Why coffee can worsen an upset stomach

August 12,  2025

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Coffee is acidic, which can irritate the lining of the stomach and worsen symptoms like heartburn, acid reflux, or general stomach discomfort.

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Acidity

 Coffee stimulates the production of gastric acid (hydrochloric acid). If your stomach is already upset, extra acid can aggravate irritation or inflammation, leading to pain or discomfort.

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Stimulation of stomach acid

Coffee can speed up digestion and act as a mild laxative, which might worsen diarrhea or cramping if your upset stomach includes these symptoms.

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Laxative effect

The caffeine in coffee can increase stress hormones like cortisol, which might increase stomach discomfort or make nausea worse.

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Caffeine