You go to straighten a finger and it won't move. Or it moves, but with a snap - like a rusty gate latch. For most people, that first episode is unsettling enough to send them straight to a search engine.
The condition is called trigger finger, or stenosing tenosynovitis. It's common, it tends to worsen if left alone, and in most cases it's very treatable - though how quickly depends on how far along it is by the time you get it looked at.
What causes trigger finger?
Each finger has a tendon running along its underside that connects forearm muscles to the fingertip. That tendon slides through a narrow tissue tunnel called the tendon sheath. In trigger finger, the sheath becomes inflamed and thickened, leaving less room for the tendon to pass through. The tendon catches as it moves, producing the clicking or locking sensation patients describe.
There's often no single identifiable cause. The condition is more common in women, in people over 40, in diabetics, and in anyone whose work involves sustained or repetitive gripping - gardeners, mechanics, musicians. Rheumatoid arthritis is also a known risk factor. The ring finger and thumb are affected most often, though any finger can be involved.
What does trigger finger feel like?
Early on, the main symptom is tenderness at the base of the affected finger, right where it meets the palm. A small, firm nodule sometimes forms there as the tendon tissue swells.
As the condition progresses, the finger begins to catch when you try to bend or straighten it. Eventually it may lock in a bent position entirely, requiring your other hand to physically straighten it - or releasing only with a painful snap. Many patients describe waking up with the finger locked and spending the first few minutes of the morning working it loose. Symptoms are almost always worse first thing in the morning and after periods of rest.
How is trigger finger diagnosed?
Diagnosis is clinical. No imaging or blood tests are required. A hand surgeon or orthopedic physician can usually confirm the diagnosis in a single office visit by examining the finger and asking about your symptoms. The characteristic finding is tenderness at the A1 pulley - the first section of the tendon sheath near the base of the finger - along with the catching or locking you've been experiencing.
Your doctor will also check for conditions that commonly travel with trigger finger, including rheumatoid arthritis and diabetes, since those affect treatment decisions.
What are the treatment options?
Treatment is stepped, starting conservatively.
A finger splint worn overnight holds the finger in a neutral position and reduces the inflammation that drives the problem. This works reasonably well for mild early cases, particularly in patients whose symptoms are connected to gripping-heavy work or hobbies. Resting the hand and avoiding the activity that aggravates it is worth trying first.
A corticosteroid injection into the tendon sheath is the most effective non-surgical option. About 60-70% of patients see significant improvement after one injection. A second shot is reasonable if the first only partially helped. Most hand surgeons recommend waiting at least six weeks between injections and keeping the total to three - repeated steroid shots can weaken the tendon over time. Patients with diabetes tend to respond less well to injections and often need surgery sooner.
When injections don't work, or when the finger is severely locked, surgery is a reliable next step. The procedure involves cutting the A1 pulley to give the tendon room to move freely. It's done under local anesthesia as an outpatient procedure and typically takes 15-20 minutes. Most patients recover full finger function within a few weeks.
Can trigger finger heal without surgery?
Sometimes. Mild cases do occasionally resolve on their own with rest and activity changes. Splinting alone works for a portion of early-stage patients.
The practical problem is that trigger finger tends to persist and worsen rather than improve with time. The longer a finger stays locked in a bent position, the more the joint itself can stiffen - which complicates recovery even after the tendon is fixed. If rest and a splint haven't moved things in the right direction after several weeks, a steroid injection is the better move than continuing to wait.
When should you see a hand surgeon?
See someone if the finger locks in a bent position and you can't straighten it without help, if catching is progressively worsening, if you've had symptoms for more than a few weeks without improvement, or if pain is getting in the way of normal daily activities.
Trigger finger is rarely an emergency. But it isn't the kind of thing that resolves on its own indefinitely, and the earlier the intervention the easier the treatment tends to be. A hand surgeon can give you a clear picture of where you stand and what the options are after a single visit.
