Thumb Side or Little-Finger Side? Two Millimeters, Two Different Problems
Most wrist pain after a busy week settles on its own in 3 to 7 days. Past that, the exact spot that hurts tells you most of what you need to know. Thumb side when you lift thumbs-up: usually De Quervain’s. Little-finger side when you twist or push up: usually the TFCC. Numb fingers at night: the carpal tunnel. And any wrist pain after a fall gets an X-ray before it gets a label.
The wrist is eight small bones, more ligaments per square centimeter than almost anywhere in your body, and a dozen tendons crossing it.
Crowded. Like a Tokyo train at rush hour.
Which is exactly why “wrist sprain” and “wrist tendonitis” get handed out so freely…and why so many of them turn out to be something else, months later.
In the wrist, a few millimeters of difference in where you point can be a completely different diagnosis.
Use one finger of your other hand. Press around until you find the worst spot. Then find it below.
First: the ones that don’t wait
- A fall onto the hand, now tender in the hollow at the base of the thumb: treat it as a scaphoid fracture even if the X-ray was called normal. This one HIDES
- A fall, and the wrist looks bent, or you can’t move it: X-ray today
- Numbness in the fingers that has stopped coming and going: a nerve on a deadline
- Red, hot, swollen, getting worse by the hour: infection or gout. Same day
(The hollow in question: lift your thumb up and back as if hitchhiking. The little dip that appears at the base of the thumb, between two tendons, is the anatomical snuffbox. Tender there after a fall means imaging, not reassurance.)
Thumb side of the wrist
- Two finger-widths above the thumb base, worst lifting a kettle or a baby thumbs-up: De Quervain’s tenosynovitis
- Higher up, a hand’s width above the wrist, sometimes with a squeak: intersection syndrome
- Right where the thumb meets the wrist, grinding when you open jars, usually past 45: thumb base arthritis
- The small hollow at the thumb base, after any fall: scaphoid fracture until imaging says otherwise
If the pain is mostly in the thumb itself rather than the wrist, thumb pain by location goes joint by joint.
Little-finger side of the wrist
- Bites when you turn a doorknob or push up out of a chair, sometimes clicks: TFCC injury
- Along a tendon at the back, or a snap when you turn the palm up: ECU tendinopathy or subluxation
- Ring and little fingers tingling, back of the hand normal: Guyon’s canal syndrome
- Deep in the heel of the palm after a club or bat took an impact: hook of hamate fracture
Back of the wrist
- A deep central ache after a fall that never quite settled: scapholunate ligament injury. The wrist sprain that wasn’t
- The same deep ache with no injury at all, building over months: Kienböck’s disease
- A smooth lump that changes size: wrist ganglion. A hard one that never moves: carpal boss
- Weight-bearing pain in a young gymnast: gymnast’s wrist
A wrist “sprain” that still aches at week six was never just a sprain.
Palm side, into the fingers
Numbness and tingling in the thumb, index and middle fingers, waking you at night, easing when you shake the hand out: carpal tunnel syndrome.
The whole wrist
- After landing on the hand, swollen and bruised: wrist fracture
- Sore after one heavy session, improving daily: probably a wrist sprain, and that page lists the ones that aren’t
- Aching, stiffening and weakening years after an old injury: wrist arthritis. Other kinds of arthritis can start here too: the types, side by side
- Clicks or clunks: painless clicking is almost never a problem. Painful clicking, the location tells you which structure
- Builds through a workday at a desk, settles overnight: wrist pain from desk work
Is it “wrist tendonitis”?
“Wrist tendonitis” isn’t one diagnosis. It’s a bucket.
There are a dozen tendons crossing your wrist, and which one is irritated changes the splint, the exercises and how long it takes. The common ones are De Quervain’s on the thumb side, intersection syndrome just above it, and ECU on the little-finger side. If someone just tells you “tendonitis”, ask WHICH tendon. The full wrist tendonitis guide covers how to tell, what settles it and how long it takes.
The short version
Thumb side lifting thumbs-up: De Quervain’s. Little-finger side twisting: TFCC. Numb fingers at night: carpal tunnel. Any fall: X-ray first, label second.
Improving by day 7, let it finish. Same or worse at day 7, get it assessed. If it started in the last day or two, the first 72 hours covers what to do now.
Found your spot but not sure how long you’ve got? The Closing Window Chart just below maps 15 hand and wrist conditions: open, closing, shut, plus the red flags. One page, free.
Written by Nigel Chua, hand occupational therapist in practice since 2005. Thousands of hands, wrists and elbows assessed and treated. My credentials are here. Every article on this site is written using the Closing Window Method: name the window your condition runs on, find where you are in it, and act while it’s still open. This page narrows the field; it doesn’t examine you. Wrist pain that isn’t clearly improving by day 7 needs assessing.