If the patient has thigh swelling pain, the causes include thigh tissue strain, lumbar disc herniation, hip joint area disease, lower limb venous thrombosis, etc., as follows: a. Thigh tissue strain: thigh muscle, fascia, ligament strain or cold, and injury, the patient is prone to thigh area swelling pain. Second, lumbar disc herniation: after compression of the nerve root, the patient will also appear thigh swelling pain. Hip joint diseases: such as hip synovitis, femoral head necrosis, hip degeneration, osteoarthritis, will also cause thigh distension and pain, especially after the weight-bearing activities, the symptoms are more obvious. Fourth, lower limb vein thrombosis: also easy to cause thigh swelling pain. So after the patient appears thigh swelling pain, must see a doctor to see what causes, for the cause of treatment, to promote the thigh swelling pain reduction, recovery. In the event of thigh swelling and pain, be sure to pay attention to leg warmth and avoid excessive force activities on the legs to avoid aggravating the situation.