Abdominal bloating and weight loss may be caused by chronic gastritis, gastric ulcer, digestive tract tumor and other reasons. 1. Chronic gastritis: gastric mucosal damage exists in the state of inflammation and erosion, affecting the digestion of food, resulting in abdominal distension, unable to fully absorb the nutrients in the food, so the body is thin, accompanied by acid reflux, nausea and other symptoms. 2. Gastric ulcer: the protective barrier of gastric mucous membrane is damaged and there is ulcerated surface, which has poor digestive ability and also leads to bloating, nausea, acid reflux, due to less absorption of nutrients from food, which can not satisfy the need to provide enough energy, and so the body loses weight. 3. Tumor of digestive tract: stomach cancer, colon cancer, rectal cancer, etc. are high consumption diseases, which not only need to consume high calories, but also affect the digestion of food, leading to abdominal distension, body wasting, bloody stool and other symptoms. If you suffer from abdominal bloating and weight loss, it is recommended that you consult a doctor in time to find out the cause of the disease and treat it as soon as possible under the guidance of a physician, so as to avoid delaying your condition.