If muscle stiffness in the back of the shoulder occurs, it is likely to be caused by cervical spondylosis. This condition is mainly caused by cervical spine lesions due to poor posture and habits such as prolonged head bowing, which can compress nerves and cause muscle stiffness in the neck, shoulders and back, as well as pain or numbness and other uncomfortable symptoms. In this case, local physiotherapy and massage are needed, as well as acupuncture and traction for the cervical spine, and CT examination of the neck can be done to clarify the symptoms, and then the corresponding treatment plan can be chosen according to the specific severity. For patients with severe symptoms, minimally invasive surgery should be considered to improve the symptoms and attention should be paid to good posture habits, and cervical spine health exercises can be done frequently to improve.