Irritable Bowel Syndrome

Irritable Bowel Syndrome is indexed under Gastrointestinal, Functional GI Disorder. Also known as IBS, spastic colon.

US prevalence

~12% of people in the United States Source: NIDDK, Definition & Facts for Irritable Bowel Syndrome, last reviewed November 2017. Federal source. Label: VERIFIED.

ICD-10-CM codes

K58, K58.9

Typical onset

Typically before age 50; peak 20-40

Course

episodic

Body systems

gastrointestinal

Sex differences

F:M ~2:1 in Western countries

Racial and ethnic differences

Similar across races; cultural factors affect reporting

What this page does not establish

These figures describe populations, not individuals, and none of them is a diagnosis or a treatment recommendation. Prevalence estimates are approximate and reflect published ranges. Disparity figures are reported patterns, not causes.

Taxonomy last reviewed 2026-05-19. Each figure on the interactive page carries its own source and retrieval date, which can be later than this review.

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