Ganglions (Cysts) of the Wrist
Ganglions (cysts) commonly grow on the top of the wrist (dorsal ganglions), but they may also occur on the underside of the wrist between the thumb and the pulse point. A ganglion grows out of a joint on a stalk, and is filled with thick, slippery fluid. Usually, the more active you are the larger the cyst becomes; when you rest it may decrease in size. No one knows what triggers the formation of a ganglion, but they can be painful if they put pressure on the nearby nerves and tendons. Smaller ganglions that remain hidden under the skin (occult ganglions) may be quite painful. Treatment options include observation, immobilization, aspiration, and surgical excision.