Peptic ulcer is a common and frequent clinical disease. If ulcer disease is not diagnosed and treated in time, complications may occur, which are far more serious than ulcer disease and sometimes can even be life-threatening, such as ulcer bleeding, ulcer perforation, pyloric obstruction, ulcer carcinoma, etc. Therefore, it is necessary for us to learn about peptic ulcers to prevent them from occurring. First, let’s understand the structure of the digestive system: The digestive system consists of two major parts: the digestive tube and the digestive glands. The digestive tube includes the oral cavity, pharynx, esophagus, stomach, small intestine (duodenum, jejunum, ileum) and large intestine (cecum, colon, rectum, anal canal). The section from the mouth to the duodenum is often referred to as the upper gastrointestinal tract, while the part below the jejunum is called the lower gastrointestinal tract. There are two types of digestive glands: small and large. The small digestive glands are scattered in the walls of the various parts of the digestive duct, while the large digestive glands include three pairs of salivary glands (parotid, submandibular, and sublingual), the liver, and the pancreas. The basic function of the digestive system is to be responsible for the digestion and absorption of food, providing the body with the necessary substances and energy. Except for vitamins, water and inorganic salts, which can be absorbed and used directly, proteins, fats and sugars cannot be absorbed and used directly by the body, but must be broken down into small molecules with simple structures in the digestive tube. The process of breaking down food into small, simple, absorbable molecules in the digestive tract is called digestion. The process by which these small molecules pass through the mucosal epithelium of the digestive tube into the blood and lymphatic fluid is called absorption. For the unabsorbed residual fraction, the digestive tract passes through the large intestine and is excreted in the form of feces. Digestion is divided into mechanical digestion and chemical digestion. Mechanical digestion is the process of grinding the food through the contraction of the muscles of the walls of the digestive tube, so that the food is mixed with the digestive juices and the digested food components are in close contact with the walls of the digestive tube to facilitate absorption, and the undigested food residues are excreted from the end of the digestive tract. Chemical digestion is a process in which food is chemically broken down by digestive juices secreted by the digestive glands to make it into small molecules that can be absorbed. Under normal circumstances, mechanical digestion and chemical digestion occur simultaneously and in conjunction with each other. Gastric ulcers and duodenal ulcers are generally referred to collectively as peptic ulcers, sometimes abbreviated as ulcers. The stomach acid (hydrochloric acid) and pepsin (a type of enzyme), which originally digest food, digest their own stomach wall and duodenal wall due to various factors but damage the mucosal tissue, which is the main cause of peptic ulcer. These influencing factors are mainly: 1. Helicobacter pylori infection causes the main cause of chronic gastritis, with a positivity rate of 90-100%. After the eradication of HP, chronic gastritis with ulcer disease recurrence rate can be less than 10%. 2, genetic factors gastric ulcer patients in the family, the incidence of gastric ulcer is three times higher than normal; and in the family of patients with duodenal ulcer, more often occur in duodenal ulcer rather than gastric ulcer. 3.Drug factors such as anti-inflammatory pain, POTUS, aspirin, adrenocorticotropic hormone, fluorouracil, methotrexate, etc. are listed as ulcer-causing factors. 4, environmental factors smoking can stimulate increased secretion of gastric acid, generally doubled than non-smokers. 5, food factors food to the gastric mucosa can cause physical and chemical properties of damage. Overeating or irregular eating can disrupt the rhythm of gastric secretion. Coffee, strong tea, strong alcohol, spicy seasonings, kimchi and other foods, as well as paranoid eating, eating too fast, too hot, too cold, overeating and other bad eating habits, may be the relevant factors for the occurrence of the disease. 6, mental factors peptic ulcer belongs to one of the typical psychosomatic disease category, tension, worry, sadness, anger and other negative factors can affect the secretion of gastric juice.