What diseases may weight loss be related to? 1. Digestive system diseases: such as chronic gastritis, peptic ulcer, malabsorption syndrome, chronic diarrhea, etc. These diseases will reduce digestion and absorption function and reduce nutrient intake. It is characterized by long-term gastrointestinal symptoms such as stomach pain, nausea and vomiting, anorexia, diarrhea, abdominal distension and gradual weight loss. It should be noted that spiramycin, erythromycin, aspirin, paracetamol, tetracycline and many other drugs have strong gastrointestinal side effects, which affect eating. Therefore, emaciation with digestive tract symptoms should be examined by gastroscope, colonoscopy and barium meal according to the situation, so as to make a clear diagnosis and exclude drug factors. Hepatobiliary and pancreatic diseases affect the secretion and composition of digestive juice, and also affect the digestion and absorption of food, leading to emaciation. 2. Severe fever and dehydration: Due to the high energy consumption, high fever can make people lose weight quickly. Dehydration caused by severe diarrhea, burns, vomiting, etc. Can reduce the water inside and outside the cell, showing emaciation. This kind of emaciation has obvious reasons, and it is rapidly emaciated in a short time. 3. Tuberculosis: Tuberculosis is a typical wasting disease, which gradually becomes emaciated in the later stage, accompanied by hot flashes, night sweats, cough and hemoptysis. 4. Tumor: In the late stage of tumor, emaciation occurs due to excessive physical exertion. Therefore, any unexplained progressive wasting should be examined to exclude malignant tumors. 5. Diabetes: In the later stage, because sugar can't be used well and is excreted from urine, it gradually loses weight. 6. Hyperthyroidism: This cause is that it is in a state of high metabolism for a long time, consuming too many calories and running out. Emaciation is a characteristic of many diseases, and it is easy to be found by others or patients themselves. Once this body shape change occurs, patients and their families should pay attention to it.