Shoulder pain can be caused by the following reasons: First, frozen shoulder, frozen shoulder can have shoulder pressure when sleeping, appearing shoulder pain aggravated. At this time, we should check the body and examine the X-ray and MRI of the shoulder joint for early diagnosis and treatment; second, myofasciitis, myofasciitis can start with pain on the inner side of the scapula, which can radiate to the ipsilateral shoulder and upper limb, and the shoulder pain is very obvious in the morning when the affected side is under pressure at bedtime. When cervical spondylosis compresses the nerve roots, it can be seen when the nerve roots are compressed in the neck after sleeping, which can lead to radioactive pain in the shoulder, and it is necessary to check the X-ray and MRI of the cervical spine for early diagnosis.