Reference entry

SIBO

Plain-English definitions of microbiome research vocabulary — the terms you'll see across articles, testing services, and probiotic claims.

Glossary context

Defined

in the site-wide microbiome glossary

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Definition

Small Intestinal Bacterial Overgrowth. A condition where excessive bacteria colonise the small intestine (which normally has relatively few), causing bloating, pain, and malabsorption.

Related terms

Dysbiosis

An imbalance in the composition or function of the microbiome, typically characterised by reduced diversity, loss of beneficial bacteria, or overgrowth of potentially harmful species.