The inability to lift the arm after a fall is often related to fracture, joint dislocation or subluxation and joint adhesion. 1. Fracture: the inability to lift the arm after a fall is mostly caused by the fracture of the surgical neck of the humerus, the fracture of the glenoid, the fracture of the clavicle, the fracture of the acromion, etc., which makes the patient’s arm unable to be raised normally due to the severe pain after the fracture. 2. Dislocation or subluxation of joints: If the joints are dislocated or subluxed, the patient’s arm can not be lifted up, the most common ones are subluxation of the shoulder joint and subluxation of the elbow joint. 3. Joint adhesion: if the arm can not be lifted for a period of time after the fracture, it may be due to the local bleeding after the fracture, the bruise blood accumulates around the shoulder joint, which leads to the local adhesion and contracture of the joint soft tissues, so that the joint can not be lifted up. When you can not lift your arm after a fall, you should go to the orthopedic department of the hospital in a timely manner to confirm the diagnosis and treatment of the cause through examination.