De Quervain's disease

De Quervain syndrome occurs when two tendons that control movement of the thumb become constricted by their tendon sheath in the wrist. This results in pain and tenderness on the thumb side of the wrist. Radial abduction of the thumb is painful. On some occasions, there is uneven movement or triggering of the thumb with radial abduction. Symptoms can come on gradually or be noted suddenly.

The diagnosis is generally based on symptoms and physical examination. Diagnosis is supported if pain increases when the wrist is bent inwards while a person is grabbing their thumb within a fist.

Treatment for de Quervain tenosynovitis focuses on reducing inflammation, restoring movement in the thumb, and maintaining the range of motion of the wrist, thumb, and fingers. Symptomatic alleviation (palliative treatment) is provided mainly by splinting the thumb and wrist. Pain medications such as NSAIDs can also be considered. Steroid injections are commonly used, but are not proved to alter the natural history of the condition. Surgery to release the first dorsal component is an option. It may be most common in middle age.

Source: Wikipedia