IBS-D vs. IBS-C vs. IBS-M: Understanding Your Subtype and Why It Matters

IBS is divided into three primary subtypes:

• IBS-D (diarrhea predominant)

• IBS-C (constipation predominant)

• IBS-M (mixed)

Understanding your subtype matters because research shows that treatments vary in effectiveness depending on bowel patterns.

IBS-D is associated with faster transit time, bile acid malabsorption (seen in up to 30% of IBS-D patients), and heightened urgency after meals. IBS-C often involves delayed transit, altered serotonin signaling, and stool that becomes hard to pass. IBS-M includes alternating patterns that can change weekly.

Each subtype responds differently:

• IBS-D treatments may involve bile acid binders, rifaximin, loperamide, or low-FODMAP intervention.

• IBS-C treatments may include osmotic laxatives, linaclotide, lubiprostone, or fiber adjustments.

• IBS-M requires adaptable strategies depending on the dominant pattern that week.

IBS Cite uses patient-reported data, test uploads, and symptom patterns to more accurately classify your subtype. This allows your guidance to feel much more personalized, reducing the trial-and-error that frustrates so many patients.