Trigger Finger – Things to Know Posted on March 31, 2015June 21, 2023 Trigger finger is a painful condition that causes the fingers or thumb to catch or lock when bent. In the thumb its called trigger thumb. The problem Painful condition characterised by: Inability to bend fingers freely Caused by inflammation and thickening of the annular pulleys of the flexor tendons Disorder characterised by inability to extend the flexed fingers Painful and very common Features Women above 45 are commonly affected Common in patients with rhuematoid athritis The ring and middle fingers are most commonly affected Treatment Steroid injection