Which of the following is an adverse effect associated with Aspirin?

Aspirin is known to cause gastric irritation, which is a significant adverse effect associated with its use. This effect occurs because aspirin is a non-steroidal anti-inflammatory drug (NSAID) that inhibits the production of prostaglandins. Prostaglandins are compounds that help protect the stomach lining by stimulating mucus and bicarbonate secretion, which neutralizes stomach acid. When aspirin reduces prostaglandin levels, it can lead to irritation of the gastric mucosa, potentially resulting in gastritis, ulceration, and abdominal pain.

The other choices do not typically correlate with common adverse effects of aspirin. Increased appetite and dry mouth are not widely recognized as complications of aspirin use. Similarly, while sleep disturbances may arise from various factors, they are not a direct or commonly reported side effect of aspirin itself. Thus, gastric irritation stands out as a primary concern in patients taking aspirin, making it the correct answer in this context.