When a sprain occurs in the arm, the recovery time is directly related to the degree and location of the injury as well as the tissue structure. If there is only a soft tissue contusion in the arm, there will be no ligament or joint capsule laceration or even rupture, and the arm will recover slowly after 3-4 weeks of recuperation, and there will be no significant dysfunction and other after-effects. If the sprain of the arm is followed by laceration of the joint capsule and ligaments, and in severe cases, rupture of the joint capsule and ligaments will occur, which will require braking and fixation for 4-6 weeks in mild cases, or surgery in severe cases, which will require at least 6 weeks of assisted external fixation after surgical repair. If a sprain of the arm does not show significant recovery in 3-4 weeks, other serious problems are sure to occur. It is recommended that patients with arm sprains go to the hospital for a detailed examination and treatment under the guidance of a professional doctor after a clear diagnosis, otherwise it is easy to delay the condition.