The common causes of right shoulder joint pain are right shoulder joint synovitis and inflammation around the right shoulder joint, as follows: First, right shoulder joint synovitis: after trauma, cold or overexertion of the right shoulder joint, it is easy to cause shoulder joint synovitis, and the patient will have painful symptoms in the right shoulder joint, accompanied by joint effusion and limited joint movement. Secondly, inflammation around the right shoulder joint: the patient will also have painful symptoms in the right shoulder crease and limited movement of the right shoulder joint, mostly in middle-aged and elderly patients. Therefore, patients with pain behind the right shoulder should consult a doctor in a timely manner and be treated according to the different causes after diagnosis.