Chronic mucositis is a pathologic diagnosis, and Gastroenterology generally refers to chronic inflammation of the gastric mucosa, duodenal mucosa, and esophageal mucosa, which is mildly damaged but requires attention and treatment. Chronic mucositis is relatively mild damage, usually only damage to the mucosal surface, often found in pathologic biopsy of the lesion, although the damage is mild, but need attention and intervention, otherwise may cause further lesions. Intervention is twofold and is primarily pharmacologic and dietary. Drugs can be used such as omeprazole, magnesium aluminum carbonate, and Rehabilitation New Liquid, all of which can effectively protect the gastric mucosa and reduce gastric mucosal damage. In addition, we should pay attention to adjust the lifestyle, eat more fresh fruits and vegetables, avoid eating greasy stimulating food. Medications should be used under the guidance of a doctor, and should not be used without authorization.