Trigger finger causes a finger to catch, snap, or lock when you bend or straighten it, often with a visible nodule at the base of the affected finger in the palm. In mild cases, the finger may look completely normal at rest but move with a jerky, uneven motion. In more advanced cases, the finger can get stuck in a bent position and physically cannot straighten without help from your other hand.
What You’ll See and Feel
The most recognizable visual sign is a small, firm bump at the base of the finger where it meets the palm. This nodule sits right over the spot where the tendon passes through a tight tunnel of tissue. You can often feel it by pressing into the palm just below the affected finger, and it may be tender to the touch. The bump can range from barely noticeable to clearly visible under the skin.
The hallmark movement is the “triggering” itself. When you try to bend or straighten the finger, it resists smoothly gliding and instead catches partway through. Then it suddenly snaps forward or backward, like pulling and releasing a trigger. This can be painless in some people and quite painful in others. The thumb and ring finger are affected most often, though any finger can develop it.
Symptoms are typically worse first thing in the morning. You may wake up with the finger stiff and locked in a bent position, and it gradually loosens as you use your hand throughout the day. This morning pattern is one of the most distinctive features of the condition.
How It Progresses Over Time
Trigger finger doesn’t usually start with a locked finger. It moves through a predictable progression that clinicians break into four stages:
- Stage 1: Pain and tenderness in the palm at the base of the finger. The finger still moves normally, so it may not look any different. You just feel soreness when gripping or pressing on that spot.
- Stage 2: The finger starts catching during movement. You’ll notice an uneven, jerky motion when bending or straightening, sometimes with an audible click or pop.
- Stage 3: The finger locks into a bent position but can still be manually straightened. You use your other hand to push it back into place, sometimes with a painful snap.
- Stage 4: The finger is locked in a fixed bent position and cannot be straightened at all, even with your other hand.
Not everyone progresses through all four stages. Some people stay at the catching phase for months or years without it worsening, while others move to a locked finger relatively quickly.
Why the Finger Gets Stuck
Each finger has tendons that run from the forearm through a series of small tunnels in the hand and fingers. These tunnels, called pulleys, hold the tendon close to the bone so it can efficiently bend the finger. In trigger finger, the tendon or the entrance to one of these tunnels thickens and swells. The tendon develops a nodule that’s too large to slide smoothly through the narrow opening.
Think of it like trying to pull a rope with a knot through a ring that’s just barely too small. The knot catches at the ring, builds up pressure, then pops through with a snap. That’s exactly what’s happening inside your hand when the finger triggers. If the swelling gets severe enough, the knot can no longer pass through at all, and the finger locks in place.
How It Differs From Dupuytren’s Contracture
The condition most commonly confused with trigger finger is Dupuytren’s contracture, because both can cause a finger to curl toward the palm. But they look and behave differently in important ways.
Dupuytren’s contracture involves thickened tissue just under the skin of the palm, not the tendons. You’ll see firm cords or bands running from the palm into the fingers, and the lumps form in the palm itself rather than at the base of a specific finger. The fingers gradually curl inward over months or years and eventually can’t straighten, but there’s no catching or snapping motion. It most commonly affects the ring and pinky fingers.
Trigger finger, by contrast, involves the tendon and its surrounding tunnel. The finger doesn’t slowly contract. Instead, it moves in fits and starts, catching and releasing. A quick way to tell the difference: if your finger snaps or pops during movement, that points toward trigger finger. If your finger is slowly and steadily curling toward your palm without any catching, that’s more consistent with Dupuytren’s.
Who Gets It
Trigger finger is more common in women and people over 40. It frequently affects people who do repetitive gripping motions, whether from work, hobbies, or sports. Diabetes is one of the strongest risk factors. People with diabetes are up to 10% more likely to develop the condition, and when they do, it tends to affect multiple fingers and respond less well to initial treatment.
Rheumatoid arthritis, thyroid disease, and other conditions that cause inflammation also increase the risk. Some people develop trigger finger after surgery on the hand, particularly carpal tunnel release, due to swelling during healing.
What Treatment Looks Like
Early-stage trigger finger often responds to rest, splinting, and avoiding the gripping motions that aggravate it. A splint keeps the finger in a straight position, usually worn at night, to prevent it from locking while you sleep.
If the catching persists, a steroid injection into the tendon sheath is the most common next step. These injections reduce the swelling that’s causing the tendon to catch. The overall success rate is around 66%, though a single injection resolves symptoms in only about a third of cases. A second injection improves those odds significantly, bringing the success rate closer to 63%. For people with diabetes or those who’ve had symptoms for a long time, injections tend to be less effective.
When injections don’t work or the finger is fixed in a locked position, a minor surgical procedure can widen the tunnel entrance so the tendon glides freely again. Recovery from the surgery typically takes a few weeks, with most people regaining full finger movement. The procedure is usually done under local anesthesia, and you go home the same day.