What causes increased acid in stomach?

An increased stomach acid production can result from nervousness, tension, rage or fear. Brain activity can stimulate the nerves that control acid production. Acid formation is also increased with smoking and the consumption of alcohol. Ulcer patients who insist on smoking and drinking literally pour increased amounts of acid on the internal wounds. Part of the symptoms of a hangover result from stomach irritation that produces congestion or even small ulcers.

There is also a large group of people who don't seem to worry inordinately and are abstainers but who also get ulcers. We obviously don't know all the answers.