Two shoulder pain consider physiological factors, or pathological factors, such as frozen shoulder, cervical spondylosis, rheumatoid arthritis, rotator cuff injury and other reasons. 1. Physiological factors: for example, long time working at desk or too long a posture can cause muscle strain, if the local feeling of cold will also appear soreness. 2. Frozen shoulder: mostly occurs in middle-aged and old people, mainly shoulder joint pain, active and passive activities are limited. 3. Cervical spondylosis: Osteomalacia or herniated intervertebral disc can radiate to shoulder pain. 4. Rheumatoid arthritis: symmetrical joint pain, swelling and morning stiffness can occur. 5. Rotator cuff injury: due to trauma or degeneration caused by ligament tears, resulting in shoulder pain, lifting weakness. There are many other causes of shoulder pain, it is recommended that you need to go to the hospital for further examination to clarify the cause of the disease for treatment.