Trigger finger
Trigger finger is usually caused by swelling of one of the tendons that run along your fingersand thumbs, although the exact reason why this occurs isn't fully understood.
The swelling makes it difficult for the affected tendon to slide through its membrane (tendon sheath), causing the pain and stiffness associated with trigger finger.
The swelling can cause a section of the tendon to become bunched into a small lump (nodule) at the base of the affected finger or thumb.
If a nodule forms, the tendon can get trapped in the tendon sheath, causing the affected finger or thumb to become temporarily stuck in a bent position. The affected tendon may then suddenly break free, releasing your finger like the release of a trigger.
The exact cause of trigger finger isn't fully understood. However, you're more at risk of developing trigger finger if:
You may also be more likely to develop trigger finger if you have any of the following conditions:
Trigger finger is a condition that affects one or more of the hand's tendons, making it difficult to bend the affected finger or thumb.
Trigger finger is caused by swelling that occurs in one of the tendons in your fingers or thumb. However, it's not known exactly why the swelling occurs.
Read about the possible treatment options for trigger finger including anti-inflammatory medication, splinting, corticosteroid injections and, in severe cases, surgery.