Simple obesity can be seen at any age, juvenile type of obesity since childhood; adult type of more than 20 ~ 25 years of age; but the clinical 40 ~ 50 years of age of middle-aged women for the most, 60 ~ 70 years of age is not uncommon in the elderly. About 1/2 of adult obese people have a history of childhood obesity. Generally, there is a slow increase in body weight (except for women after childbirth), and a rapid increase in body weight in a short period of time should be considered secondary obesity. In men, fat distribution is dominated by the nape of the neck, trunk and head, while in women, the abdomen, lower abdomen, breasts and buttocks are dominated by the abdomen, lower abdomen, breasts and buttocks. Obese people are characterized by a short, fat, rounded body shape, narrow face, double chin, short, thick neck, backward head occipital skin folds thickened significantly. The chest is round, the rib gap is not visible, and the breasts are enlarged due to thick subcutaneous fat. When standing, the abdomen is projected forward and higher than the chest plane, and the umbilicus is deeply concave. In short-term obesity, purple or white stripes were seen on both sides of the lower abdomen, both thighs and the upper part of the inner side of the upper arm and the outer side of the buttocks. In obese children, the external genitalia are buried in the subcutaneous fat of the perineum, making the penis appear small and short. Fingers and toes are short and thick, and the back of the hand is thickened by fat so that the skin of the metacarpophalangeal joints is concave and the bony prominences are not obvious. Mild to moderate primary obesity can not have any self-awareness symptoms, severe obesity is more afraid of heat, reduced mobility, and even activities with mild shortness of breath, snoring during sleep. May have hypertension, diabetes, gout and other clinical manifestations. Obese patients with coronary heart disease, hypertension is significantly higher than the incidence of non-obese people, the incidence of which is generally 5 to 10 times higher than the non-obese people, especially the waist to hip ratio is high in the center of the obese patients. Obesity can lead to cardiac hypertrophy, posterior wall and septal thickening, cardiac hypertrophy accompanied by an increase in blood volume, intracellular and intercellular fluid, ventricular end-diastolic pressure, pulmonary artery pressure and pulmonary capillary wedge pressure are increased, part of the obese people have impaired left ventricular function and obesity cardiomyopathy. The incidence of sudden death is significantly higher in obese patients, which may be related to the occurrence of arrhythmias and cardiac ischemia caused by hypertrophy of the myocardium, fatty infiltration of the cardiac conduction system. Hypertension is very common in obese patients and is a major risk factor for aggravating cardiac and renal pathologies, and blood pressure will recover after weight loss. Obese patients have reduced lung capacity and decreased lung compliance, which can lead to a variety of lung function abnormalities, such as obesity hypoventilation syndrome, clinically characterized by lethargy, obesity, alveolar hypoventilation, often accompanied by obstructive sleep dyspnea. Severe cases can lead to pulmonary heart syndrome, due to the thickening of the abdominal cavity and chest wall adipose tissue accumulation, diaphragm elevation and reduce lung capacity, poor pulmonary ventilation, causing dyspnea after activity, severe cases can lead to hypoxia, cyanosis, hypercapnia, and even pulmonary hypertension leading to heart failure, such heart failure often poor response to cardiotonic agents, diuretics. In addition, severe obesity, but also can cause sleep apnea, occasionally see sudden death reports. Special tips: obese people with abnormal purine metabolism, plasma uric acid increases, so that the incidence of gout is significantly higher than normal, with coronary heart disease with a history of angina attacks. Obese people serum total cholesterol, triacylglycerol, low-density lipoprotein cholesterol is often elevated, high-density lipoprotein cholesterol decreased, easy to lead to atherosclerosis. Due to the impaired venous circulation, varicose veins of the lower extremities, embolic phlebitis, and venous thrombosis are prone to occur. Patients may have light purple lines or white lines on the skin, distributed in the outer buttocks, inner thighs, knee joints, lower abdomen, etc. The folds are easy to wear and tear, causing dermatitis, dermatophytosis, and even abrasion. Usually sweaty and afraid of heat, low resistance to infection.