Understanding a Finger or Thumb That Catches or Locks
Trigger finger (stenosing flexor tenosynovitis) happens when a tendon that bends the finger becomes irritated and thickened where it passes through a tight band of tissue (the A1 pulley) at the base of the finger. The tendon catches as it slides, causing a click, a painful snap, or a finger that locks in a bent position. It is especially common in people with diabetes. A single injection resolves symptoms for many people.
Causes
Repetitive or forceful gripping.
Diabetes, which raises the risk and the chance of needing more than one treatment.
Rheumatoid arthritis and thyroid disease.
Carpal tunnel syndrome, which often occurs alongside it.
Symptoms
Pain or a tender lump in the palm at the base of the finger or thumb.
Clicking, catching, or popping when bending and straightening the finger.
A finger that locks bent and must be straightened with the other hand.
Stiffness that is worse in the morning.
Imaging Studies to Consider
Diagnosis is usually made on exam.
Ultrasound can show tendon and pulley thickening and guide injections.
X-rays are used only if arthritis or another problem is suspected.
Physical Therapy, Home Exercise & Other Conservative Techniques
Physical Therapy
A finger splint that holds the joint straight, often worn at night.
Tendon gliding exercises.
Home Exercise Program
Gentle finger range of motion through a pain-free range.
Avoiding repeated forceful gripping during flares.
Other Studied Techniques
Padded grips for tools.
Blood sugar control for people with diabetes.
Interventional Treatment Options
Corticosteroid injection into the tendon sheath: The most established non-surgical treatment, often done under ultrasound guidance. Many people need only one; a second may be considered if symptoms return.
Platelet-rich plasma (PRP) injection: Evidence for PRP in finger tendon sheaths is more mixed than for De Quervain's tenosynovitis, so it is not usually a first choice here.
Percutaneous or surgical release: For locking or symptoms that persist after injections, we refer to a hand surgeon to discuss releasing the pulley.
Neuromodulation: Spinal Cord & Peripheral Nerve Stimulation
Neuromodulation is not used for trigger finger.
Evidence Base: Guidelines & Levels of Evidence
Corticosteroid injection: Level II · Cochrane review (Peters-Veluthamaningal et al., 2009): two small randomized trials favor steroid plus lidocaine over lidocaine alone
Splinting: Level II · Randomized and prospective studies
Platelet-rich plasma (PRP): Level I · Grade C (weaker for trigger finger) · 2025–26 literature review (outside ASPN 2024 scope); a 2025 hand-tendon review found mixed results for digit flexor sheaths
Surgical release: Level I · Randomized trials; high success rates for refractory cases
Evidence levels and guideline citations above are summarized for general clinical reference based on the literature and major society guidelines available at the time of writing. Guidelines are periodically updated; please verify current recommendations before relying on this summary for clinical decision-making.
Pain Psychology Techniques
Activity pacing for hand-intensive tasks.
Relaxation training to reduce overall muscle tension.
Coping strategies for morning stiffness.
Non-Opioid Medication Options
Anti-inflammatory and analgesic options
NSAIDs like ibuprofen or naproxen for short-term relief.
Acetaminophen.
Topical treatments
Topical diclofenac gel over the palm.
If you have diabetes, a steroid injection can raise blood sugar for a few days; check your levels more often afterward.
Related Procedures
Related Conditions
Talk With Us About Your Options
Call 650-507-4113 or send us a message to schedule a consultation at our Daly City, Los Altos, or Stockton office. We will review what may be causing your pain and walk through the risks, benefits, and alternatives of each option with you.
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This information is provided for general patient education and does not replace individualized medical advice. Please discuss your specific symptoms, diagnosis, and treatment options with your pain management physician.
