The common reasons for the buttocks to become bigger are obesity or sedentary, etc., which may also be caused by genetic factors or disease factors. 1. Obesity: If the body is relatively obese, usually the fat in the buttocks area will also be more, so it will look bigger. 2. Sedentary: If you are often sedentary, it may also cause your buttocks to look bigger. 3. Genetic factors: some people have a large buttocks usually related to genetic factors, such as the presence of large buttocks in the family, the offspring may also have this situation. 4. Disease factors: If you suffer from certain diseases, such as cortisolism, it may make the fat increase in the buttocks area, which leads to the buttocks look bigger. Butt big suggestion actively to the regular hospital for relevant examination, clear diagnosis, and then targeted treatment, usually routine to regular, but also to scientific and reasonable diet, avoid overeating.