Trigger finger/causes Trigger finger is usually caused by swelling of 1 of the tendons that run along your fingers and thumbs, although the exact reason why this occurs is not 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. Who's most at risk? The exact cause of trigger finger is not fully understood. However, you're more at risk of developing trigger finger if:
Other health conditionsYou may also be more likely to develop trigger finger if you have any of the following conditions:
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