A trigger finger is caused by swelling within the sheath that surrounds the connective tissue that attaches muscles to the finger bones (finger tendon). The affected finger becomes stiff and may make a clicking sound when moved. It may catch in a bent position and straighten with a snap. Occasionally, the finger remains locked in the bent position. The finger may be painful, and there may be a bump or tenderness in the palm at the base of the finger, the spot where the tendon most likely is catching.
A trigger finger may be caused by overuse, but it can also be related to other medical conditions such as rheumatoid arthritis or diabetes. Trigger finger is common in people whose work or hobby requires repetitive gripping actions — such as musicians, gardeners and construction workers. But anyone can get one.
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