Found a great article on serious side effects of drinking coffee - here are a few of them:
1. Coffee and Hydrochloric Acid
Drinking coffee on an empty stomach, such as first thing in the morning, stimulates hydrochloric acid production. This can be a problem because HCl should only be produced to digest meals.
2. Ulcers, IBS and Acidity
Many of the compounds in coffee like caffeine and the various acids found in coffee beans can irritate your stomach and the lining of your small intestine. It’s known to be a problem for those suffering from ulcers, gastritis, IBS and Crohn’s disease and doctors generally advise patients with these conditions to avoid coffee completely.
3. Heartburn Problems
Acid reflux and heartburn can be caused by coffee due to the way it relaxes the lower esophageal sphincter. This small muscle should remain tightly closed once you’ve eaten to prevent the contents of your stomach from coming back into the esophagus and burning its delicate lining with hydrochloric acid.

Read the rest of the article here
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