Patients with right arm joint pain can be caused by several reasons: First, tennis elbow or golf elbow: both are also called humeral epicondylitis or medial humeral condylitis and can often lead to pain in the medial and lateral side of the arm joint, with a significant increase in pain when moving the forearm. This is the time to check early, according to the patient’s occupation as well as the characteristics of the pain, to early diagnosis and treatment. Second, diseases of the joint itself: for example, degenerative arthritis or congenital elbow valgus can also lead to pain in the arm joint, which should be diagnosed by taking X-rays of the elbow joint. Third, rheumatic diseases: elbow arthritis due to rheumatism or rheumatoid arthritis can also lead to pain in the elbow joint. Fourth, tumor: If there is a tumor growing in the bone and soft tissue of the arm joint, it can also cause pain, which should be examined by MRI and, if necessary, pathological examination to further confirm the diagnosis and treatment.