1.After acute sprain, whether limping; 2.Gently coughing, whether the back pain is aggravated; 3.After resting in supine position, the pain still cannot be relieved; 4.In prone position, lightly touch the posterior lumbar region, the middle and both sides of the lumbar vertebrae with your own or a bystander’s hand, and check whether there is obvious pressure pain; 5.In supine position, then sit up, and observe whether your lower limb flexes the knee joint due to pain; 6.In supine position, the knee joint on the affected side is straightened, and the elevate the affected limb and observe whether its height is restricted due to pain. If one of them matches, it may be a lumbar disc herniation.