The causes of inner shoulder pain include frozen shoulder, shoulder fasciitis, cervical spondylosis and so on. 1. Frozen shoulder: also known as frozen shoulder, mostly manifested as swelling and pain in the shoulder joint area, accompanied by muscle weakness and impaired movement, affecting daily life, and in the later stage of patients with serious condition, the activity of the shoulder joint on the affected side will be severely limited. 2. Shoulder fasciitis: aseptic inflammation of soft tissues such as fascia, muscles, tendons and ligaments, causing shoulder pain, stiffness, limited movement and weakness. 3. Cervical spondylosis: cervical spondylosis causes shoulder pain, the most common symptom is nerve root compression, the pain is usually not intense, and may be accompanied by numbness and weakness of the limbs and other symptoms. Inner shoulder pain may also have other causes, such as muscle spasm, etc. It is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.