The causes of right arm pain may be frozen shoulder, rotator cuff injury, acromioclavicular impingement syndrome, shoulder osteoarthritis, cervical spondylosis and so on. 1. Frozen shoulder: Frozen shoulder is caused by aseptic inflammation around the right shoulder joint due to chronic strain injury and long-term exposure to cold, which will result in pain in the right arm and limitation of activities. 2. Rotator cuff injury: excessive use of the shoulder joint, such as tennis, badminton players, etc., will mostly occur in the right rotator cuff injury, the right arm will have symptoms of pain, and may also be accompanied by swelling, limited activities and other symptoms. 3. Acromioclavicular impingement syndrome: Acromioclavicular impingement syndrome causes swelling and inflammation of the rotator cuff tendon and subacromial bursa, which causes shoulder pain and other symptoms. 4. Shoulder arthritis: Osteoarthritis of the shoulder joint, rheumatoid arthritis and other diseases will cause pain and swelling of the shoulder joint. 5. Cervical spondylosis: Cervical spondylosis can cause pain in the neck and shoulder by compressing or stimulating the nerves, and there may be symptoms such as radiating soreness and numbness in the upper limbs. Right arm pain may also have other causes, such as cholecystitis, shoulder joint tumors, etc. It is recommended to go to the hospital in time to identify the cause of the disease and then targeted treatment.