Which of the following is NOT a side effect commonly associated with aspirin use?

The selection of diarrhea as the answer highlights that it is not a commonly recognized side effect of aspirin use. Aspirin is known to have a variety of side effects that stem from its action as a nonsteroidal anti-inflammatory drug (NSAID).

Ringing in the ears, also known as tinnitus, can occur due to aspirin toxicity, especially at higher doses. Heartburn is a frequent complaint among individuals taking aspirin, as it can irritate the stomach lining and lead to gastric discomfort. Bleeding is a well-documented side effect of aspirin because it inhibits platelet aggregation, increasing the risk of gastrointestinal bleeding and other hemorrhagic events.

Diarrhea, while it may occur due to various gastrointestinal issues or other medications, is not recognized as a typical side effect of aspirin itself. Therefore, identifying diarrhea as the option not commonly associated with aspirin use accurately reflects the understanding of the medication's side effects.