Common causes of back, shoulder blade and arm pain include:1, pain caused by cervical spondylosis, cervical spine disc herniation compresses the cervical spinal cord and peripheral nerves and blood vessels, which can cause radiating medial edge of scapula pain and upper extremity pain and muscle numbness.2, pain caused by cervical dorsal fasciitis, which generally refers to the aseptic inflammation that occurs in soft tissues of the cervical back, such as the fascia, muscles, tendons, and ligaments, and usually causes shoulder and back pain, long-term chronic strain injury, such as long-term ambulatory work, maintaining upper body posture for a long time, making muscles overly tense, stiff and poor blood circulation. Pain caused by long-term chronic strain, such as long-term work, long-term maintenance of the upper body posture immobile, so that the muscle excessive tension, stiffness and poor blood circulation caused.3, osteoarthritis of the shoulder joint.4, back muscle strain caused by excessive exercise, pain caused by strain, or strenuous exercise caused by anaerobic respiration of the muscles produced by the buildup of lactic acid, caused by the back of the shoulder and arm soreness. If pain occurs in the whole area of the back of the shoulder and radiates to the arm, the patient should go to the hospital in time to exclude the cause of cervical spondylosis.