Swelling of the leg after hip fracture may be a normal physiological phenomenon after surgery, or it may be caused by deep vein thrombosis and low albumin. 1. Normal physiological phenomenon: swelling of the leg after fracture is a very common phenomenon, which is caused by poor blood circulation and lymphatic circulation in the lower limbs, and with the healing of the fracture, the symptoms will disappear slowly. 2. Deep vein thrombosis: Edema due to poor venous return is caused by venous thrombosis. It is usually caused by obstruction of venous return. 3. Low albumin: The body’s albumin level is lower than normal, which will cause the plasma’s colloid osmotic pressure and crystal osmolality to decrease, thus causing tissue edema, and the foot is the lowermost part of the limbs, which will produce swelling of the feet due to the effect of gravity. If the symptoms of postoperative foot swelling after hip fracture persist without relief, timely medical treatment is needed.