Resting the arm by not throwing is the most important step of treatment, especially for children.
Icing the joint and taking anti-inflammatory medications may be needed to relieve pain and swelling.
Proper form, not throwing too much, and a gradual return to throwing are key to keeping problems from coming back. Your doctor and your physical therapist will work with you on a program to slowly get you throwing again.
If non-surgical treatment doesn't work, you may need surgery for throwing injuries.