Edema of the lower extremities is defined as a pit on the leg when pressed. Depending on the cause of the edema and the accompanying symptoms, the appropriate department can be selected. Common causes of lower limb edema include heart failure, nephrotic syndrome and hyperthyroidism. 1. If lower limb edema is accompanied by chest tightness, dyspnea, palpitations, etc., there is a history of heart disease, which may be caused by heart failure, and should be referred to the Department of Cardiology; some hospitals do not have the Department of Cardiology, so they can be referred to the Department of Internal Medicine. 2. If accompanied by abnormal urine output, high foam in urine, high blood pressure, etc., it may be nephrogenic edema, such as nephrotic syndrome, etc., and it is recommended to consult the nephrology department. 3. If accompanied by protruding eyeballs, abnormal mood, tremor and sweating, etc., it may be caused by hyperthyroidism, and it is recommended to go to the Department of Endocrinology for consultation. Lower limb edema may also be caused by other reasons, and you can choose to consult the appropriate department according to the accompanying clinical symptoms or medical history. You can also ask the nurse practitioner when you go to the hospital, and follow the advice of the nurse practitioner to choose a department to register.