Trigger thumb

It's also known as trigger finger and it causes a person's finger or thumb to get caught in a locked position. According to the Mayo Clinic, it can then stay stuck or straighten with a painful "snap."

The cause? It depends. Trigger Thumb is the result of a narrowing of the sheath around the tendon in the problem figure, but that can be caused by a lot of things, including any activity that requires people to grip things frequently. Trigger Thumb is also more frequent in women.