Graphic title: 'Reducing SIBO Die Off Symptoms' with a person clutching their stomach and a small The Healthy RD logo in the corner.

SIBO Die-Off Symptoms: Why You Feel Worse Before You Feel Better (2026 Update)

Quick answer: SIBO die-off (also called a Herxheimer reaction) is a temporary flare of gas, fatigue, headaches, or skin changes that happens when antibiotics or herbal antimicrobials start killing off the bacteria overgrowing in your small intestine. It typically peaks in 2–4 days and resolves within a week. You can reduce it by hydrating well,

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