Trigger Finger: Why Does Your Finger Catch or Lock?

If a finger clicks, catches or becomes stuck as you bend and straighten it, the problem may be trigger finger. The name sounds dramatic, but it usually describes a tendon that is no longer gliding smoothly through a small tunnel at the base of the finger. Mild cases may settle with sensible changes or a splint; persistent or function-limiting symptoms may lead to a discussion about corticosteroid injection or hand-surgery review.

The right next step depends on how long it has been happening, whether the finger can still move fully, how much it interferes with daily tasks and whether another hand condition could explain the symptoms.

Why does the finger catch?

The tendons that bend the fingers pass through a series of pulleys that keep them close to the bone. In trigger finger, the tendon and the first pulley at the base of the digit no longer move smoothly past each other. This can produce a tender spot in the palm, a click during movement or a finger that locks in a bent position and needs help from the other hand to straighten.

Symptoms are often worse in the morning or after repeated gripping. Hand use can aggravate the problem, but that does not necessarily mean work, gardening or sport caused permanent damage. Trigger finger is more common in people with diabetes and can occur with rheumatoid arthritis, although many people have no clear underlying cause.

Diagnosis is usually based on the history and examination. An X-ray or MRI is not routinely required. Ultrasound may be useful when the pattern is unclear or another tendon, joint or lump needs to be considered.

What can you try first?

For mild or recent symptoms, early care aims to reduce repeated painful catching without making the whole hand inactive. Practical options may include:

• temporarily reducing forceful or prolonged gripping that repeatedly triggers the finger
• keeping the finger moving gently within a comfortable range rather than forcing it through a painful lock
• using a fitted night splint or joint-blocking orthosis for a defined trial
• reviewing tool, keyboard, gym or gardening grips that keep the finger tightly flexed for long periods

Splinting research is encouraging for short-term pain and function, but studies use different splints, wearing schedules and definitions of success. That means a splint is a reasonable option, not a guaranteed fix. A hand therapist can help choose and fit one without unnecessarily restricting the rest of the hand.

If pain relief is needed, ask a pharmacist or GP what is appropriate for your health history and other medicines. Pain relief may make the hand more comfortable, but it does not by itself restore smooth tendon movement.

When might a corticosteroid injection help?

A corticosteroid injection around the tendon sheath is a common non-surgical option when symptoms remain painful or limiting. Randomised-trial evidence suggests it improves outcomes for many people compared with control injections, but success estimates vary and symptoms can return. Diabetes, longer-standing symptoms, several affected fingers and more severe locking may change the chance of a durable response.

The aim is to reduce irritation around the narrowed pulley so the tendon can glide more freely. That is a condition-specific use of corticosteroid injection, not evidence that cortisone repairs every painful tendon.

Possible downsides include a temporary pain flare, skin thinning or colour change at the injection site, a temporary rise in blood glucose and, rarely, infection or tendon injury. The choice of medication, target and number of injections should therefore be discussed rather than treated as automatic. Ultrasound guidance can show the tendon and nearby structures, but accurate placement does not guarantee that an injection is the right treatment or that symptoms will not recur.

When is surgical review reasonable?

Surgical release widens the tight pulley so the tendon has more room to move. It may be discussed when the finger remains locked, symptoms substantially limit work or daily life, or a well-delivered non-surgical plan has not provided acceptable improvement.

Release procedures often relieve triggering, but surgery is still a procedure with recovery and potential complications, including scar tenderness, stiffness, infection, nerve injury or incomplete release. The decision should account for the affected digit, symptom severity, other health conditions, previous treatments and the tasks you need the hand to perform.

When should a finger be assessed sooner?

Arrange prompt medical review if the finger is stuck in a bent position and cannot be straightened, or if function is deteriorating quickly. A hot, red and rapidly swollen finger, fever, a recent cut or bite, or severe pain when someone tries to straighten the finger can indicate infection and needs urgent assessment.

Review is also worthwhile when there has been a significant injury, when numbness or weakness accompanies the catching, or when several fingers are affected and an underlying condition such as diabetes or inflammatory arthritis may need attention.

The bottom line

Trigger finger is a mechanical catching problem at the base of a finger or thumb, not simply “wear and tear”. Mild symptoms may improve with temporary load changes or an appropriate splint. Corticosteroid injection can help many people but is not guaranteed, and persistent locking may justify hand-surgery review.

The practical goal is not to collect treatments. It is to confirm that the pattern really is trigger finger, match the least invasive reasonable option to its severity, and reassess if movement or function is not improving.