Shoulder pain due to sleeping pressure may be caused by frozen shoulder, incorrect sleeping posture, cervical spondylosis and other reasons. 1. Frozen shoulder: a disease mainly characterized by limitation of both active and passive activities of the shoulder joint. Patients may experience pain in the shoulder, which can also be caused by sleeping on the shoulder. 2. Incorrect sleeping posture: It may be due to muscle pain caused by sleeping with one shoulder pressed all the time, or not sleeping on a pillow, etc., which may lead to shoulder pain. 3. Cervical spondylosis: It is mainly caused by osteophytes and long-term strain. Patients may have limited neck movement, pain, or the phenomenon of the whole shoulder and back pain, stiffness, and shoulder pain can occur when sleeping in poor posture. It is recommended that patients with shoulder pain due to sleeping pressure should go to the hospital in time, and follow the doctor’s instructions for treatment after clarifying the cause of the disease, so as to avoid delaying the condition.