Trigger finger is a painful condition that causes your fingers or thumb to catch or lock when you bend them. It can affect any finger, or more than one. When it affects your thumb, it’s called trigger thumb.
Symptoms you might notice:
A painful clicking or snapping when you bend or straighten your finger. It’s worse when your finger’s been still, and it gets better as you move it.
Stiffness in your finger, especially in the morning
Soreness or a bump at the base of the finger or thumb. Your doctor will call this a nodule.
A popping or clicking as you move your finger
A locked finger that you can’t straighten
Read more about the condition here.