De quervains. I have found that a soft neoprene splint works well for dequervain's tenosynovitis. A soft splint tends to inhibit the thumb and wrist from going toward the extremes of motion ( the position of thumb extension -hitchhiking- and simultaneous radial deviation of the wrist--moving your wrist and hand toward the thumb side and the opposite, turning the wrist away form the thumb side while reaching or.
Pain. The primary symptom from dequervain's is pain along the thumb side of the wrist. There can be swelling as well as a "creaking" sensation with thumb movements as well as simulated hammering motion of the hand/wrist.