The common causes of weight loss are: 1. Insufficient food intake, including: (1) food shortage, food preference or weight loss caused by improper nutritional structure. (2) The weight loss caused by eating or swallowing difficulty is common in oral ulcer, mandibular arthritis, osteomyelitis and esophageal tumor. (3) Anorexia or emaciation caused by anorexia are common in anorexia nervosa, chronic gastritis, adrenal cortex dysfunction, acute and chronic infections, uremia and malignant tumors. 2. Obstacles in digestion, absorption and utilization of food include: (1) Chronic gastrointestinal diseases are common in gastrointestinal diseases, such as duodenal ulcer, chronic gastritis, gastroptosis, gastrointestinal tumor, colitis, intestinal tuberculosis, Crohn's disease. (2) Chronic hepatobiliary and pancreatic diseases, such as chronic hepatitis, cirrhosis, liver cancer, chronic biliary tract infection, chronic pancreatitis, gallbladder and pancreatic tumors. (3) Endocrine and metabolic diseases such as hyperthyroidism, diabetes, etc. (4) Chronic consumptive diseases, such as tuberculosis. (5) Others, such as taking some laxatives or drugs that are irritating to the gastrointestinal tract. It is suggested that the hospital should see a doctor for further diagnosis and treatment.
