How to Calm an IBS Flare-Up Fast, and What to Eat Next

At my worst, two spoons of food meant two trips to the toilet. I lived with diarrhoea-type IBS for years. I know the cramps that fold you in half. I know the panic of searching for the nearest bathroom, and the fear of eating anything at all.

So this is not a list copied from a textbook. It is what I wish someone had told me during my own flares, checked against the newest research. Today I eat bread, dairy and meals out without fear. I also help clients in more than 15 countries calm their IBS.

Here is how to calm an IBS flare-up fast and what to eat for the next few days. You will also learn how to stop the next one.

First, make sure it really is a flare

IBS is common. A global survey of more than 73,000 adults found that about 1 in 25 online respondents met the strict medical criteria for IBS. But some symptoms are not IBS and need a doctor quickly.

Please see a doctor soon if you notice any of these.

• Blood in your stool, or black, tarry stools
• Weight loss you cannot explain
• Diarrhoea that wakes you up at night
• A fever, or vomiting that will not stop
• Symptoms that started after age 50
• A family history of bowel cancer, coeliac disease or inflammatory bowel disease

If none of these apply and your doctor has already diagnosed IBS, read on.

The first 60 minutes of a flare

When a flare hits, your gut and your nervous system are both on high alert. Your first job is to calm both.

1. Pause food for a little while. Give your gut a short rest. Sip warm water or a cup of peppermint tea instead.
2. Add warmth. Rest a warm water bottle on your belly. It has not been studied well, but it is safe, cheap and soothing.
3. Breathe slowly. Breathe in for 4 seconds and out for 6 to 8 seconds. Repeat for five minutes.
4. Loosen your clothes and lie down if you can. Pressure on your belly can make cramps feel worse.
5. Use what your doctor has advised. If you have medicine for IBS cramps or diarrhoea, take it as prescribed. A pharmacist can also tell you what is safe for you.

An honest note on breathing. In a small 2022 trial, four weeks of slow breathing did not change symptom scores on its own. I still teach it, because it helps many people feel calmer in the moment. Just do not expect it to fix everything by itself.

Peppermint oil, the debate

Peppermint relaxes the muscles of the gut. A review of 12 trials with 835 people found that peppermint oil capsules improved overall symptoms and belly pain compared with a dummy pill.

Now the twist. In a careful 2020 trial in the Netherlands, 189 people took two types of peppermint oil or a dummy pill for eight weeks. Neither type beat the dummy pill on the main pain measure. One type did help with pain, discomfort and overall severity on other measures.

So peppermint oil may help some people, but it is not magic. It can also cause heartburn. If you want to try capsules, ask your doctor or pharmacist first, especially if you have reflux.

What to eat during an IBS flare-up

For the next two or three days, think small, warm, simple and soothing. Eat little and often instead of three big meals.

Gentle foods to start with

• Plain white rice, rice porridge or congee
• Rice and split yellow lentil porridge, a traditional comfort food called khichdi, cooked soft with a pinch of cumin
• Boiled or steamed potatoes without the skin
• Oats cooked with water or lactose-free milk
• Eggs, boiled, poached or scrambled with little fat
• Plain chicken, fish or firm tofu, steamed or grilled
• Well-cooked carrots, zucchini, pumpkin and spinach
• Lactose-free yogurt, if dairy usually suits you
• A firm, just-ripe banana, or a few orange segments

If your flare is constipation

Add two green kiwifruits a day. In an international trial, people with IBS constipation who ate two green kiwis daily had more complete bowel movements each week and less discomfort. Drink plenty of water and take a gentle walk.

Foods to pause until you feel better

• Onion and garlic, including garlic powder and onion powder in sauces
• Large portions of beans and chickpeas
• Apples, pears, mango and watermelon
• Regular milk and soft cheeses, if lactose bothers you
• Wheat-heavy meals, like big plates of pasta or several slices of bread
• Sugar-free gum and mints made with sorbitol or other sugar alcohols
• Fried, greasy and very spicy food
• Coffee, alcohol and fizzy drinks

The UK’s National Institute for Health and Care Excellence gives similar advice. It suggests cutting back on caffeine, alcohol and fizzy drinks, and avoiding sorbitol if you have diarrhoea.

The sattvic secret your grandmother may have known

I strongly believe gut health plays a major role in nearly every health condition. And some of the best gut wisdom is very old.

Global traditional Ayurveda describes a sattvic way of eating. It is fresh, simple, home-cooked food that is easy to digest. A classic sattvic kitchen avoids onion and garlic.

Modern science now gives part of this a clear reason. Researchers at Monash University, who created the low FODMAP diet, list onion and garlic among the richest sources of fructans. Fructans are one of the fermentable carbohydrates that most often trigger symptoms.

So when I build a calming plan, I often start with sattvic-style meals. Soft rice and lentils, cooked vegetables, gentle spices like cumin and fennel, and no onion or garlic.

Herbs such as Kutaj and Bael have long been used in Ayurveda for loose stools, and Kutaj was part of my own recovery. Research on them is still early, and herbs can interact with medicines. Please use them only with expert guidance.

The fibre trap

Many people with a sensitive gut are told to eat more fibre. But the type matters a lot.

In a 2009 trial in the BMJ, 275 people with IBS took psyllium, wheat bran or a dummy powder for three months. Psyllium, a soluble fibre, helped more than half of them in the first month. Bran did not help much, and many people quit the bran because their symptoms got worse.

Try this. During a flare, go easy on bran, raw salads and whole grains. Once you feel steadier, a small daily dose of psyllium husk is often gentler. Start low, with half a teaspoon, and drink plenty of water.

Calm the gut-brain loop

Your gut and brain talk all day. Worry about a flare can tighten your gut, and a tight gut feeds more worry. Many people with IBS know this loop well.

A 2024 review of 42 trials with 5,220 people found that brain-gut therapies reduced IBS belly pain. The best studied were cognitive behavioural therapy and gut-directed hypnotherapy.

Sleep matters too. In a study of women with IBS, a poor night’s sleep predicted more belly pain, anxiety and tiredness the next day. My guides to better sleep and calming stress can help here.

Move gently once the worst has passed

In a Swedish trial, 102 people with IBS were asked to exercise moderately for 20 to 60 minutes, three to five days a week. After 12 weeks, the exercise group’s symptoms improved clearly. The other group’s did not.

Try this. Start with a 10-minute walk after meals once the cramps settle. Gentle yoga or stretching also works.

After the flare, find your triggers

A flare is a message. Once it settles, it is time to find out what set it off.

The low FODMAP diet has the strongest research of any IBS diet. A 2022 review of 13 trials ranked it first for overall symptoms, pain and bloating. In an earlier trial, people with IBS had about half the symptoms on a low FODMAP diet compared with a typical diet.

But it is not meant to be forever. It works in three stages. You cut back on high FODMAP foods for two to six weeks. Then you bring them back one by one and keep only the limits you truly need. Staying strict for too long can cut out foods your gut bacteria need.

This is close to how I work with clients. First we identify the root cause, starting with your poop, your history, your stress and your sleep. Then we stabilise your gut with weekly plans built around your triggers. Finally, we sustain your health so you can eat freely again.

Try this. Keep a simple diary for two weeks. Write down what you ate, how you slept, your stress level, your cycle if you have periods, and your symptoms. Patterns appear faster than you think.

Your IBS flare-up kit

• A warm water bottle or heat pad
• Peppermint tea bags
• Plain rice or instant oats
• Any medicine your doctor has advised, plus a spare pack in your bag
• A water bottle
• A note on your phone with your trigger foods
• A breathing timer app or a calming playlist

Frequently asked questions

How long does an IBS flare-up last?

It varies from person to person. Many flares settle within a few hours to a few days. If symptoms last longer than usual, keep getting worse, or come with any warning signs above, see your doctor.

What should I eat during an IBS flare-up?

Stick to small, warm, simple meals like rice, rice and lentil porridge, oats, eggs, potatoes, well-cooked vegetables and plain fish or chicken. Avoid onion, garlic, greasy food, alcohol and coffee until you feel better.

What triggers an IBS flare-up?

Common triggers include certain foods, large meals, stress, poor sleep, periods, alcohol and caffeine. Triggers are personal, which is why a diary helps so much.

Can stress alone cause an IBS flare-up?

Stress can set off or worsen symptoms because the gut and brain are closely linked. Brain-gut therapies like cognitive behavioural therapy and gut-directed hypnotherapy reduced IBS pain in many trials.

Is peppermint tea good for IBS?

Many people find it soothing. Most research has tested peppermint oil capsules, not tea, and the results are mixed. Skip it if peppermint gives you heartburn.

What I want you to remember

A flare feels endless, but it passes. Calm your body first, eat small and simple for a few days, and skip the usual triggers. Then use the flare as a clue to what your gut needs.

IBS changed my life once. Learning to work with my gut changed it again. Yours can change too.

Keep reading my IBS guides for what to eat every day, how to find your triggers and how to get lasting relief.