Back fat accumulation may be related to obesity, Cushing’s syndrome, mucosal edema and other factors. 1. Obesity: mainly related to life habits, heredity, hyperinsulinemia, abnormal thyroid function and other factors. (1) Lifestyle habits: mainly manifested as improper diet and lack of exercise. Improper diet is reflected in the excessive intake of high oil, high sugar, low nutrient content of junk food, resulting in excess energy, which is transformed into fat accumulation in the body, lack of exercise will also lead to the accumulation of fat in the body, the body metabolism function declines, triggering obesity. (2) Heredity: obesity is often a family aggregation, if in the family or parents have obese people, the children will increase the chance of obesity. 2. Cushing’s syndrome: the patient’s body has too much glucocorticoid hormone, resulting in elevated cortisol content in the blood circulation, resulting in disorders of body fat metabolism. It is characterized by centripetal obesity, and may appear as a thick back. 3. Mucosal edema: back fat accumulation may also be related to hyperinsulinemia, mucosal edema caused by abnormal thyroid function and other factors. It is recommended to consult a doctor in case of back fat accumulation and follow up with targeted treatment under the guidance of a specialist.