The common causes of sudden severe pain in the right shoulder are as follows: First, dislocation of the right shoulder joint, trauma can cause acute dislocation of the right shoulder joint, the patient will experience sudden severe pain symptoms, accompanied by limited shoulder joint activities and shoulder joint swelling, the patient’s glenoid part of the joint is empty, when pressed, the humeral head can be clearly felt protruding in the front of the lower part of the shoulder joint, the X-ray examination can be confirmed that the shoulder joint is dislocated, after timely repositioning can be relieved of pain symptoms. X-ray examination can confirm the dislocation of the shoulder joint, and the pain symptoms can be relieved after timely reset. Secondly, calcific tendonitis, rotator cuff tendon foci of calcification can cause severe and sudden pain in the shoulder, and the patient will have limited movement of the shoulder joint, and the pain will seriously affect the patient’s work and rest, and the MRI of the shoulder joint can find the foci of calcification, and it is necessary to carry out arthroscopic surgery to remove the foci of calcification, and then it can alleviate the symptoms of shoulder joint pain.