Patrick J. McDaid, M.D.

De Quervain’s tenosynovitis is a painful condition that affects the tendons in the wrist. It occurs when the two tendons around the base of the thumb become swollen. The swelling causes the sheaths (casings) covering the tendons to become inflamed. This puts pressure on nearby nerves, causing pain and numbness. Symptoms: The main symptom of de Quervain’s tenosynovitis is pain or tenderness at the base of the thumb and also pain going up a forearm. The pain may develop slowly