An IBS flare-up can often be managed at home with a combination of dietary changes, over-the-counter remedies, and stress-reduction techniques. Flare-ups last anywhere from a few days to several weeks, and the strategies that work best depend on whether your primary symptoms are diarrhea, constipation, or pain. Here’s what to do when one hits.
Calm the Pain First
Abdominal cramping is usually the most disruptive part of a flare, and the fastest relief comes from heat. Placing a heating pad or hot water bottle on your abdomen relaxes the smooth muscle in your colon by increasing blood flow to the area. Keep the heat at a comfortable level and use it for 15 to 20 minutes at a time, as often as you need.
Enteric-coated peppermint oil capsules are one of the better-studied natural options for IBS pain. In clinical trials, about 79% of adults taking peppermint oil reported a reduction in pain severity, compared to 43% on placebo. The typical dose studied is 0.2 to 0.4 mL taken three times daily. The enteric coating matters: it prevents the capsule from dissolving in your stomach (which can cause heartburn) and lets it reach your intestines where it relaxes the gut muscle.
If cramping is severe, prescription antispasmodic medications work by blocking a chemical signal that causes your intestinal muscles to contract. These are taken multiple times a day and your doctor will typically start at a low dose, so they’re worth asking about if flares are a recurring problem for you.
Managing Diarrhea During a Flare
For diarrhea-dominant flares, loperamide (the active ingredient in Imodium) slows gut motility and lets your intestines absorb more water. The standard approach for adults is two capsules after the first loose bowel movement, then one capsule after each subsequent loose stool, up to a maximum of eight capsules in a day. It’s meant for short-term use to get you through the worst of a flare, not as a daily strategy unless your doctor recommends otherwise.
Soluble fiber can also help firm up loose stools. Psyllium husk (found in products like Metamucil) and oat bran absorb water in the gut and add bulk. Insoluble fiber, on the other hand, can make diarrhea worse, so during a flare you’ll want to avoid bran flakes, raw vegetables with tough skins, and whole wheat products. Stick with the soluble sources until things settle down.
Managing Constipation During a Flare
If constipation is your main symptom, the American Gastroenterological Association recommends polyethylene glycol (PEG) laxatives, sold as MiraLAX and similar brands. PEG works by pulling water into the colon to soften stool, and it’s generally well tolerated for the short stretches of a flare. Soluble fiber helps here too. Psyllium adds bulk that gives your colon something to push against, which can get things moving. Start with a small amount and increase gradually, because adding too much fiber at once can increase bloating.
Strip Your Diet Back to Basics
During an active flare, simplifying what you eat makes a real difference. The low-FODMAP approach is the most evidence-backed dietary strategy for IBS. FODMAPs are short-chain carbohydrates that ferment in your gut, drawing in water and producing gas. Cutting them out temporarily reduces the raw material your gut bacteria have to work with, which calms bloating, pain, and irregular bowel habits.
Safe foods during a flare include plain-cooked meats, tofu, eggs, rice, oats, and low-FODMAP fruits like grapes, strawberries, and pineapple. Bananas are fine if they’re not fully ripe (the riper they get, the higher the fructose content). Foods to avoid include apples, watermelon, stone fruits like peaches and plums, most legumes, processed meats, garlic, onion, and wheat-heavy products.
You don’t need to stay on a strict elimination diet forever. The standard protocol is two to six weeks of elimination, followed by a gradual reintroduction phase where you test one FODMAP category at a time over roughly eight weeks. The goal is to figure out your personal triggers so you can eat as broadly as possible between flares. Working with a dietitian for the reintroduction phase helps, since the process is more structured than it sounds.
Use Breathing to Quiet Your Gut
This one sounds too simple, but the connection between your brain and your gut runs through the vagus nerve, and you can directly influence it with your breathing. Diaphragmatic breathing activates the vagus nerve, which switches your nervous system from its stress response into its relaxation mode. That shift reduces gut motility and can ease cramping within minutes.
To do it: lie on your back and place one hand on your stomach above your belly button, the other on your chest. Breathe in slowly through your nose and focus on pushing your stomach hand up while keeping your chest hand relatively still. Exhale slowly through pursed lips. Five to ten minutes of this during a pain spike can noticeably reduce the intensity. It’s also worth practicing regularly between flares, since chronic stress is one of the most common flare triggers.
What Triggers Flares in the First Place
Knowing your triggers is the best long-term prevention. The two most consistent culprits are stress and food. Stress doesn’t just make you more aware of gut symptoms; it physically changes how fast your intestines contract and how sensitive your gut nerves are. High-FODMAP foods, large meals, alcohol, and caffeine are common dietary triggers, though they vary widely from person to person.
Keeping a symptom diary that tracks what you ate, your stress level, sleep quality, and menstrual cycle (if applicable) can reveal patterns that aren’t obvious in the moment. Most people find they have three to five reliable triggers once they look at enough data.
Symptoms That Aren’t Typical IBS
IBS flares are uncomfortable but not dangerous. Certain symptoms, however, suggest something else may be going on and warrant a call to your doctor. These include rectal bleeding, unexplained weight loss, fever, persistent vomiting, diarrhea that wakes you from sleep, belly pain that isn’t connected to bowel movements or that occurs at night, and anemia. New onset of symptoms after age 50 also raises a flag. None of these are characteristic of IBS, and they typically prompt additional testing to rule out inflammatory bowel disease, celiac disease, or other conditions.