Causes of right arm pain are divided into physiological and pathological, common pathological causes are trauma, orthopedic diseases and rheumatic diseases, etc., which can’t be simply summarized by three diseases. 1. Physiological: if the right arm is hit by external forces, stimulating the pain nerve, then it will cause pain; long time to keep the right arm posture, such as lifting the arm posture, will also cause right arm pain symptoms. All of the above are normal physiological phenomena, rest for a few moments can be restored, without additional special treatment. 2. Pathological: If the right arm has recently suffered trauma, resulting in soft tissue injury, it will produce pain due to local edema and compression of the pain sensory nerve; orthopedic diseases can also cause pain in the right arm, such as humerus fracture, bone tumors, cervical spondylosis and frozen shoulder, etc.; as well as rheumatic arthritis and other rheumatism diseases, which can also lead to this symptom. If the symptoms of right arm pain persist, it is recommended to go to the hospital in time for professional examination to find out the cause and professional treatment, so there is no need to worry too much.