Weight gain instead of weight loss may be related to diet. In addition, insufficient exercise, slowing down of metabolism, and suffering from certain diseases may cause weight gain, so it is recommended to consult a doctor. 1. Diet-related: such as overeating, eating high-calorie food, etc., so that excess calories, body fat accumulation, causing weight gain symptoms. 2. Insufficient exercise: Lack of exercise or insufficient exercise in general, coupled with failure to control diet after exercise, may cause weight gain. 3. Suffering from certain diseases: such as hypothyroidism, cirrhosis ascites, pleural effusion, etc., there may be symptoms of weight gain, if accompanied by edema, weakness and other symptoms, you can go to the due for further examination to confirm the diagnosis, and now exclude pathological causes. After the discovery of persistent weight gain and the exclusion of physiological factors, it is recommended to seek timely medical treatment.