Symptoms of intestinal ulcers include abdominal pain, nausea and vomiting, black stools, and perforation. 1. Abdominal pain: most of the pain is mainly in the lower abdomen, which may involve the whole abdomen. The pain can be colicky or distending, which can be aggravated after eating and relieved after passing gas or defecation. 2. Nausea and vomiting: Due to the abnormal peristalsis and digestive function of the intestines caused by intestinal ulcers, nausea, vomiting, loss of appetite and other symptoms may occur. 3. Black stool and blood in stool: If the intestinal ulcer invades the blood vessels of the intestinal mucosa, it may lead to rupture of the blood vessels and bleeding, which may be manifested as black stool or blood in stool. 4. Perforation: If the intestinal ulcer is further aggravated, it can penetrate the intestinal wall and cause perforation, resulting in acute abdomen, which is characterized by abdominal pressure and abdominal platysma. For the symptoms of intestinal ulcers, it is recommended to be diagnosed by a doctor in the light of the individual’s condition.