Why Do I Feel Nauseous After Drinking Coffee?
Coffee can trigger nausea through several mechanisms in your digestive system. Caffeine stimulates acid production in your stomach, which can cause irritation and nausea, especially on an empty stomach. The acidity of coffee (pH around 5) can also directly irritate your stomach lining. Additionally, caffeine affects your central nervous system and can overstimulate your vagus nerve, which controls digestion. Some people are more sensitive to coffee's compounds like chlorogenic acids or may experience withdrawal symptoms if they're irregular coffee drinkers. Drinking coffee too quickly, consuming it on an empty stomach, or having too much caffeine (over 400mg daily) increases nausea risk.
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