Heartburn may be caused by gastric ulcer, gastritis, reflux esophagitis and other diseases. 1. Gastric ulcer: Gastric ulcer may be caused by Helicobacter pylori infection, smoking, alcoholism, improper diet and other factors. Patients may experience loss of appetite, stomach bloating, stomach pain, postprandial bloating and other symptoms, which are manifested as bloating and heartburn. 2. Gastritis: Causes of gastritis include burns, drugs, trauma, alcohol, Helicobacter pylori infection, low immunity, and alcohol consumption. Symptoms include epigastric pain, bloating, nausea, belching, acid reflux, etc. Some patients may have heartburn. 3. Reflux esophagitis: Heartburn may also be caused by reflux esophagitis, the cause of which is related to the decline of anti-reflux function, the decrease of esophageal clearance ability, the weakening of the esophageal mucosal defense barrier, and esophageal sensory abnormalities, etc. Typical symptoms include heartburn, reflux and heartburn. Typical symptoms are heartburn and reflux, and some patients may be accompanied by belching and epigastric fullness. There are many reasons that lead to heartburn in patients with gastric distension, and it is recommended that patients identify the causes of the disease in a timely manner and actively cooperate with doctors to take relevant treatment measures.