Postoperative edema may have the following specific factors: 1, infection: if there is local infection, the infection will form an inflammatory reaction, and the important clinical manifestation of inflammatory reaction is edema; 2, malnutrition: some surgeries, especially larger surgeries, such as visceral surgery, have a long operation time, relatively more intraoperative exudation, more serious human consumption, and the whole is in the process of emergency trauma, at this time, a large amount of albumin will be consumed, resulting in Low protein, thus causing tissue edema or even general edema, so it is necessary to supplement human albumin in time, plus diuretic drugs to correct edema; 3. Disorders of blood supply: for example, patients suffer from venous thrombosis or lymphatic duct obstruction, if this condition exists, it will generally cause distal edema in the corresponding area.