Trigger Finger Causes, Symptoms & Treatment Options
Trigger finger, medically known as stenosing tenosynovitis, is a painful hand condition that causes the finger or thumb to lock, catch, or snap when bending or straightening. It develops when inflammation narrows the space around the tendon, preventing smooth movement. Symptoms can range from mild stiffness to the finger becoming stuck in a bent position, and may affect daily activities and sports performance.
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Trigger finger, or stenosing tenosynovitis, occurs when the flexor tendon becomes irritated or inflamed as it passes through its protective sheath. In severe cases, the finger may lock in a bent position and require force to straighten. While this condition is not the same as a finger fracture, trauma to the hand—including fractures—can increase the risk of developing trigger finger due to swelling and tendon irritation.
How Flexor Tendons Are Involved
Flexor tendons are long, fibrous cords that connect the muscles of the forearm to the bones of the fingers and thumb. These tendons normally glide smoothly through a tunnel-like sheath when you move your fingers. When inflammation develops, the tendon cannot glide freely, resulting in pain, stiffness, and the characteristic snapping or catching sensation seen in a trigger finger.
What causes Trigger Finger?
The exact cause of trigger finger is not always known, but several factors increase the likelihood of developing the condition.
1. How the Injury Occurs
Trigger finger often develops due to repetitive strain or overuse of the hand. Repeated gripping, forceful finger movements, or sustained pressure on the palm can irritate the tendon sheath, leading to inflammation and narrowing.In some cases, a direct injury or trauma to the hand or finger—such as a fall, impact, or crush injury—can also cause this condition.
2. Common Everyday Causes
- Repetitive hand use at work or home
- Prolonged gripping of tools or devices
- Previous hand injuries, including a finger fracture
- Medical conditions such as diabetes, gout, or rheumatoid arthritis
Trigger Finger Is Most Common in These Sports
- Racket sports (tennis, racquetball, squash) require repeated gripping and wrist motion
- Golf, where forceful gripping of the club places stress on the fingers and thumb
Athletes who rely heavily on grip strength are particularly prone to trigger finger.
Symptoms
Trigger finger symptoms often develop gradually and may worsen over time, especially with continued hand use. Common symptoms include:
- Pain and swelling at the base of the finger or thumb, often near the palm
- Tenderness or a small lump where the finger meets the palm, caused by tendon thickening
- Clicking, snapping, or catching when bending or straightening the finger
- Finger locking, where the finger becomes stuck in a bent position and may suddenly release
Symptoms are usually worse in the morning and may temporarily improve with movement.
When to see a doctor
If your symptoms persist, worsen, or interfere with daily activities or sports, you should see a doctor. Early evaluation is important to prevent long-term stiffness or loss of motion. Your doctor will review your medical history, including any prior hand injuries such as a finger fracture, and examine your hand for swelling, tenderness, nodules, and finger locking.
Non-operative treatment
Some cases of trigger finger improve with conservative trigger finger treatment, especially when addressed early.
Non-Surgical Treatment Options Include:
- Rest: Avoid activities that require heavy gripping or repetitive finger use
- Splinting: Wearing a splint, particularly at night, helps keep the finger extended and allows the tendon to rest
- Medication: NSAIDs like ibuprofen can reduce pain and inflammation
- Steroid Injections: Corticosteroid injections reduce tendon swelling and often resolve triggering
- Physical Therapy: Gentle stretching and strengthening exercises improve flexibility and reduce stiffness
(Refer to the PDF exercise program below.)
Surgical Treatment
If non-operative trigger finger treatment does not relieve symptoms, surgery may be recommended. The procedure involves releasing the tight tendon sheath at the base of the finger or thumb, allowing the tendon to glide freely again.
Pain relief and improved motion are typically noticed soon after surgery, though mild soreness may persist for several months.
Recovery
Most patients can move their fingers immediately after surgery. Swelling and tenderness gradually resolve, and occasionally hand therapy may be recommended to restore full motion and strength. Athletes can usually return to activity once pain subsides and normal finger function is restored.
Dr. Jay Kimmel is a board-certified orthopedic surgeon specializing in sports medicine, arthroscopic surgery, and shoulder and knee disorders. He completed his orthopedic training at New York-Presbyterian/Columbia University Medical Center and a Sports Medicine Fellowship at Temple University.
Dr. Kimmel previously served as the Director of the Connecticut Sports Medicine Institute at Saint Francis Hospital and has held faculty appointments as Clinical Assistant Professor in the Departments of Orthopedics and Family Medicine at the University of Connecticut. He has extensive experience caring for athletes as a team physician for high school and collegiate programs and continues to teach in the athletic training departments at Westfield State University and Springfield College.
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/MonthFrequently Asked Questions
Is trigger finger a permanent condition?
No. With proper treatment, most people experience full recovery and return of finger motion.
Will I be able to use my hand after treatment?
Yes. Both non-surgical and surgical treatments aim to restore normal hand function.
Can trigger finger occur in the thumb?
Yes. Trigger finger thumb is common and causes similar locking and pain symptoms.
Can I stay active with trigger finger?
Light activity is usually safe, but avoiding repetitive gripping and strain is important during recovery.