Right upper arm lateral muscle pain, consider with frozen shoulder, cervical spondylosis, myofasciitis and other diseases, need to go to the hospital for further examination to clarify the cause of the disease, and then timely consultation. 1. Frozen shoulder: It is usually due to the stimulation of aseptic inflammation of the shoulder joint, which causes the phenomenon of muscle pain on the lateral side of the right upper arm. Frozen shoulder may have symptoms such as pain and limitation of shoulder joint movement. 2. Cervical spondylosis: usually due to cervical spondylosis compression of nerve root radiating pain, thus causing the phenomenon of right upper arm lateral muscle pain, and may appear four upper extremity numbness, muscle strength and other symptoms. 3. Myofasciitis: it may be due to the repeated lifting activities of the upper limb, resulting in repeated friction between the acromion and the muscle, which will stimulate the synovial capsule between the two, thus causing the phenomenon of the right upper arm lateral muscle pain, myofasciitis usually occurs with pain, muscle spasm and other symptoms. If the phenomenon of right upper arm lateral muscle pain, you need to consult a doctor in time, and should pay attention to climate change, to prevent catching cold, weight control, appropriate exercise.