There are many causes of right arm pain. Common causes mainly include muscle strain, cervical spondylosis, right-sided frozen shoulder, trauma, right-sided lung disease and so on. 1. Muscle strain: Long-term work that requires repetitive arm movements, such as carpentry, chef, etc., or long-term arm sports, such as playing tennis, etc., leads to excessive arm strain, muscle strain, triggering arm pain. 2. Cervical spondylosis: refers to cervical disc degeneration and its secondary changes, irritation or compression of adjacent spinal cord, nerves, blood vessels and other tissues and a series of symptoms and signs of the syndrome. It is mostly related to prolonged head-down and desk work, etc. Clinical manifestation is pain in the neck and shoulder and radiating to the arm, which in turn leads to pain in the right arm. 3. Right-sided frozen shoulder: it refers to the chronic inflammatory disease that occurs when the shoulder joint and its surrounding ligaments, tendons and bursa are damaged due to various reasons. Early manifestation of shoulder joint pain, with the progress of the disease, the scope of the patient’s pain expanded, will involve the right arm. 4. Trauma: If the right arm is hit by external force and other traumatic injuries, local soft tissue damage or fracture, etc., it will also induce pain in the right arm. 5. Right lung disease: for example, infection or tumor in the right upper lung, the stimulation of inflammation and infection may appear radioactive pain in the right arm, in addition to tumor compression of local nerves may also appear local pain. Right arm pain should be clear whether there are reasons and triggers, if the pain can not be relieved for a long time, you need to seek medical treatment.