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The forearm muscles are attached to the bones of fingers with the help of tendons. In a healthy finger, the flexor tendons are covered by a tendon sheath with an associated pulley, allowing the tendon to flex and extend smoothly when the muscle contracts and relaxes. A trigger finger is caused when the tendon in the finger gets enlarged, or sheets around the tendon get thicker, and the tendon gets stuck in it. Due to this, the affected finger gets stuck in a bent position at the level of the A1 pulley and gets locked. A popping sound is produced when we try to unlock the finger and extend it. The condition may also be known as stenosing tenosynovitis. A similar condition can occur in the thumb, called the trigger thumb.