The radiating pain in the shoulder is caused by the following mechanisms: 1. It may be caused by the irritation of the nerve roots produced by cervical spondylosis. In the course of the onset of neurogenic cervical spondylosis, due to the compression and irritation of the nerve roots of the cervical spine, there will be radiating pain in the upper extremities, and the shoulder is the preferred location. 2. It may be due to entrapment pain caused by visceral lesions, if the patient develops related visceral lesions, such as acute If the patient has a related internal lesion, such as acute myocardial infarction, angina pectoris or cholecystitis, it may produce involvement pain in the shoulder, which may cause the patient to mistake it for radiating pain here. 3. It is caused by the stimulation of the peripheral nerves by compression, such as the relatively large nerves around the shoulder, which may cause radiating pain in the shoulder when stimulated by muscle spasm, cold or tumor compression.