Lying down and lifting the leg with back pain consider that the patient may have sciatica and lumbar disc herniation. Lying down and lifting the leg is clinically known as the straight leg raising test, which is a commonly used examination method, and the positive rate in patients with sciatica and lumbar disc herniation can reach more than 90%, reflecting the severity of the condition of sciatica and lumbar disc herniation, as well as the degree of nerve root compression. During the examination, the patient takes the supine position, the examiner holds the patient’s ankle with one hand, and places the other hand above the knee joint, so that the knee joint stays in the straight position and is elevated to a certain angle, or the patient can elevate the lower limbs by himself, to see if there is any pain in the lower back and legs. Positive indicators of the test to the lower extremities of the radiating pain, numbness and other discomforts, but also some patients can have lumbar pain, is due to the herniated lumbar intervertebral disc compression of the nerves, so the patient lying down to lift the leg back pain to consider that the patient may have a lumbar intervertebral disc herniation. Only by lying down and lifting the legs of the back pain symptoms can not be clearly diagnosed, need to improve the lumbar CT, MRI and other tests, and then symptomatic treatment.