Patients who have demonstrated a gastric mucosal sensitivity to aspirin often react to other nonsteroidal, anti-inflammatory drugs to a similar or lesser degree. In a single-blind crossover study, five healthy volunteers who had previously developed erosive gastritis secondary to one week of aspirin therapy were randomly assigned to seven-day courses of treatment with ibuprofen, tolmetin and placebo. Treatment schedules were separated by washout periods to eliminate residual drug effects. Ibuprofen produced less gastric mucosal injury than tolmetin and, over all, appeared to be better tolerated. It was also noted that clinical symptoms often do not reflect the severity of gastroscopic findings, which may explain silent hemorrhaging in patients treated with agents of this type.