Most of the swelling at night and recovery in the morning is caused by diseases, the more common are heart failure, kidney disease, liver disease, etc., partly due to long-term standing, blood reflux obstacles caused by. Swollen legs at night and recover in the morning, there are physiological and pathological two kinds. Pathologic causes are more common in heart failure, various acute and chronic nephritis, liver cirrhosis and other diseases. In addition, the abnormal function of the venous valves of both lower limbs can also be caused. Physiologic causes are more commonly found in decreased venous blood return due to prolonged standing. Edema can be reduced by elevating the lower limbs to promote blood return. If the above situation occurs repeatedly, it is necessary to go to the hospital to improve the urine routine, liver and kidney function, heart function and other related examinations, to clarify the cause of the disease and then treat the cause.