What Is Trigger Finger?

You bend a finger to grip a handle or type a few words, and instead of gliding smoothly it catches — then straightens with a small, unmistakable snap. That catching is the hallmark of trigger finger, and the short video above, at just under two and a half minutes, walks through why it happens in plain language.

What is going on inside the finger

The video gives the condition its formal name as well: stenosing tenosynovitis. Each finger is moved by a tendon that runs through a snug sheath. As the video explains, trigger finger occurs when inflammation narrows the space within that sheath, so the tendon no longer slides freely. The finger can get stuck in a bent position, then straighten with a snap — like a trigger being pulled and released. In more severe cases, the video notes, the finger may become locked in that bent position. It is a mechanical problem of a tendon in a too-tight tunnel, not a bone or joint problem, and that distinction shapes everything that follows. Hand tendons do a lot of quiet work, as this site's "Flexor Tendon Repair Procedure" video shows from the surgical side.

Who tends to notice it first

According to the video, people whose work or hobbies require repetitive gripping actions are at higher risk, and the condition is also more common in women and in anyone with diabetes. You do not need to match any of those descriptions to develop it, though. The practical signal is simpler: a finger that repeatedly catches, clicks, or needs help from your other hand to straighten deserves an examination, especially if it is getting stiffer rather than settling.

What to expect at an appointment

Expect the clinician to start with the story and the hand itself. You will likely be asked when the catching began, which finger is involved, and whether it locks. The examination is hands-on and straightforward — watching the finger bend and straighten, and feeling for tenderness along the tendon on the palm side. Because the mechanism is visible and feelable in clinic, the assessment the video describes is centred on that examination rather than on elaborate testing. While you are there, it helps to mention related hand problems too; a lump at the wrist, for example, is a different condition covered in our article on what a ganglion cyst is, and tingling in the fingers points toward the separate issue explained in our guide to carpal tunnel syndrome.

What happens after it is named

Here the video is deliberately measured: treatment of trigger finger varies depending on the severity. That is worth hearing as reassurance rather than vagueness. A mildly catching finger and a finger locked bent are not the same problem, so they are not managed the same way, and the right next step is the one matched to your examination. What you can expect is a plan that follows the severity — and a review if the catching worsens, the finger locks more often, or it will not straighten at all. Naming it is usually the turning point: once you know the snap has a mechanical cause, you can stop forcing the finger and get it looked at properly.

Frequently Asked Questions

What is another name for trigger finger?

The anchor video gives its formal name as stenosing tenosynovitis — inflammation narrowing the space within the sheath that surrounds the tendon in the affected finger.

Why does the finger snap straight?

Because the tendon catches as it tries to slide through its narrowed sheath, then releases suddenly. The video compares it to a trigger being pulled and released.

Can trigger finger lock a finger in place?

Yes. The video notes that if trigger finger is severe, the finger may become locked in a bent position — one of the signs that an in-person assessment should not wait.

Does trigger finger always need a procedure?

No single answer applies. The video states that treatment varies depending on the severity, so the plan follows your examination rather than a fixed rule.

MedicalVideos.com has published trusted medical videos since 2007. The site was founded by Dr. Mohamed Ibrahim, MD, PhD — physician-scientist.

Educational only — this article is general information about trigger finger, not medical advice and not a diagnosis. A finger that locks, will not straighten, or keeps catching should be examined in person.