Peptic ulcer is a common and frequently occurring upper gastrointestinal disease. The most likely cause may be infection by Helicobacter pylori, with other potential causes including irritation from smoking and alcohol, poor dietary and living habits, severe psychological stress, or medications, among others. The primary change is usually an excessive secretion of gastric acid, which irritates the gastric mucosa leading to self-digestion and the appearance of gastric or duodenal erosion and ulcers. Clinically, it often presents as long-term, periodic, rhythmic upper abdominal pain, which may be located in the upper left abdomen or slightly right of the navel, and is often accompanied by regurgitation, belching, acid reflux, nausea, etc. If there is ulcer bleeding, it often presents as black stools or even vomiting blood, among other symptoms.