Trigger Finger: Why Your Finger Catches, Clicks and Locks

You wake up and your ring finger is bent into your palm. You straighten it with your other hand and it releases with a click you can feel more than hear. By mid-morning it moves almost normally. The next day it happens again.

Or it is less dramatic than that. There is a tender lump at the base of the finger, on the palm side, and a catch partway through closing your hand. Gripping a steering wheel, a kettle, or a pair of pliers makes it worse.

That pattern has a name, and the mechanism behind it is mechanical rather than mysterious. It also has a treatment path where physiotherapy owns one section and a physician owns the rest. Knowing which section you are in saves months.

What the catching actually is

The tendons that bend your fingers run from your forearm, through the wrist, and along the palm side of each finger. They need to stay close to the bone as the finger curls, otherwise they would bowstring away from it. A series of ring-shaped bands called pulleys holds them down.

The first of those, the A1 pulley, sits at the base of the finger where it meets the palm. Trigger finger happens there. According to StatPearls, maintained on the NCBI Bookshelf and updated in 2024 by Jeanmonod, Tiwari and Waseem, the flexor tendon becomes obstructed within its sheath at the A1 pulley, with narrowing of the sheath and thickening at the tendon-sheath interface.

Picture a rope running through a ring. Thicken the rope, narrow the ring, or both, and the rope still passes through when you pull hard. Coming back the other way it snags, then pops free. The pop is the click you feel.

That explains the pattern people describe:

• Worse in the morning, because the tissue swells overnight while the hand is still.
• A tender spot in the palm, not at the knuckle where the pain seems to be.
• A catch that releases suddenly, rather than a joint that grinds through its range.
• Pain referred forward to the middle joint of the finger, which sends many people looking at the wrong place.

The formal name is stenosing tenosynovitis. Stenosing means narrowing, and tenosynovitis refers to the tendon and its sheath. The thumb and the ring finger are the most commonly affected digits in adults, per the same StatPearls chapter.

Who gets it, and why diabetes keeps coming up

A 2025 clinical review in Cureus by Villarreal Acha and colleagues reports that trigger finger affects approximately 2% to 3% of the population, predominantly women, with a female-to-male ratio of around 3:1, and that it commonly occurs during the fifth or sixth decade of life. The same review documents a lifetime risk of 2.6%.

So the typical picture is a woman in her fifties. That said, the risk factor with the strongest evidence behind it is diabetes.

A 2021 longitudinal cohort study in Frontiers in Clinical Diabetes and Healthcare by Persson Löfgren and colleagues followed 30,357 participants from the Malmö Diet and Cancer Study, with a median follow-up of 23.3 years for those without diabetes and 18.3 years for those with it. During follow-up, 974 participants developed trigger finger. Among those, 7.8% had diabetes at baseline, compared with 4.5% of those who did not develop it. After adjusting for sex, age, body mass index, manual work, statin use, smoking and alcohol, the hazard ratio for diabetes was 2.0 (95% CI 1.5 to 2.6).

The Cureus review puts the prevalence among people with diabetes at up to 20%, and notes that multiple digits are more often involved in that group.

That matters for two practical reasons. If you have diabetes and a catching finger, tell the clinician treating each about the other. And diabetes changes what to expect from treatment: the Cureus review reports that people with type 2 diabetes had 66% success with corticosteroid injection compared with 90% in people without diabetes.

Manual work is a contributing factor rather than the whole story. The Cureus review lists healthcare workers, manual labourers, office workers and musicians as facing increased risk from prolonged forceful gripping and repetitive finger movements. Plenty of people with heavy-gripping jobs never develop it, and plenty of desk workers do. Occupation is one input among several.

Trigger finger also travels with other hand conditions. If you have one, it is worth asking about the others, because they respond to different things. Carpal tunnel syndrome involves nerve compression at the wrist and causes numbness rather than catching. De Quervain tenosynovitis affects tendons on the thumb side of the wrist and hurts with thumb and wrist movement together. Thumb base osteoarthritis is a joint problem at the base of the thumb, with pain on pinch and grip.

How it is graded, and why the grade drives the plan

Clinicians grade trigger finger by how much the finger still moves and whether it can be straightened. The Cureus review describes the Quinnell system as the one more frequently used in clinical and research settings. It runs across five grades, from grade 0 for normal movement, through grades I to III for progressive restriction, to grade IV for a fixed deformity.

In plain terms, the questions that decide your grade are these:

• Does the finger feel uneven or painful, without actually catching?
• Does it catch, but you can straighten it yourself?
• Does it lock, and you need the other hand to unlock it?
• Is it stuck in a bent position that will not straighten at all?

The grade matters because it sorts the treatment path. An irritable finger that catches and releases on its own is where splinting, load changes and gliding work have room to help. A finger that must be unlocked manually every time has less room. A finger fixed in a bend has passed the point where conservative care realistically resolves it, and StatPearls lists an irreducibly locked trigger finger as one of the circumstances warranting surgical release.

Grade is also a moving target. Fingers get worse over months and can improve. The grade is a snapshot that tells you which conversation you are having today.

What conservative care can do, and what it cannot

Here is the honest boundary. Physiotherapy does not widen the A1 pulley and does not shrink a thickened tendon. What it can do is reduce how often the tendon is forced through an irritated tunnel, calm the surrounding tissue, and keep the finger and hand moving.

Splinting has the best conservative evidence. StatPearls describes a splint that blocks the knuckle joint at 10 to 15 degrees of flexion, worn for 6 to 10 weeks. The Cureus review reports recommended splinting lengths ranging from 3 to 12 weeks, averaging 6 weeks, and notes that overnight splinting of the knuckle joint in acute-onset cases achieved complete resolution of symptoms in 55% of patients. The logic is simple: block the joint that produces the snag, and the tendon stops repeatedly forcing through the narrowing.

Activity modification targets the specific aggravator. A wide, soft grip loads the pulley less than a narrow, hard one. Padding a tool handle, changing how you carry bags, switching a pen, and breaking up long gripping tasks all reduce total load on the pulley. This is about finding your particular trigger rather than avoiding using the hand.

Tendon gliding exercises keep the tendon moving through its sheath and maintain motion in the finger joints. They are gentle and done within a comfortable range, without forcing through a catch. Forcing a locked finger straight repeatedly tends to irritate the tissue further.

What conservative care does not do: it does not reliably resolve a finger that locks and has to be manually released, and it does not fix a fixed deformity. If 6 to 10 weeks of honest splinting and load change has not shifted things, that is useful information rather than a failure. It tells you and your physician that the next step is a medical one.

A physiotherapist also has a role after a medical procedure, which people often miss. Once an injection settles a finger or a surgeon releases the pulley, restoring full motion, grip strength and confidence in the hand is physiotherapy work.

When injection becomes the usual next step

Corticosteroid injection into or around the tendon sheath is the standard next step when splinting and load change have not resolved things. It is a physician decision and a physician procedure. A physiotherapist can tell you that you have reached that point and recommend you see your doctor, and cannot prescribe or perform it.

The evidence is positive and more modest than the enthusiasm around it. A Cochrane systematic review by Peters-Veluthamaningal and colleagues pooled two randomised controlled trials with 63 participants in total, comparing corticosteroid plus lidocaine against lidocaine alone. Corticosteroid injection was more effective on treatment success at four weeks, with a relative risk of 3.15 (95% CI 1.34 to 7.40) and a number needed to treat of 3. In plain numbers the review puts it this way: 37 out of 100 people benefited from the corticosteroid injection combined with a painkiller, compared with 17 out of 100 following injection with the painkiller alone.

The review authors graded this as silver level evidence and stated that effectiveness was studied in only two small randomised controlled trials of poor methodological quality. No adverse events were reported in either study, though the reviewers noted it was unclear whether adverse effects were systematically assessed.

Larger observational series report higher figures. The Cureus review states that corticosteroid injections achieve symptom resolution in 70% to 90% of patients without diabetes, and that 70% of trigger digits achieved complete symptom resolution at a mean follow-up of eight years. Those are observational numbers rather than randomised ones, which is worth holding in mind.

There is a ceiling on repeat injections. The Cureus review notes a recommended interval of at least four months between treatments and states that steroids can be safely administered up to three times in the same digit before surgery. StatPearls advises avoiding a fourth steroid injection. Recurrence rates climb with repeated injections, which is part of why the count is capped.

When surgery is considered

Surgical release of the A1 pulley is the definitive treatment, and the surgeon divides the pulley so the tendon runs freely. StatPearls lists three circumstances that warrant it: lack of improvement with splinting and injection treatment, an irreducibly locked trigger finger, and trigger thumb in infancy.

The Cureus review reports a recurrence rate of 2.39% for open trigger finger release, and a success rate of 91% to 100% for ultrasound-guided percutaneous approaches. Whether an open, percutaneous or endoscopic technique suits your finger is a decision for the surgeon, based on your anatomy, grade, and other conditions.

In British Columbia this route runs through your family doctor or nurse practitioner, who refers to a hand surgeon or plastic surgeon. Medically necessary surgery is covered by the Medical Services Plan, while wait times vary by region and urgency. Physiotherapy after the procedure is usually paid by extended health benefits or out of pocket, since MSP covers physiotherapy only for patients who qualify for supplementary benefits.

If the finger locked up at work or you believe the work caused it, a claim through WorkSafeBC is worth asking about. Report it to your employer and your physician, and let the claim decision follow the medical assessment rather than assuming the answer either way.

What a first visit looks like

A first physiotherapy assessment for a catching finger is mostly hands and history. Your therapist will ask when it started, whether it locks, whether you have to use the other hand to release it, what it is like in the morning compared with the evening, and what grips set it off at work or at home. They will ask about diabetes, thyroid conditions, and inflammatory arthritis, since each changes the picture.

Then they will feel for a tender nodule at the base of the finger on the palm side, watch the finger move actively through a full fist and back, and check whether the catch can be reproduced and released. They will grade what they find, screen the wrist and the other hand conditions that share territory with this one, and test grip.

You should leave with three things: a clear statement of which grade you are at, a splint or a splinting plan with a wearing schedule, and a short list of specific grip changes for your actual daily tasks. You should also leave knowing what would move you into the injection or surgery conversation, so that a review in 6 weeks is a decision point rather than another appointment.

Physiotherapy is a direct-access profession in British Columbia, regulated by the College of Health and Care Professionals of BC, so no physician referral is needed to book an assessment. Some extended-health plans require a referral for reimbursement, so check with your insurer before your first visit.

When to see a doctor rather than book physiotherapy

Some presentations need medical assessment first.

• A finger locked in a bent position that will not straighten at all. That is a fixed deformity, and conservative care is unlikely to resolve it.
• Redness, heat, swelling spreading up the finger or hand, or fever. Infection in a tendon sheath is a surgical emergency and needs same-day medical care.
• An injury that caused it. A cut, puncture or crush to the palm followed by a catching or stuck finger is a different problem from gradual-onset trigger finger.
• Several digits affected at once, or both hands, particularly alongside morning stiffness in other joints, which can point to inflammatory arthritis and belongs with a physician.
• Numbness or tingling in the hand. That suggests nerve involvement, and it needs to be sorted out before a splint is fitted.
• Sudden loss of the ability to bend the finger at all, which may mean a tendon problem other than triggering.

This article is general information, not personal medical advice. A regulated practitioner can confirm whether the patterns described apply to you.

Frequently asked questions

What is trigger finger?

Trigger finger, or stenosing tenosynovitis, is a mechanical problem where a flexor tendon catches as it passes through the A1 pulley at the base of the finger. StatPearls describes it as obstruction of the flexor tendon within its sheath at that pulley, with narrowing of the sheath and thickening at the tendon-sheath interface. The result is a finger that clicks, catches, or locks bent and then releases with a snap. The thumb and ring finger are the most commonly affected digits in adults.

Why is my finger worse in the morning?

Because the tissue around the tendon swells while the hand is still overnight, which makes the fit through the pulley tighter. Many people find the finger is locked or stiff on waking and loosens over the first hour of use. That pattern is characteristic enough that clinicians ask about it directly during assessment.

Does trigger finger go away on its own?

Sometimes, particularly in early, mild cases where the trigger activity is identified and reduced. Many cases persist or progress without treatment, which is why splinting and activity modification are worth trying early rather than waiting. A finger that has already progressed to locking or a fixed bend is less likely to resolve without medical treatment.

Can physiotherapy fix trigger finger?

Physiotherapy can settle an early, irritable trigger finger and can restore motion and grip after an injection or surgery. It cannot widen the pulley or reduce a thickened tendon, so it does not resolve a locked or fixed finger. A physiotherapist can grade the finger, fit or advise on splinting, adjust the grips that aggravate it, and tell you clearly when a physician needs to take the next step.

How long do I need to wear a splint?

StatPearls describes a splint blocking the knuckle joint at 10 to 15 degrees of flexion, worn for 6 to 10 weeks. A 2025 review in Cureus reports recommended splinting lengths from 3 to 12 weeks with an average of 6 weeks, and notes that overnight knuckle-joint splinting in acute-onset cases achieved complete resolution of symptoms in 55% of patients. The exact schedule depends on your grade and what you need the hand to do, so your therapist will set it after assessing you.

Why does diabetes make trigger finger more likely?

The link is well documented, and the mechanism involves changes to connective tissue in people with long-standing high blood sugar. A 2021 cohort study following 30,357 people found an adjusted hazard ratio of 2.0 (95% CI 1.5 to 2.6) for diabetes as a risk factor, after accounting for sex, age, body mass index, manual work, statin use, smoking and alcohol. A 2025 review in Cureus puts prevalence among people with diabetes at up to 20%, with multiple digits more often involved.

Does the steroid injection work as well if I have diabetes?

Less often, based on current reporting. The 2025 Cureus review states that people with type 2 diabetes had 66% success with corticosteroid injection compared with 90% in people without diabetes. Corticosteroid can also raise blood glucose for several days after an injection, so tell the physician performing it that you have diabetes and ask how to monitor afterward.

How many steroid injections can I have?

The 2025 Cureus review states that steroids can be safely administered up to three times in the same digit before surgery, with a recommended interval of at least four months between treatments. StatPearls advises against a fourth steroid injection. If a finger keeps returning after repeat injections, that usually moves the conversation toward surgical release.

Are tendon gliding exercises useful?

They help keep the tendon moving through its sheath and maintain motion in the finger joints, which matters most alongside splinting and load change rather than on its own. They are done gently and within a comfortable range. Repeatedly forcing the finger through a catch or yanking a locked finger straight tends to irritate the tissue further, so the technique your therapist shows you matters more than the repetition count.

When is surgery the right choice?

StatPearls lists three circumstances warranting A1 pulley release: no improvement after splinting and injection, an irreducibly locked trigger finger, and trigger thumb in infancy. The 2025 Cureus review reports a recurrence rate of 2.39% after open release and a success rate of 91% to 100% for ultrasound-guided percutaneous techniques. The decision belongs to a hand surgeon, reached through a referral from your family doctor or nurse practitioner.

Is trigger finger covered by MSP or WorkSafeBC?

Medically necessary surgery is covered by the Medical Services Plan, with wait times that vary by region and urgency. Physiotherapy is covered by MSP only for patients who qualify for supplementary benefits, so most people use extended health benefits or pay out of pocket. If the condition is linked to your work, ask your employer and physician about a WorkSafeBC claim, and let the claim decision follow the medical assessment.

Do I need a referral to see a physiotherapist in BC?

No. Physiotherapy is a direct-access profession in British Columbia, regulated by the College of Health and Care Professionals of BC, so you can book an assessment without a physician's referral. Some extended-health insurance plans require a referral for reimbursement even though the profession does not, so confirm with your insurer before your first visit.

Sources

• Jeanmonod, Tiwari and Waseem, "Trigger Finger," StatPearls, NCBI Bookshelf, updated 2024
• Villarreal Acha et al., "Clinical Review of Trigger Finger in Pediatric and Adult Patients: Evaluation and Management Strategies," Cureus, 2025
• Peters-Veluthamaningal et al., "Corticosteroid injection for trigger finger in adults," Cochrane Database of Systematic Reviews, 2009
• Persson Löfgren et al., "Diabetes Mellitus as a Risk Factor for Trigger Finger: a Longitudinal Cohort Study Over More Than 20 Years," Frontiers in Clinical Diabetes and Healthcare, 2021
• College of Health and Care Professionals of BC, physiotherapist scope of practice
• BC Medical Services Plan
• WorkSafeBC