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Why does trigger finger happen?

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Trigger finger happens when tendons in the finger or thumb become inflamed. A tendon usually glides easily through the tissue that covers it (called a sheath) because of a lubricating membrane surrounding the joint. Prolonged irritation of the tendon sheath can produce scarring and thickening that get in the way of tendon's motion. When this happens, bending the finger or thumb can pull the inflamed tendon through a narrowed tendon sheath, making it snap or pop.

From: Trigger Finger and Trigger Thumb WebMD Medical Reference

SOURCES:

American Academy of Orthopaedic Surgeons.

Mayo Clinic: “Trigger finger: Diagnosis & treatment,” “Trigger finger: Symptoms & causes.”

OrthoInfo: “Trigger Finger.”

Reviewed by David Zelman on March 21, 2018

SOURCES:

American Academy of Orthopaedic Surgeons.

Mayo Clinic: “Trigger finger: Diagnosis & treatment,” “Trigger finger: Symptoms & causes.”

OrthoInfo: “Trigger Finger.”

Reviewed by David Zelman on March 21, 2018

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What causes trigger finger?

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