De Quervain's tenosynovitis is a condition that causes pain on the inside of the wrist and forearm just above the thumb. It is a common problem affecting the wrist and is usually easy to diagnose.

Proper treatment can help. This includes avoiding activities that cause symptoms. You may be issued a special wrist and thumb splint to prevent movement. Anti-inflammatory medications may also help control the swelling.

If these simple measures fail to control your symptoms, your doctor may suggest an injection of cortisone into the irritated tunnel. 

Your doctor may have you work with a physical or occupational therapist. The main focus of therapy is to reduce or eliminate the cause of irritation of the thumb tendons. Your therapist may check your workstation and the way you do your work tasks. Suggestions may be given about the use of healthy body alignment and wrist positions, helpful exercises, and tips on how to prevent future problems.