Edema is not necessarily a kidney disease, and kidney disease does not necessarily cause edema. Edema can be seen in heart disease, liver disease, kidney disease, malnutrition, endocrine disease, allergic reactions and idiopathic edema. Therefore, edema is not necessarily a kidney problem, but should be noted that there are diseases of organs or systems other than the kidneys. For some special occupations that require long-term standing and sedentary legs, edema of both lower extremities can also be caused by poor local tissue fluid reflux, which can be identified by urine routine in general. Idiopathic edema is usually seen in women of childbearing age or before and after menopause, childbearing age is related to menstruation can appear in the days before and after menstruation, in a cyclical manner, and can also appear in women before and after menopause, but this diagnosis should exclude cardiac, hepatic and renal malnutrition endocrine factors.