After the recovery period of cerebrovascular disease, if rehabilitation exercises are not carried out in time, contracture, stiffness and deformity of the hemiplegic side of the limb will occur, even causing severe pain, causing great pain to the patient, the common causes of pain in the paralyzed limb are as follows: 1. Shoulder joint subluxation: After complete paralysis of the upper limb, the muscles around the shoulder joint will relax, and under the influence of gravity, the shoulder joint will often be pulled and subluxation will occur Under the influence of gravity, the shoulder joint is often strained and subluxated. Patients often feel pain or discomfort, especially when giving passive movement to the affected limb. Why is the shoulder joint prone to subluxation? This is due to the characteristics of the shoulder joint itself. We know that the range of motion of each joint in the body varies greatly. The shoulder joint has the largest range of motion. It can move in almost all directions, allowing us to perform a variety of daily activities with flexibility. This function of the shoulder joint is mainly related to its structure. Because the shoulder fossa is shallow and the joint head is round and large, it is certainly easy to move. However, when the limb is paralyzed, the muscle ligaments around the shoulder joint relax and the function of fixing the joint is weakened. Combined with the effect of gravity, the shoulder joint leaves the joint fossa and slips below, resulting in clinical changes in the shape of the shoulder joint and pain. 2.Shoulder-hand syndrome: This syndrome often occurs 1-3 months after cerebrovascular disease, and is a common cause of shoulder pain and hand pain after cerebrovascular disease. If left untreated, the consequences are serious and often cause disability. This disease mainly manifests as shoulder pain on the affected side, hand pain, limited upper limb abduction, rotation outward and lifting upward, forced passive movement then severe pain, swelling of the back of the hand and fingers, disappearance of skin wrinkles on the back of the hand, shiny feeling, slight concavity when pressed, gradual redness of the skin, increased skin temperature and painful flexion of the finger and wrist joints, etc. 3. Shoulder periarthritis: It often occurs several months after hemiplegia, and the clinical manifestation of pain during upper arm abduction and lifting is gradually aggravated later. The patient develops persistent severe pain in the upper arm and hand, which often makes it difficult for the patient to sleep and cry hopelessly, and begs the doctor or others not to move his shoulder and arm. In addition, severe flexion and inversion of the toes, atrophy of the elbow and knee flexors, and shortening of the Achilles tendon also often cause pain in the affected limb when touching the ground or moving around.