Not really. Peptic ulcers are erosions or breaks in the mucosal lining of the digestive tract. They can be caused by excessive mechanical irritation or infection. If you have an ulcer and you drink coffee, the coffee is acidic and can irritate the ulcer, but it doesn't necessarily cause the ulcer. Ulcers have been found to be caused by a toxin called urease released by the bacteria Helicobacter pylori and is easily treatable with antibiotics. If left untreated, it can lead to stomach cancer.
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