Trigger finger is a colloquial term for stenosing tenosynovitis, also known as flexor tendonitis. It happens when the fingers become stiff and lock, or stays stuck when you trying to bend them. Straightening these fingers can be done with a quick snap or pull, which is similar to releasing the trigger of a gun, hence the term “trigger finger.”
The cause of trigger finger is either inflammation or scarring of the tendons, which prevents the finger from sliding normally within the tendon sheath. It can arise following an injury, or extensive use of the hands and fingers.
However, according to the University of Michigan Medicine, trigger finger is quite common among 40 to 60-year-old people who suffer from diabetes and rheumatoid arthritis. It is more prevalent in women than in men.
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