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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.
Symptoms and Diagnosis. de Quervain's tendonitis was initially common in new mothers who hyperextended their thumbs while holding the head of their babies. This syndrome is also fairly common in older individuals as well. The primary symptom of de Quervains tendonitis is pain at the base of the thumb near the wrist.