Stomach Ulcers and Alcohol
Short answer: no, alcohol does not cause stomach ulcers. The acid reflux and gastritis alcohol causes may mimic stomach ulcer symptoms.
The vast majority of ulcers are caused by the H pylori bacteria. The only way to know for sure if H pylori is to blame for your ulcer is by taking an H pylori test.
While it is generally accepted that alcohol is not a cause of ulcers, it is well-established that alcohol can cause irritation and slow ulcer healing times. As a result, it is recommended that alcohol be avoided when recovering from a stomach ulcer.
Alcohol is known to cause gastroesphageal reflux disease (GERD), constipation, and other digestive disorders, but ulcers are not one of them.