De quervain's tenosynovitis
Pain and swelling at the radial side of the wrist, where two tendons to the thumb run through a restricted tendon sheath. Occurs following repetitive movement of the wrist and thumb and can be quite incapacitating at least for normal work. Treatment is by ice and topical NSAID gel to the area, a splint to lay the hand and thumb into, and very often by steroid injection into the cuff of tendon sheath that is inflamed.
Physical treatment with transverse friction massage is reported to be effective.
A proportion of patients require surgery, an incision of the tight sheath.
From the history and examination. Finkelstein's test may be helpful.