Which of the following is NOT a common cause of stomach ulcers?

Stomach ulcers, also known as peptic ulcers, are primarily associated with specific factors that irritate the stomach lining. H. pylori, a type of bacteria, is well-known for its role in causing ulcers as it can damage the protective mucosal layer, allowing stomach acid to harm the tissue underneath. Nonsteroidal anti-inflammatory drugs (NSAIDs), which include medications like aspirin, can also lead to ulcers by disrupting the production of prostaglandins that normally help protect the stomach lining from acid.

Acetaminophen, however, is not commonly associated with the development of stomach ulcers. It primarily acts as a pain reliever and fever reducer and does not have the same gastrointestinal side effects as NSAIDs. While any medication can have potential side effects, acetaminophen is generally considered safer for the stomach when compared to nonsteroidal anti-inflammatory drugs and does not contribute to ulcer formation in the same way that H. pylori, aspirin, and NSAIDs do. This distinction underscores the role of specific medications and pathogens in ulcer causation and highlights why acetaminophen is not typically identified as a common cause of stomach ulcers.