2018-08-21 - Trigger finger is a condition where it is difficult to extend the finger and the finger then unlocks with a snap. It is caused by localised thickening of the tendon that glides through a narrow tunnel in the hand.
Dr. Nguyen explains the basics of Trigger Finger, a condition that causes pain, stiffness, and a locking sensation when you bend and straighten your finger.
I Think I Have a Trigger Thumb – What Can I Do About It? -