What is trigger finger?

The tendons that bend the fingers pass through a series of pulleys in the palm and finger that hold them close to the bone, like fishing line through the eyelets of a fishing rod. The first of these pulleys, the A1 pulley, sits at the base of the finger in the palm. In trigger finger, either the tendon thickens (developing a small nodule) or the pulley itself becomes thickened, so the tendon no longer glides smoothly through it.

The result is that as the finger bends, the nodule passes through the pulley with a snap. When the finger is straightened the nodule can become caught on the other side of the pulley, locking the finger in a bent position. Patients often describe needing to use the other hand to forcibly straighten the finger, sometimes with an audible snap. In severe cases the finger can no longer be straightened at all.

The thumb, ring finger and middle finger are most commonly affected. It is much more common in patients with diabetes, up to one in ten diabetic patients are affected, and outcomes from injection are slightly less favourable in this group. In children, congenital trigger thumb is a separate condition that presents in infancy.

Common causes

Idiopathic in most adults
Diabetes mellitus, the strongest single risk factor
Repetitive forceful gripping, tools, sports
Rheumatoid arthritis and other inflammatory conditions
Hypothyroidism, gout, and amyloidosis (rarer associations)

Who is at risk? Diabetes is by far the most important risk factor. Female sex, age 40-60, and inflammatory arthritis also increase risk. Manual workers and musicians may present earlier.

Symptoms

Symptoms vary depending on the severity and duration of the condition. Common symptoms include:

A catching, clicking or snapping sensation as the finger is bent or straightened
Pain or tenderness in the palm at the base of the affected finger
A small lump that can sometimes be felt over the A1 pulley
The finger locking in a bent position, requiring the other hand to straighten it
Stiffness, particularly in the mornings, that improves with gentle movement
In advanced cases: the finger cannot be straightened at all (fixed flexion)

When to seek help: See your GP or hand specialist if the finger is regularly locking and you have to use the other hand to straighten it, if pain is interfering with daily life, or if the finger has become permanently bent and you cannot straighten it.

How is it diagnosed?

Your hand surgeon will take a detailed history and examine the hand and wrist. The following investigations may be arranged to confirm the diagnosis:

Clinical examination, a palpable nodule and tenderness at the A1 pulley, reproduction of the triggering
Assessment of finger range of movement and any fixed contracture
Screening for diabetes if not already known, as it strongly affects management
Ultrasound, useful in atypical cases or for injection guidance
Imaging is not routinely required

In adults the diagnosis is almost always clinical. Investigation is reserved for atypical presentations, multiple digits, or unusual locations. New-onset multiple trigger digits should prompt screening for inflammatory arthritis, diabetes and amyloidosis.

Treatment pathway

Treatment is tailored to the severity of the condition, your age, activity level, and overall health. Most conditions are treated in a stepwise fashion, starting with the least invasive options.

First line

Splinting and activity modification

A small splint worn at night holding the metacarpophalangeal joint extended can break the cycle of triggering. It is more effective in early or mild cases and may need to be worn for 6-8 weeks. Anti-inflammatory medication can help with pain.

Second line

Corticosteroid injection

An injection of corticosteroid into the flexor tendon sheath is highly effective, around 60-70% of cases resolve with a single injection in non-diabetic patients, slightly less in diabetic patients. A second injection can be considered if the first only partly worked. Repeated injections are avoided.

Surgical option

A1 pulley release

A short procedure under local anaesthetic. A small incision in the palm allows the A1 pulley to be divided, freeing the tendon to glide freely. It has a success rate of over 95% and is offered when injections have failed, in diabetic patients, or where the finger is locked. Can be done as a percutaneous procedure in some centres.

Recovery

After A1 pulley release the wound is sore for a week or two, but most patients can move the finger freely from day one. Gentle hand exercises encourage tendon gliding and prevent stiffness. Wound healing takes 2 weeks; full grip strength returns over 6-12 weeks.

Splint trial: 6-8 weeks
Symptom relief after injection: within 2-3 weeks
Return to normal use after surgery: 2-3 weeks
Full recovery of grip and movement: 6-12 weeks

What results can I expect?

Excellent. Most non-diabetic patients are cured by one or two injections; the rest are cured by surgery. Recurrence after surgical release is uncommon. Diabetic patients have slightly lower injection success rates and more often proceed to surgery.

In numbers

Diabetes

is the main risk factor[1]

patients with diabetes have a several-fold increased risk

Ring

finger most often affected[1]

followed by the thumb and middle finger

Often

responds to injection[1]

corticosteroid injection helps the majority of non-diabetic patients

Day

case surgery[1]

A1 pulley release is a quick day-case operation when needed

What the evidence shows

The condition is caused by a mismatch between the flexor tendon and the A1 pulley at the base of the finger, the tendon catches as it passes through, producing the classic clicking or locking[1]

Patients with diabetes tend to have a less reliable response to corticosteroid injection and may proceed to surgery sooner[1]

Surgical release of the A1 pulley is generally curative and recurrence is uncommon when the release is complete[1]

In children, trigger thumb is a separate condition with a different natural history, many cases resolve spontaneously[1]

When can I…?

Typical activity timelines for this condition. These are approximate and vary considerably between patients. Always follow the specific guidance given by your surgeon and hand therapist.

Activity	Typical timeline	Notes
Drive	2-3 days after surgery	When you can grip the wheel comfortably.[2]
Shower	When dressing is waterproof	Most dressings stay on for 10-14 days.
Desk work	Within a few days	Light keyboard and writing work as comfort allows.[1]
Manual work	2-4 weeks after surgery	Heavy gripping and tools usually wait until tenderness in the palm has settled.[1]
Sport / gym	4-6 weeks after surgery	Avoid heavy gripping (golf, racquet sports, weights) until the palm wound is fully comfortable.
Make a full fist	Days to weeks	Active finger movement immediately after surgery is encouraged to prevent stiffness, ideally with hand therapy guidance.[3]

Is this normal?

Common concerns from patients with this condition or recovering from treatment, and whether they are expected or worth mentioning to your team.

It is worth mentioning. Complete A1 pulley release usually relieves triggering immediately. Mild residual catching can occasionally be due to a thickened tendon or proximal pulleys, and is worth reviewing if it persists beyond 4-6 weeks.[1]

Yes. Palm tenderness at the site of the small wound is very common for several weeks. It settles steadily and most patients have a comfortable grip by 6-8 weeks.[1]

Yes, early on. Brief morning stiffness for a few weeks after surgery is common, particularly if you had a fixed trigger before surgery. Daily finger movement helps it settle.[3]

Yes, this can happen. Trigger finger commonly affects more than one finger over time, and treating one does not prevent another developing. The new finger can be treated the same way.[1]

References & further reading

References are to UK clinical guidance and patient information from recognised organisations. This page is for general information and does not replace personalised advice from your own clinical team.

Trigger finger