There are more lesions causing lower limb edema, so it is difficult to identify them. Cardiogenic edema, which is mainly a manifestation of right heart failure, first appears locally and can extend upward to the whole body. It is often accompanied by jugular vein anger, hepatomegaly and other symptoms. Nephrogenic edema is seen in various types of nephritis and nephropathy, in which it is mostly morning eyelid and facial edema, which can later develop into generalized edema. It is often accompanied by abnormal urinalysis, hypertension, and renal impairment. 2. Hepatogenic edema is seen in hepatic decompensation, where a large amount of ascites appears first, followed by edema of the lower extremities due to protein depression. 3. It is sunken edema, which occurs in the lower extremities, the front area of the neck, and also around the orbits; 5. Premenstrual tension syndrome, which mainly occurs 7-14 days before menstruation with mild edema of the eyelids, ankles and hands, may be accompanied by breast pain, and the edema can gradually subside after menstruation; 6. Calcium antagonists can cause edema; 7. Idiopathic edema, the cause of which is unknown, suddenly presents swelling of bilateral limbs. It is mostly seen in women and may be related to endocrine dysfunction and is cyclic edema. 8. Edema caused by localized lesions. The edema is caused by the obstruction of blood return and lymphatic drainage in the lower limbs of the body. Lymphatic edema is more serious, called rubbery legs; 9. edema caused by venous obstruction, venous obstruction is divided into inferior vena cava obstruction can cause edema of both lower limbs, called Buga syndrome. Another condition is edema caused by bilateral iliac veins, femoral veins and other lower limb deep vein thrombosis, and another condition applies to edema caused by venous valve insufficiency. These edemas are more serious and require prompt hospital consultation.