Trigger Finger Trigger Finger Why do I need to register or sign in for WebMD to save? 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. Trigger finger happens when tendons in the finger or thumb become inflamed. Tendons are tough bands of tissue that connect muscles and bones. Together, the tendons and muscles in the hands .. 2013. 5. 16. 이전 1 2 3 4 5 다음