Damaged arm A damaged arm is a common injuries that sometimes happens once the arm hits an object or is forcefully pulled. Ulnar Collateral Ligament (UCL) Sprain: Typically seen in athletes, specifically in throwers and baseball pitchers, this ligament damage may cause sharp pain on The within of your elbow. https://www.theorthopaedicandpainpractice.com/the-latest-advances-in-elbow-nerve-pain-treatment/