Heel is the common name for the ankle, ankle swelling without pain may be due to physiological and pathologic two. 1. Physiological: due to prolonged standing and long-distance walking, or one side of the limb for a long time under pressure, so that the ankle blood reflux is impeded, so that the pressure in the blood vessels increased and infiltrated into the subcutaneous tissues, manifested as swelling and pain, after rest or change the position of the pressure can be gradually restored. 2. Pathological: Obstruction of lower limb reflux or increase of blood exudation caused by diseases can also occur, such as: cardiac insufficiency can cause obstruction of lower limb reflux, nephritis, cirrhosis of the liver can be due to hypoproteinemia can appear ankle swelling, need to correct the hypoproteinemia can be restored. If the ankle swelling is not obvious or aggravated after resting, you should go to the hospital in time, and the doctor will determine the specific cause of the disease according to the symptoms, signs and auxiliary examination, and give the correct treatment in time.