1, after acute sprain, whether limping. Such as walking with one hand on the waist or the affected side, the lower limbs are afraid of weight-bearing, and a hopping gait, or a posture that prefers the body to lean forward, while the hip is convex to one side. 2.Gently cough once or several times, whether the back pain is aggravated. 3.After resting in the supine position, the pain still cannot be relieved; try to see if the pain symptoms can be relieved when lying on the left side, bending the hips and knees. 4.In the supine position, gently touch the posterior lumbar region, the middle and both sides of the lumbar vertebrae with your own or a bystander’s hand to check whether there is obvious compression. 5.Supine position, then sit up and observe whether the patient’s lower limbs can flex the knee joint due to pain. 6.Supine position with the affected knee joint straightened and the affected limb elevated, and observe whether its height is restricted due to pain. Several self-examination methods introduced above, generally if a few items meet should be considered as having a possible lumbar disc herniation.