And “pop” goes the trigger thumb. One of the most common causes of pain and dysfunction in the hand is trigger thumb.
With trigger thumb, patients present with a painful thumb that sticks or catches, often audibly, upon flexion or extension. Or, the patient’s thumb may be stuck or locked in the flexed position. Trigger thumb is thus named because once the thumb unlocks (often by passive manipulation), it snaps back much like discharging a trigger on a gun.