Trigger finger, medically known as stenosing tenosynovitis or trigger digit syndrome, is a painful condition resulting from the inflammation and narrowing of the sheath surrounding the tendons in the finger or thumb. This narrowing restricts the tendon's smooth movement, leading to symptoms such as pain, stiffness, a catching or locking sensation, and a 'clicking' or 'popping' sound, especially when bending and straightening the digit. While any finger can be affected, the thumb and ring finger are most commonly involved. It is frequently observed in individuals over 45-50 years old and those with underlying health conditions like diabetes, rheumatoid arthritis, or thyroid dysfunction. Common treatment approaches include rest, splinting, and specific finger exercises.