Arm pain should be registered with the orthopedic department for diagnosis and treatment, because the upper limb belongs to the motor system, including bones, nerves, muscles, ligaments, subcutaneous tissues, which all belong to the scope of orthopedics, so it should be registered with the orthopedic department for diagnosis and treatment. Common causes of arm pain include chronic strain, acute injury, joint inflammation, bony masses, and cervical spondylosis, all of which can lead to arm pain. All of these diseases and causes fall within the scope of orthopedics, so you should consult an orthopedic surgeon. In addition, there are certain diseases that belong to the cross-departmental treatment, such as rheumatoid arthritis, rheumatoid arthritis can go to the immuno-rheumatology department for treatment. Generally speaking, you should first register with the orthopedic department, and then go to the immuno-rheumatology department if it involves the immuno-rheumatology department after examination.