Common postoperative complications of gastric cancer include bleeding, gastroparesis, anastomotic necrosis, rupture of duodenal stump, postoperative obstruction and so on. 1. Bleeding: after surgery, due to poor anastomosis of stomach incision, stress ulcer caused by surgical stimulation, etc., there is a possibility that the wound will bleed, leading to vomiting blood, or black stool and other symptoms. 2. Gastroparesis: postoperative gastric cancer may lead to symptoms of gastroparesis, which is manifested as poor peristalsis of gastrointestinal tract, decreased appetite and so on. 3. Anastomotic necrosis: postoperative gastric cancer may cause postoperative ischemia and necrosis of gastrointestinal wall, as well as rupture of anastomosis or even perforation. 4. Postoperative obstruction: surgical stimulation may cause intestinal obstruction, resulting in no defecation, no gas and so on. When complications occur after gastric cancer surgery, one should go to hospital for examination as early as possible and take corresponding treatment measures in time.