Falling to the arm bone will be fine will hurt consider is due to muscle injury, tendon tears, soft tissue ligament injury and other reasons. 1. Muscle injury: when the patient fell to the arm, the local muscle tissue may be damaged and torn, stimulating the local area of congestion or swelling, which may appear to fall to the arm bone will be fine will hurt. 2. Tendon tear: when the fall to the arm bone is fine, but the affected tendon tissue may have a certain degree of tearing, there may be a fall to the arm bone will be fine and painful symptoms. 3. Soft tissue ligament injury: when falling to the arm, may make the local soft tissue ligament injury, resulting in increased tension in the soft tissue, may appear to fall to the arm bone will be fine and painful phenomenon. When the pain occurs, it is recommended to go to the hospital in time for examination and diagnosis, to clarify the cause of the disease, under the guidance of professional doctors for targeted treatment.