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De Quervain's tenosynovitis is inflammation of tendons on the side of the wrist at the base of the thumb. These tendons include the extensor pollicis brevis and the abductor pollicis longus tendons, which extend the joints of the thumb. De Quervain's tenosynovitis can be brought on by simple strain injury to the extensor pollicis longus and abductor pollicis tendons (tendinitis). Often this form of tendinitis is a result of repetitive motion injury.
De Quervain's tendinitis is usually most frequent in middle-aged women. Common signs and symptoms of De Quervain's tendonitis include pain along the thumb side of the wrist, swelling over the thumb side of the wrist, and sometimes numbness (caused by irritation of a nearby nerve) over the back of the thumb and index finger, and occasionally a âcatchingâ sensation when moving the thumb.