Arm bone pain, the following reasons are common: first, arm fracture, such as ulna, radius fracture, the patient will have obvious fracture displacement, pain symptoms, at the same time, there will be swelling and activity limitation, mainly rotational activity limitation, X-ray film can confirm the existence of fracture. Second, fatigue osteochondritis dissecans, the forearm bones, muscle attachments are subjected to prolonged tension, will cause periosteal tissue relaxation, periosteal bruising, edema, vasodilatation, and cellular exudation, as well as subperiosteal hemorrhage. Over time, subperiosteal hemorrhage will occur mechanization, and then the formation of new bone, the weakened bone tissue has a supportive and protective effect, but also at the same time fatigue osteochondritis, the patient will be manifested in the arm bone pain symptoms, timely treatment can be avoided fatigue fracture.