A causal relation between gastric stasis and gastric ulceration is suggested by the literature reviewed. In obstructive duodenal ulcer disease it is important to know that a concomitant gastric ulcer may be present and causing the symptoms. In combined ulcers, symptoms are more severe and treatment is more difficult.A clinical study of 60 cases of stasis gastric ulcer associated with chronic duodenal ulcer disease is presented. Twenty-six of these patients with gastric ulcers were bleeding at the time of their admission. The mortality rate was at least twice that for solitary ulcer. Early warning symptoms of stasis were fatigue, anorexia, fullness and weight loss; vomiting was a late manifestation. X-ray findings were often inaccurate; evidence of retention was reported in only 21. Gastric residue measurements were particularly useful in showing gastric retention.Since the basic disease in combined ulcers is the duodenal lesion, surgical treatment is primarily that for duodenal ulcer.