but it is also designed to protect you. When it senses something harsh, bitter or unfamiliar, its first response is often to reject it. That is why nausea comes on so fast after drinking ayahuasca. The lining of the stomach becomes irritated, the muscles of the stomach wall start to contract in the wrong direction, and the body tries to push the brew back out. This is not a sign that something is working properly. It is the body’s defence system doing what it was built to do when it meets something it cannot handle.

The brew is also taken on an empty stomach in many traditional settings, which makes the irritation worse. There is no food to dilute it, nothing to slow it down, and nothing to cushion the stomach lining. The bitter liquid sits directly against the stomach wall, and the strong chemicals in it act on the gut as well as on the brain. The gut has its own large network of nerves, and those nerves respond to the brew with cramping, churning and a strong urge to empty the stomach and the bowels. That is why so many people experience both vomiting and diarrhoea in the same night.

There is another factor that is often missed. Ayahuasca affects blood pressure and heart rate, and it can cause sweating, shaking and a feeling of intense anxiety. All of those things make the stomach worse. When the body is under stress, digestion slows down in some ways and speeds up in others, and the stomach becomes more sensitive to pain. A person who is already frightened by the mental effects of the brew is more likely to feel every cramp more sharply, and more likely to vomit again. The stomach and the mind are not separate here. They feed into each other, and a bad night can turn into a worse one because of it.

Nausea and Vomiting: The Most Common Stomach Reaction

Nausea is the reaction almost everyone talks about after drinking ayahuasca. It usually starts within the first hour, sometimes within minutes. It begins as a heavy, sick feeling low in the stomach, then it spreads. The mouth waters, the skin goes cold and clammy, and the person feels that they are about to be sick. For many people, that feeling does not pass quickly. It comes in waves, easing for a few minutes and then returning stronger, and it can last for hours.

Vomiting often follows, and it can be repeated. Some people vomit once and feel a little better afterwards. Others vomit many times through the night, until there is nothing left in the stomach and they are bringing up only bitter fluid. Each time the stomach contracts, the muscles of the abdomen tighten, the throat burns, and the person is left shaking and exhausted. After several rounds, the stomach feels raw and sore, as if it has been scrubbed from the inside. Even swallowing water can set off another wave of nausea.

In traditional settings, vomiting is sometimes described as a cleansing or a healing part of the ceremony. That language can be misleading, and it can stop people from seeing the vomiting for what it is. Vomiting is the body trying to get rid of something harmful. It is not a sign that the body is being healed. It is a sign that the stomach has been irritated past the point where it can cope, and that the body is losing fluid, salts and energy with every episode. A person who vomits repeatedly is not being cleansed. They are becoming dehydrated, and dehydration itself makes nausea worse, which creates a cycle that is hard to break.

The danger grows when vomiting continues for a long time. The body loses water and the salts it needs to keep the heart and muscles working properly. The mouth becomes dry, the lips crack, the head aches, and the person feels dizzy when they stand up. The stomach, now empty, continues to cramp. Some people cannot keep even small sips of water down, and that is the point at which the situation becomes serious. A person in that state needs care, fluids and rest, and they should not be left alone to ride it out. The idea that vomiting is simply part of the experience can keep people from getting help when they need it most.

It is also worth saying plainly that not everyone vomits the same amount, and that does not mean the brew was safer for the people who vomited less. Some people have a stronger gag reflex, some have a more sensitive stomach lining, and some have eaten differently before drinking. The amount of vomiting is not a measure of how strong the experience was, or of how much a person needed it. It is a measure of how hard the body fought to protect itself, and that fight leaves its mark either way.

Cramps, Diarrhoea and the Days After

Vomiting is only half of the stomach story. Many people also develop diarrhoea, sometimes at the same time as vomiting, sometimes in the hours after. The cramps that come with it are not mild. They arrive as sharp, gripping pains low in the belly, often in waves, and they can be strong enough to make a person double over. Between cramps there may be a short rest, and then the next wave starts, and the person has to move quickly. In a ceremony setting, far from a proper toilet, that alone can be frightening and humiliating.

Diarrhoea after ayahuasca happens for a few reasons that work together. The brew irritates the lining of the gut, which makes the gut move food and fluid through much faster than normal. The gut also releases extra fluid into the bowel, which is why the stools become loose and watery. At the same time, the stress of the experience, the fear and the racing heart, push the gut to empty itself. The result is that the body loses water from both ends at once, and that is why people can become dehydrated so quickly.

The days after can be just as uncomfortable as the night itself. The stomach often stays tender for a day or two, and the bowels may stay unsettled for longer. Some people find that they have loose stools for several days. Others swing the other way, with constipation after the diarrhoea, because the gut has been emptied and the normal rhythm has been disrupted. Eating becomes difficult either way. A normal meal can bring back cramps, and a heavy meal can feel impossible. Many people live on plain, light food for days, not because they are being careful, but because their stomach will not accept anything else.

This is also where the damage can quietly add up. A stomach that has been through a night of vomiting and diarrhoea is a stomach that is sore, inflamed and tired. Its lining needs time to recover, and during that time it is more sensitive to anything harsh: spicy food, alcohol, coffee, and even large meals. People who use ayahuasca again before the gut has recovered are asking a sore stomach to go through the same punishment twice, and the second time is often worse. The cramps come back faster, the vomiting starts sooner, and the recovery takes longer. The gut does not forget a bad night quickly.

Appetite, Eating and Losing Weight

One of the most underreported effects of ayahuasca is what it does to appetite. In the days after a bad experience, many people simply do not want to eat. Food looks unappealing, the smell of cooking makes them feel sick, and the thought of a full plate is enough to bring back nausea. This is partly because the stomach is still sore, and partly because the brain has linked food with the sickness of that night. That link can last longer than people expect.

When a person eats very little for several days, they lose energy. They feel weak, shaky and cold. Their concentration falls, their mood drops, and simple tasks feel harder. This is not a small thing. Food is fuel, and a body that has lost fluid through vomiting and diarrhoea and then takes in very little food is running on empty. Some people lose a noticeable amount of weight after repeated use, not because they were trying to, but because their stomach could not face food and their appetite had gone.

There is also a quieter problem. When eating becomes linked with pain or sickness, some people start to avoid meals even after the stomach has healed. They eat less than they need, they skip meals, and they become nervous about eating in front of others. That pattern, if it continues, can turn into a lasting problem with food. The stomach may have recovered, but the fear of feeling sick again has not, and that fear shapes every meal. This is one of the ways a single bad night can change everyday life long after the physical symptoms have gone.

For people who already struggle with eating, or who are underweight, or who have a sensitive stomach, this loss of appetite is a serious risk. The body needs regular food to keep the gut lining healthy, to keep the immune system working, and to keep energy steady. A few days of eating very little is hard on a healthy person. It is much harder on someone whose body was already struggling. Anyone who finds that they cannot eat properly for more than a few days after using ayahuasca should talk to a health professional rather than waiting for the appetite to return on its own.

The Gut and the Brain: Why Stress and Fear Make It Worse

The gut and the brain talk to each other constantly. The gut has millions of nerve cells, and it sends signals to the brain all day long. That is why you feel butterflies in your stomach when you are nervous, and why fear can make you need the toilet urgently. Ayahuasca makes this connection much stronger and much harder to control, because it changes how the brain processes fear, memory and sensation, and it irritates the gut at the same time.

During the experience, many people feel intense fear, confusion or sadness. The mind can race, thoughts can loop, and ordinary things can feel threatening. That fear does not stay in the head. It travels down to the gut, and the gut responds by cramping harder, churning faster and emptying itself. The pain in the gut then sends a signal back to the brain, which makes the fear worse, and the fear makes the gut worse again. It is a loop, and once it starts, it can be very hard to break from the inside.

This is also why the setting matters so much, even though it cannot make the brew safe. A person who is alone, far from home, in a strange place, with no one they trust nearby, will feel more fear than a person who is safe and supported, and their stomach will suffer more for it. But even in the best setting, with kind people nearby and a calm room, the brew itself still irritates the gut and still changes the brain. A calm setting can soften the fear. It cannot stop the stomach from reacting to a harsh, bitter liquid that the body is trying to reject.

Afterwards, the link between the gut and the brain can stay sensitive. Some people find that for days or weeks after, stress makes their stomach hurt more easily, or that they feel nauseous when they are anxious. This is not imagined. The gut has been through a severe shock, and the nerves that connect it to the brain have been on high alert. It takes time for that system to settle down, and during that time, ordinary stress can bring back stomach symptoms that had seemed to pass.

Dehydration, Weakness and Feeling Empty

Vomiting and diarrhoea both take water out of the body, and when they happen together, the loss is fast. The body also loses salts that it needs to keep the heart beating steadily, the muscles working, and the brain thinking clearly. Sweating, which is common during the experience, adds to the loss. A person can become dehydrated in a single night, and the signs are easy to miss when the person is also confused, frightened and exhausted.

The first signs are often simple: a dry mouth, a headache, feeling dizzy when standing, and urine that is dark and passed less often than usual. As dehydration gets worse, the heart beats faster, the person feels weak in the legs, and thinking becomes foggy. They may feel cold and shaky even in a warm room. They may struggle to keep water down, which makes the problem worse, because the body needs fluid and the stomach will not accept it.

This is the part of the story that is most often played down. People talk about the visions and the ceremony, and they mention vomiting as if it were a small price. They do not talk about the person who spent the next day unable to stand up without feeling faint, or the person who needed days to feel strong enough to eat a normal meal. That weakness is real, and it comes from the stomach and the bowels losing more than the body could afford to lose. A healthy adult can usually recover from one bad night with rest, fluids and time, but the recovery is not instant, and it is not guaranteed to be smooth. For older people, for people who are already unwell, and for people who have heart or kidney problems, dehydration is a serious risk, not a minor inconvenience.

There is also the risk of breathing in vomit, which is a real and dangerous possibility when a person is confused, lying down, or unable to move properly. If a person vomits while lying flat on their back and cannot turn over or sit up, the vomit can enter the airways and block breathing. That is why no one who has taken ayahuasca should ever be left alone, and why someone who is vomiting and drowsy needs to be watched closely and kept on their side if possible. This is not a rare worry. It is one of the most basic safety concerns with any substance that causes heavy vomiting and confusion.

When Stomach Pain Is a Warning Sign

Most stomach pain after ayahuasca fades within a day or two, as the gut settles and the person starts to eat and drink again. But some pain does not fade, and some pain is a sign that something more serious is happening. It is important to know the difference, because waiting too long can turn a bad night into a medical emergency.

Pain that is severe and does not ease, pain that keeps getting worse, or pain that is joined by a fever, should not be ignored. Vomiting blood, or bringing up material that looks like coffee grounds, is a sign that the stomach lining may be damaged and bleeding, and it needs urgent care. The same is true of stools that are black, or that contain blood. A belly that becomes hard, swollen and very tender to touch is also a warning sign. So is being unable to keep any fluid down for many hours, or passing almost no urine. These are not things to wait out. They are reasons to seek medical help straight away, and to tell the health professional honestly what was taken, so they can give the right care.

Chest pain, trouble breathing, a very fast heartbeat that does not slow down, or feeling faint and confused for a long time after the experience are also reasons to get help urgently. Ayahuasca can raise heart rate and blood pressure, and it can interact dangerously with other substances and with some prescription medicines. The combination can put real strain on the heart, and stomach pain can be part of a wider problem, not just a sore gut. A person who is in pain and also feels that their heart is racing, or that they cannot breathe properly, should not try to sleep it off.

It is also worth remembering that ayahuasca can be dangerous for people with certain health conditions, and that the risk is not always obvious beforehand. People with stomach ulcers, long-term gut problems, liver problems, heart problems or high blood pressure face a higher risk, and so do people who are pregnant. The brew can also interact badly with some medicines, and those interactions can be life-threatening. That is why honest, general information matters more than the stories told by people selling retreats. A retreat organiser has a reason to play the risks down. A health professional does not.

Who Faces Higher Stomach Risks

Not everyone who drinks ayahuasca has the same experience, and not everyone faces the same risk. The stomach is more vulnerable in some people than in others, and knowing that can help a person understand why their experience was worse than someone else’s, or why they should be especially careful.

People who already have stomach problems, such as ulcers, acid reflux, or a long-term gut condition, are more likely to have severe pain, vomiting and bleeding. Their stomach lining is already irritated, and the brew adds a strong new irritation on top of it. People who have had stomach surgery, or who have a narrowed gut, also face a higher risk, because the gut is less able to cope with sudden cramping and swelling.

Age matters too. Older people are more likely to become dehydrated quickly, and their bodies recover more slowly. Younger people are not safe either, especially if they are small, underweight, or have not eaten properly. A smaller body loses fluid faster, and a body that is already low on energy has less to spare.

People who take other substances at the same time, including alcohol, face a much higher risk. Alcohol irritates the stomach lining on its own, and when it is combined with ayahuasca, the vomiting, dehydration and confusion can become far worse. The same is true of some prescription medicines, which can interact with the brew in dangerous ways. Anyone who takes regular prescription medicine should know that combining it with ayahuasca can be risky, and that the risk is not always written on the label. A health professional can explain the interaction in general terms, and that conversation is worth having before any decision is made.

Finally, the strength of the brew itself varies a great deal. There is no standard recipe, no standard dose, and no quality control. One batch can be far stronger than another, and a person has no way of knowing how strong it is until they have already drunk it. That uncertainty is part of the risk. A person who had a mild reaction once may have a severe reaction the next time, simply because the brew was stronger, or because their stomach was already tired. There is no safe way to predict it, and that is one of the most honest things that can be said about ayahuasca and the stomach.

My Take:

I will be honest with you. When I think about ayahuasca, the first thing that comes to my mind is not the visions or the ceremonies or the stories people tell when they come home. It is the stomach. It is the person doubled over in pain, vomiting again and again, with no strength left and no idea when it will stop. That image stays with me because it is so ordinary and so human. We all know what it feels like to have a bad stomach, to be sick in the night and to feel too weak to get up. Now imagine that feeling made ten times stronger, mixed with fear and confusion, in a strange place, far from home. That is what many people go through, and I do not think it is talked about honestly enough.

What bothers me most is the language used around the vomiting. I have heard it called cleansing, healing, and purging, as if the body were throwing out something bad and becoming cleaner. I do not buy that. Vomiting is the body trying to protect itself from something it cannot handle. It is not a healing process. It is a distress signal. When a person vomits repeatedly, they are losing water, salts and energy, and their stomach lining is being hurt. Calling that cleansing does not make it safer. It just makes it easier for people to ignore the harm, and it makes it harder for the person who is suffering to ask for help, because they have been told that suffering is part of the point.

I also think about the people who go to these retreats because they are looking for help. Many of them are not thrill-seekers. They are people who are struggling with sadness, with grief, with anxiety, or with a sense that their life has lost direction. They are vulnerable, and they are looking for something that will make them feel better. To offer them a brew that makes them violently sick, frightens them, and leaves them weak for days, and to call that healing, feels wrong to me. A person who is already struggling does not need to be made physically ill on top of everything else. They need care, time, and honest support, not a night of vomiting dressed up as a cure.

The part I keep returning to is dehydration, because it is so easily dismissed and so quietly dangerous. People talk about vomiting as if it were a small thing, a brief unpleasantness before the real experience begins. But a night of vomiting and diarrhoea can leave a person so dehydrated that they cannot stand up without feeling faint, and so weak that they cannot eat for days. That is not a small thing. That is a body that has lost more than it could afford to lose. And the worst part is that the person often does not realise how dehydrated they are, because they are confused, exhausted, and far from anyone who can tell them plainly that they need fluids and rest.

I think about the setting too, because it shapes everything. A person who is sick in their own home, with someone they trust nearby, with clean water, a toilet and a phone, is in a very different position from a person who is sick in a remote retreat, far from a hospital, with no one they know. The second person is at the mercy of the people running the retreat, and those people may not have medical training, may not have proper facilities, and may have a reason to play down what is happening. That gap in safety is something I cannot ignore. If a substance can make you vomit for hours, leave you dehydrated and confused, and possibly put you in danger, then where you take it and who is watching you matters enormously.

Another thing that stays with me is the way the stomach remembers. I have read about people who felt sick at the smell of certain foods for weeks after a bad experience, and people who could not eat a normal meal without feeling anxious. That is not a small side effect. Food is one of the basic pleasures of life, and eating is one of the basic ways we take care of ourselves. When a single night makes eating frightening, that changes daily life in a real way. It changes what you can eat, when you can eat, and how you feel about sitting down with your family for a meal. That loss is quiet, and it does not show up in the stories people tell about visions, but it matters.

I am also troubled by the way the risks are hidden behind beautiful language. Retreat websites talk about transformation, about ancient wisdom, about opening the heart. They rarely talk about the person who vomited blood, or the person who was taken to hospital with severe dehydration, or the person who had a panic attack that lasted for hours. Those stories exist, but they are not on the websites. They are told quietly, afterwards, by people who feel embarrassed or frightened, and who wonder whether they did something wrong. They did not do something wrong. They took a substance that is harsh on the stomach and on the brain, and their body reacted the way bodies react. The shame should not be theirs. It should belong to the people who sold them a story without telling them the whole truth.

If someone I cared about asked me about ayahuasca and the stomach, I would tell them this plainly. Your stomach will almost certainly suffer. You will probably feel sick, you will probably vomit, and you may have diarrhoea and cramps that last for hours. You will lose fluid and strength, and you will need days to recover. If you already have stomach problems, if you take regular medicine, if you have heart or liver problems, or if you are pregnant, the risk is higher, and you should not take that risk lightly. And if you do go ahead despite that, you should never be alone, you should never be far from medical help, and you should tell someone you trust exactly what you have taken, so they can help you if things go wrong.

I know that some people will say I am being too cautious, or that I do not understand the spiritual side of ayahuasca. I understand that it matters to some people, and that it has a long history in the Amazon. But history does not make a substance safe for the stomach, and spiritual language does not stop vomiting, dehydration or bleeding. A tradition can be respected and still be risky. Both things can be true at the same time. Respecting a tradition means telling the truth about it, including the parts that are painful and dangerous, not just the parts that sound beautiful.

I also think about the people who come home and say nothing. They had a terrible night, they felt sick for days, and they do not tell anyone, because they are embarrassed, or because they do not want to admit that the experience they paid for and hoped would help them actually hurt them. That silence worries me, because it means the next person hears only the good stories, and they go in unprepared. If you have had a bad experience, telling someone honestly about it is not a failure. It is a kindness to the next person, and it is a way of taking care of yourself too. You do not have to carry a bad night alone.

Finally, I want to say something simple about the body. The body is not an enemy to be conquered, and the stomach is not something to be punished in the hope of a better mind. The body is the thing that carries you through every day, that lets you eat, sleep, walk and think. When it is in pain, it is telling you something, and the right response is to listen, not to push through. A substance that makes the stomach suffer for hours is not a small thing, even if the mind sees interesting things in the meantime. The stomach matters, and its pain matters, and anyone thinking about ayahuasca deserves to know that before they decide, not after.

There is one more thing I think about, and it is the person who has already been through it and is still feeling the effects. I imagine someone sitting at home a week later, still afraid to eat a normal meal, still waking up with a sore stomach, still wondering whether they have damaged themselves for good. That person needs a plain answer, not a mystical one. The honest answer is that most stomachs do recover, slowly, with rest, plain food, water and time, but recovery is not a promise, and it is not a reason to go through it again. If the pain is still there, if eating is still frightening, if vomiting has not stopped, that person should talk to a health professional and tell them exactly what happened. Hiding the details out of embarrassment only makes it harder for the professional to help.

I also think about the difference between a single bad night and a pattern. One bad night is hard enough. But some people go back, again and again, because they believe the next time will be different, or because they feel they have not yet received what they went looking for. Each return is another night of vomiting, another loss of fluid, another sore stomach that has to heal again. The gut does not become stronger by being hurt repeatedly. It becomes more sensitive, more easily irritated, and slower to recover. A person who keeps returning is not building resilience. They are wearing down the very organ they need to eat, to stay strong, and to live a normal life. That is a trade I cannot see the sense in, however powerful the visions might be.

And I think about what I would want if I were the person deciding. I would want someone to sit with me, without judgement, and tell me the whole story in plain words: you will probably be sick, you will probably vomit many times, your stomach will hurt, you will lose water and strength, you will need days to feel normal again, and there is a real chance it will be worse than you expect. I would want to know about the risks to my heart, to my stomach lining, and to the medicines I take. I would want to know that the place I was going to was far from a hospital, and that the people running it might not be able to help me if something went wrong. I would want that honesty before I decided, because after I had drunk the brew, honesty would be too late. That is the standard I think everyone deserves, and it is the standard I have tried to meet here.

One more thought stays with me, and it is about trust. When a person is in pain, vomiting, frightened and far from home, they have to trust the people around them completely. They have to trust that those people will watch them, will give them water, will keep them safe, and will call for medical help if things go wrong. That is an enormous amount of trust to place in strangers, especially strangers who have a financial interest in the ceremony going ahead. I would not place that trust lightly, and I would want to know, before I went, exactly who would be watching me, what training they had, and how far away the nearest hospital was. If those answers were vague, or if I was told not to worry, that would tell me everything I needed to know. A place that is honest about danger is a place that takes safety seriously. A place that hides danger is not.

I also keep thinking about the quiet weeks that follow a bad night, when the story is over for everyone else but not for the person who lived it. Friends stop asking, the photographs stop being shared, and life is supposed to go back to normal. But the person still feels nervous before meals, still wakes up tired, and still wonders whether their stomach will ever feel fully right again. That loneliness is real, and it is made worse by the feeling that they should be grateful for an experience that was supposed to heal them. I want that person to know that they are allowed to say it was awful, allowed to say it hurt them, and allowed to ask for help without being told they missed the point. The point of any healing should be that the person feels better, not that they learn to call their pain by a prettier name.

Frequently Asked Questions

Can Ayahuasca damage the gut?

Yes, it can. The brew irritates the lining of the stomach and the gut, and that irritation can cause inflammation, pain, vomiting and diarrhoea. For most people the irritation settles within a few days, but repeated use can keep the gut sore for longer, and people who already have stomach problems face a higher risk of more serious damage. Vomiting blood or passing black or bloody stools are signs that the gut may be damaged, and they need urgent medical care.

Does Ayahuasca cause nausea and vomiting?

Yes, nausea and vomiting are among the most common effects of ayahuasca. Most people feel sick within the first hour, and many vomit repeatedly through the night. The brew is bitter and harsh, it irritates the stomach lining, and it acts on the gut’s nerves, which makes the stomach contract and try to empty itself. Vomiting is the body’s defence against something it cannot handle, not a sign of healing.

Does Ayahuasca affect digestion?

Yes. Ayahuasca can disturb digestion in several ways. It can speed up the gut and cause diarrhoea, it can make the stomach cramp, and it can leave the gut unsettled for days afterwards. Many people find that they cannot eat normally for a while, that their appetite is low, and that ordinary meals bring back cramps or nausea. The normal rhythm of digestion takes time to return after a severe night of vomiting and diarrhoea.

Can Ayahuasca upset your stomach?

Yes, it almost always does to some degree. Even people who do not vomit heavily usually feel nauseous, bloated or crampy. The stomach is the first organ to meet the brew, and it reacts to the bitter liquid, the strong chemicals and the stress of the experience. Some people have a mild reaction, but a severe reaction, with repeated vomiting and diarrhoea, is common and should not be treated as unusual.

Why does Ayahuasca cause stomach pain?

Ayahuasca causes stomach pain because it irritates the stomach lining, makes the stomach and gut muscles contract strongly, and acts on the nerves that connect the gut and the brain. Fear and stress during the experience make the pain worse, because a stressed gut cramps harder. The pain can also come from the stomach being empty after vomiting, from acid irritating the raw lining, and from the bowel cramping as it empties itself.

How long do Ayahuasca stomach problems last?

For most people, the worst symptoms last for the night of use and the day after. Nausea and cramps usually ease within one to two days, and appetite usually returns gradually over a few days. But some people have loose stools, a tender stomach or a low appetite for a week or longer, especially after repeated use or after a very severe night. If vomiting continues, if you cannot keep fluids down, or if pain does not ease after a few days, you should seek medical advice.