Fifty-year-old woman leg swelling a pit when pressed is usually more serious. Swollen legs can be caused by cardiac insufficiency, renal insufficiency, lower extremity venous thrombosis and other reasons. 1. Cardiac insufficiency: If cardiac insufficiency or heart failure occurs, venous blood return to the heart will be hindered. After that, it may cause the venous pressure to rise, leading to the continuous pooling of venous blood in the interstitial space of the tissues, thus leading to leg swelling with a single press. 2. Renal insufficiency: the kidneys are mainly for the metabolism of water and electrolytes, due to the decline in kidney function, the body is not able to discharge excess water in a timely manner, there is water and sodium retention caused by swelling of the legs. This leads to leg swelling and a pit when pressed. 3. Lower extremity venous thrombosis: the presence of thrombus in the lower extremity veins will lead to lower extremity venous blood flow to the heart is affected, resulting in increased pressure in the lower extremity veins, blood seepage through the blood vessel wall to the tissue interstitial space will cause swelling of the legs, resulting in swelling of the legs by a press a pit. It is recommended that when a woman in her fifties has a swollen leg, she should go to the hospital in time to find out the cause of the disease and then standardize the treatment.