An irritable bowel syndrome (IBS) flare (sometimes called an “IBS attack”) can feel urgent and unpredictable, but it usually follows a pattern: abdominal pain or cramping plus changes in bowel movements (diarrhea, constipation, or both). IBS is considered a disorder of brain gut interaction, meaning stress, sleep, food, and the nervous system can all affect gut symptoms. This plan is educational, not medical advice, and it can help organize what to try in the next 24 to 72 hours and what information to collect for a clinician. [1]
The next 24 hours: calm the gut and simplify inputs
In the first day of a flare, the goal is often to reduce “noise” for the digestive system and lower the stress-urgency loop. A simple reset can start with the basics: regular meals (rather than skipping), eating slowly, and choosing foods and drinks that are less likely to irritate the gut. Many IBS care resources encourage keeping a food-and-symptom diary to spot personal IBS flare triggers over time, because triggers vary widely across people. [2]
A practical 24-hour flare plan can look like this:
Hydration first: Sipping water or other non-caffeinated fluids through the day can be a helpful foundation, especially when diarrhea is part of the flare.
Go “gentle and boring” with meals for a day: Smaller, simpler meals are often easier to tolerate than large, rich meals.
Pause common irritants (as tolerated): High-fat, spicy, and heavily processed foods, and products sweetened with sorbitol are common culprits for symptom worsening in IBS education materials. Caffeine can also be a trigger for some people.
Match the plan to the flare type:
Diarrhea flare plan: Focus on hydration, simpler meals, and noting urgency timing (morning, after meals, during anxiety spikes).
Constipation flare plan: Fluids still matter, and some people find soluble fiber foods (for example, oats) are gentler than rough, grainy fibers.
Nervous system downshift: Relaxation practices (quiet breathing, body scans, gentle stretching) can be paired with a warm pack on the abdomen for comfort, when appropriate.
If over-the-counter medicines are being considered during a flare, many public health resources recommend discussing options with a pharmacist, since the best choice depends on symptoms and personal health history.
The next 24–72 hours: rebuild a routine, reduce anxiety, and know when to contact a clinician
Between days 2 and 3, the focus can shift toward consistency and learning. IBS symptoms often improve when routines are steadier: regular sleep, regular meals, and a realistic plan for stressful times (commutes, meetings, social events). Anxiety and bowel urgency can reinforce each other, so building a short “calm script” can help, for example: pause, slow breathing for 2 minutes, sip water, then reassess. Some clinical guidelines also support gut-directed psychotherapy (such as cognitive behavioral therapy-style approaches tailored to GI symptoms) as a tool that can improve overall IBS symptoms over time. [3]
This is also the window to decide what needs follow-up rather than more self-experimenting:
If flares are frequent: A clinician or registered dietitian may suggest structured strategies, such as a time-limited trial of a low FODMAP (fermentable oligosaccharides, disaccharides, monosaccharides and polyols) approach, which is designed to identify specific food triggers and then reintroduce foods based on tolerance.
If constipation is a repeating pattern: Asking about soluble fiber strategies can be reasonable, since guidelines distinguish soluble fiber from fibers that may worsen bloating for some people.
When to contact a clinician urgently: IBS should not cause fever, rectal bleeding, unexplained weight loss, vomiting, severe pain, or diarrhea that wakes someone from sleep. These “red flag” symptoms deserve prompt medical attention because they can suggest something other than IBS. [4]
To make the next flare easier to manage, the most useful quick win is documentation: Start a flare log in Aidy with meals, stress, sleep, bowel pattern, and what helped or worsened symptoms.