The child’s arm pain may be caused by the following reasons: first, radial head subluxation: because the child’s elbow is accidentally pulled, it can cause the phenomenon of radial head subluxation, parents should promptly take the child to the orthopedic department of the hospital to give a manual reset. Second, calcium deficiency: Because the child eats less, it is easy to cause calcium deficiency, so when this symptom appears, calcium treatment should be given in time. Third, soft tissue damage: because children are naughty, often play, bump, can cause soft tissue damage to the upper limbs, and cause pain in the arm, generally swelling, pain is obvious, local pressure pain, etc..