What Is De Quervain's Tenosynovitis?
De Quervain's tenosynovitis is inflammation of the tendons on the thumb side of your wrist. It causes pain when you turn your wrist, grasp something, or make a fist.
The condition affects two tendons that run through a tunnel (sheath) at the base of the thumb. When inflamed, they don't glide smoothly through the tunnel.
Why "Mommy Thumb"?
It's commonly called "mommy thumb" or "new parent thumb" because:
Repetitive lifting of babiesAwkward wrist positions while holding infantHormonal changes postpartumSleep deprivation affecting healingBut it affects many others too—anyone who uses repetitive wrist and thumb motions.
Who Gets It?
Common in
New parents (especially mothers)Office workers (mouse use)MusiciansGamersCrafters (knitting, sewing)Assembly line workersAnyone with repetitive grippingRisk Factors
Age 30-50Female sexPregnancy or postpartum periodRepetitive wrist motionsDirect traumaInflammatory arthritisSymptoms
Classic Presentation
Pain at thumb side of wristSwelling near base of thumbPain with gripping, pinching, twistingPain when making a fist"Catching" or "snapping" when moving thumbPain radiating to thumb or forearmFinkelstein's Test
Fold thumb into palm, make a fist, bend wrist toward pinky side. Severe pain = likely de Quervain's. (Don't do this repeatedly—once is enough!)
Treatment
Rest and Activity Modification
Avoid or modify:
Repetitive thumb motionsTwisting motionsWide gripForceful pinchingFor new parents:
Change how you lift baby (palms up, keep wrist neutral)Use both hands equallyRest when possibleUse nursing pillow for supportSplinting
Thumb spica splint:
Immobilizes wrist and thumbWear at night (definitely)Wear during day activities that aggravate4-6 weeksWhy it works:
Reduces tendon movementAllows inflammation to settlePrevents aggravating motionsIce
15-20 minutesSeveral times dailyReduces inflammation and painNSAIDs
Over-the-counter anti-inflammatoriesHelp with pain and swellingCheck with doctor if breastfeedingExercises
Start when acute pain has settled (often after a week or two of splinting).
Tendon Gliding
Thumb extension/flexion:
Open hand flatTouch thumb to base of pinkyReturn to flat10 reps, gentlyThumb circles:
Gentle circles in both directions10 each wayStrengthening (Later Stage)
Thumb resistance:
Wrap rubber band around fingersSpread thumb away against resistance15 repsGrip strengthening:
Squeeze soft ball gentlyHold 5 seconds10 repsOnly if pain-freeWrist Stretches
Wrist flexor stretch:
Arm out, palm upPull fingers back with other handHold 30 secondsWrist extensor stretch:
Arm out, palm downPull fingers downHold 30 secondsCorticosteroid Injection
When Indicated
Failed 4-6 weeks of conservative treatmentSignificant painCan't do splinting adequately (common with new parents)Effectiveness
70-80% get good reliefMay need repeat injectionSome get lasting cure from single injectionWhat to Expect
Injection into tendon sheathBrief stingMay have temporary flare (1-2 days)Improvement over 1-2 weeksSurgery
Rarely Needed
Most cases resolve with conservative treatment or injection.
Indications
Failed conservative treatment (3-6 months)Failed injectionsSevere, disabling symptomsThe Procedure
Release the tendon sheathOutpatient surgeryLocal anesthesia15-30 minutesRecovery
Splint 1-2 weeksSutures out ~10-14 daysTherapy 2-4 weeksFull recovery 4-6 weeksSuccess rate >90%Prevention
Ergonomics
Neutral wrist position when possibleAvoid wide gripUse palm support for mouseTake breaksTechnique
Lifting baby:
Scoop under bottomKeep wrist neutralUse forearms, not just handsAlternate sidesCarrying:
Support weight with forearmsAvoid carrying by gripping with thumbStrengthening
Maintain general hand and forearm strength to prevent overuse.
Timeline
Typical Recovery
Mild cases: 4-6 weeks with splintingModerate: 6-12 weeksWith injection: often improvement in days, full relief 2-4 weeksPost-surgery: 4-6 weeksWhat Helps Most
Early treatment (don't ignore it)Consistent splintingActivity modificationPatience
De Quervain's is painful and frustrating, especially for new parents who can't exactly stop lifting their baby. A thumb spica splint worn consistently, modifying how you lift and grip, and potentially an injection usually resolve it. Don't suffer in silence—early treatment means faster recovery.