Irritable Bowel Syndrome (IBS-D, diarrhoea-predominant)
Understanding diarrhoea-predominant IBS through community experiences and medical research.
Community experiences, not medical advice
Understanding diarrhoea-predominant IBS through community experiences and medical research.
Irritable Bowel Syndrome with Diarrhoea (IBS-D) is a functional gastrointestinal disorder that affects the large intestine. It is characterized by abdominal pain, bloating, and frequent loose or watery bowel movements without an identifiable organic cause.
Rome IV describes IBS as a functional bowel disorder: tummy pain that keeps coming back, together with a change in how often you go or what your stool looks like. IBS-D is the pattern where diarrhoea is the main bowel-habit change. You can read the Rome IV bowel-disorders paper by Mearin, Lacy and colleagues on PubMed.
Based on experiences shared in our community:
Staudacher and colleagues randomised adults with IBS (Rome III; mixed subtypes, not IBS-D only) to a low-FODMAP diet or a sham diet. In the intention-to-treat analysis, 57% on the low-FODMAP diet reported adequate symptom relief versus 38% on the sham diet (p=0.051).
View on PubMedWedlake and colleagues (2009) found SeHCAT retention below 10% in 32% of people with IBS-D-type symptoms (95% CI 29–35). Among those with SeHCAT below 10%, 80% responded to a bile acid binder. That 80% figure is the binder response at SeHCAT <10%, not “75% of IBS-D”. Guts UK describes bile acid diarrhoea as a condition that can be mistaken for IBS-D.
The AGA 2019 guideline (Smalley and colleagues) suggests testing for bile acid diarrhoea if you have chronic diarrhoea. That suggestion is conditional and based on low-quality evidence. In the UK the usual test is a SeHCAT scan.
View on PubMed View AGA 2019 on PubMedThe ACTIB trial (Everitt et al., Gut 2019) compared telephone-delivered and web-delivered CBT with treatment as usual in adults with refractory IBS — clinically significant symptoms for 12 months or more despite first-line therapies — not an IBS-D-only sample. Both CBT arms were superior to treatment as usual for IBS symptom severity and work and social adjustment at 12 months.
View on PubMedThe ACG 2021 IBS guideline (Lacy and colleagues) recommends a limited trial of a low-FODMAP diet and suggests gut-directed psychotherapy — including gut-focused cognitive-behaviour therapy — for global IBS symptoms. If you try a short, dietitian-supported diet trial or CBT aimed at the gut, that is what this guideline suggests — not a guarantee.
View on PubMedThese are options clinicians and guidelines discuss — not a self-treatment plan.
Comprehensive overview of IBS-D symptoms, causes, diagnosis, and treatment options.
Visit ResourcePatient-centered information on IBS-D, with resources for managing symptoms and finding support.
Visit ResourceEvidence-based information on the low FODMAP diet, which has shown significant benefits for many IBS-D patients.
Visit ResourceReal stories shared by our community members about managing diarrhoea-predominant IBS.
"The low-FODMAP diet was a game-changer for me. After completing the elimination phase with a dietitian, I discovered that onions, garlic, and certain fruits were my biggest triggers. I also found that a daily probiotic (specifically Saccharomyces boulardii) helps regulate my digestion. For acute episodes, peppermint oil capsules provide quick relief from cramping and urgency."
"Stress management has been the most important factor for me. I practice mindfulness meditation daily and use diaphragmatic breathing during flare-ups. I've also found that regular exercise—particularly yoga—helps regulate my gut function. Diet-wise, I avoid caffeine completely and limit alcohol to rare occasions. Soluble fiber supplements (psyllium husk) taken with plenty of water have helped firm up my stools."
"After years of trial and error, I've found that a combination approach works best. I take a low-dose antispasmodic (dicyclomine) before meals that I know might be problematic. I've eliminated dairy completely and limit processed foods. Keeping a consistent meal schedule and never skipping meals has been crucial. I also use Imodium preventatively before situations where bathroom access might be limited."