Arm pain can’t be lifted up, the following common causes: 1, calcific tendonitis of the shoulder, this pain is a sudden pain, can cause the arm can’t be lifted up, fatigue, arm’s tiny activities can also cause shoulder pain. 2, acromioclavicular impingement syndrome, is because of repeated arm lifting and acromioclavicular joint below the osteophyte of the activity caused by the obstacle. When the condition worsens, it can cause tearing of the subacromial bursa or rotator cuff, resulting in arm pain and inability to lift the arm.3. Rotator cuff tear is the most common cause of pain in middle-aged and old people because of the weakness of lifting the arm after rotator cuff tearing or the combination of subacromial bursitis, which results in pain and inability to lift the arm.