Why does coffee make you nauseated?

Caffeine sensitivity: Some people may be more sensitive to the effects of caffeine, which can lead to nausea. Caffeine can increase stomach acid production and stimulate the central nervous system, both of which can contribute to feelings of nausea.

Empty stomach: Drinking coffee on an empty stomach can irritate the lining of your stomach and cause nausea. The caffeine in coffee can also speed up the movement of food through your digestive tract, which can add to feelings of nausea.

Acid reflux: Coffee can relax the lower esophageal sphincter (LES), the muscle that prevents stomach contents from flowing back into the esophagus. This can lead to acid reflux, which can cause nausea and vomiting.

Certain medical conditions: Certain medical conditions, such as gastroesophageal reflux disease (GERD), irritable bowel syndrome (IBS), and Crohn's disease, can make you more likely to experience nausea after drinking coffee.

Dehydration: Coffee is a diuretic, which means that it can cause you to lose fluids. Dehydration can lead to nausea and other symptoms, such as headache, fatigue, and constipation.

Interactions with medications: Some medications can interact with coffee and cause nausea. These medications include certain antibiotics, antidepressants, and pain relievers.

Anxiety: Coffee can increase anxiety in some people, which can also lead to nausea.