The pain behind the right shoulder is divided into physiological and pathological, and the pathological causes are orthopedic diseases, soft tissue lesions, etc., which can not be simply summarized by four diseases. 1. Physiological: If you keep the posture of shoulder stress such as lifting the arm for a long time, the accumulation of lactic acid will cause the symptoms of pain behind the right shoulder, which is a normal physiological phenomenon, and there is no need for additional special treatment. 2. Pathological: If you suffer from cervical spondylosis, frozen shoulder and shoulder dislocation and other orthopedic diseases, the pain will be caused by the abnormal bones squeezing the nerves; there are also soft tissue lesions, such as deltoid posterior fasciculus injury, acute bursitis, spinal cord cavernous disease, and brachial plexus neuritis, which will lead to pain due to inflammation. If you suspect that the pain behind the right shoulder is pathologic, it is recommended that you seek medical attention promptly.