The original weight of 176 pounds height 1.65, just after six months of 130 pounds, may be caused by diseases, such as hyperthyroidism, diabetes, etc.; may also be caused by physiological factors. ⒈ physiological factors: if the usual excessive exercise, excessive dieting, excessive tension and anxiety, easy to lead to weight loss very quickly, should be reasonable exercise, rational arrangement of diet, maintain a positive state of mind, to avoid unhealthy habits, so as not to affect the health of the body. Peculiar factors of pathology. Hyperthyroidism: this disease is an endocrine disease, which will lead to a high metabolic state of the body and excessive calorie consumption, which will lead to rapid weight loss and so on. Diabetes mellitus: due to the patient’s glucose utilization disorder, when the blood sugar is too high, a large amount of glucose will be excreted with the urine, the body will be through the decomposition of fat to supply energy, resulting in the occurrence of rapid weight loss. If the weight loss is too fast, after excluding physiological factors, you should go to the hospital in time to find out the cause of the disease and treat the cause.