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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.
Tendinitis of the wrist is caused by repetitive motions. It's common in sports like tennis and field hockey, which repeatedly engage the wrist. The base of the thumb is the most commonly affected area, resulting in a condition called De Quervain's tendinitis and producing pain and swelling.