The common causes of swollen feet and calves are physiologic swelling, venous thrombosis, heart disease, lymphatic system disease and so on. 1. Physiological swelling: Sitting or standing for a long time can cause swelling of feet and calves, which can be relieved after rest. 2. Venous thrombosis: Venous thrombosis may cause swelling of the feet and calves, which cannot be relieved after resting, and then venous ultrasound of the lower limbs is needed to confirm the diagnosis. 3. Heart disease: Cardiac insufficiency can cause venous return obstruction, resulting in swelling of the feet and lower legs. 4. Lymphatic system diseases: Lymphangitis and other lymphatic system diseases can also cause swelling of the feet and calves, which is characterized by orange peel-like skin, thickening and softness, and depression when pressed, which will be restored when you let go. Swollen feet and calves can also be caused by other reasons, once the swelling can not be relieved, should go to the hospital in time to identify the cause and targeted treatment.