The patient’s thigh pain when lifting up, the possible causes include sciatic nerve pulling, pear-shaped muscle syndrome, etc., as follows: 1, sciatic nerve pulling: because the thigh is lifted up, in the clinic refers to the straight leg raising, straight leg raising caused by the pain in the lower limbs, usually sciatica, can be seen in lumbar intervertebral disc herniation, intervertebral disc tissues compressed to the spinal nerve root, in the thigh lifting up the sciatic nerve tension increases, will cause nerve compression parts more serious, so there will be radiating pain. 2, pear-shaped muscle syndrome: because the sciatic nerve is compressed in the area of the pear-shaped muscle, when the thigh is lifted, there will be radioactive pain. Increase in the tension of the sciatic nerve when the thigh is lifted will cause more serious nerve compression, so there will be radiating pain in the lower limbs. 2, pyriformis syndrome: due to the sciatic nerve in the pyriformis muscle area is compressed, when the thigh is lifted, it will also cause radiating pain in the lower limbs. In these cases, we must actively treat the primary disease, if it is lumbar disc herniation, we must carry out the removal of the herniated disc, if it is the pyriformis syndrome, we must carry out the hot compress of the pyriformis muscle area, and sometimes we need to carry out the pyriformis muscle release surgery.