There are three degrees of edema according to the degree of edema: mild, moderate and severe. Clinical significance: Mild edema is mostly seen in the eyelids, face, anterior tibia, ankles, etc. After acupressure, mild tissue depressions can appear, and recovery is faster, and sometimes early edema only shows rapid weight gain without the characteristics of edema. Moderate edema: edema can be found in loose tissues all over the body, and obvious or deep tissue depression can appear after acupressure, and recovery is relatively slow. Severe edema: the whole body tissues are severely edematous, the skin of the low hanging parts of the body is tense and shiny, and there can even be fluid exudation, and some can be accompanied by pleural effusion, peritoneal effusion, sphincter effusion, etc.