Tip, Middle Joint or Knuckle? Each Joint Has Its Usual Suspects
Most finger pain after a knock or a busy week settles in 3 to 7 days. Past that, which joint hurts and how it started tells you most of the story. Jammed, and the middle joint is swollen: usually a sprain. Jammed, and the tip now droops: mallet finger. No injury, knobbly end joints, past 45: usually osteoarthritis. A click or lock at the base on the palm side: trigger finger. Several joints swollen on both hands and stiff for over an hour every morning: that needs a doctor and a blood test, not a wait.
Here’s the trouble with finger pain.
It’s small. So people treat it small.
Tape it, ignore it, “give it another week”…and another…
And most of the time that’s fine. But a few finger problems run on a clock measured in DAYS, and by the time they look bad enough to bother with, the easy fix is gone.
Each finger has three joints: the knuckle, the middle joint and the end joint (how they work). Different problems favor different joints.
Point at the exact joint…and you’ve done half the diagnosing.
Find the one that hurts most. Then find it below.
First: the ones that don’t wait
- After an injury, the finger crosses over its neighbor when you make a fist: a rotated broken finger. Rotation never corrects itself as it heals
- Grabbed a jersey or a ledge, and now the fingertip won’t bend: jersey finger. A hand surgeon within DAYS, not weeks
- A cut, and now the finger won’t bend or won’t straighten: a flexor or extensor tendon injury. Today
- A cut, and now part of the finger is numb: a nerve may be cut. Today
- Red, hot, swollen like a sausage, agony to straighten, especially after a cut, a thorn or a bite: infection. Same day
(Quick check you can do right now: make a loose fist and look at your fingernails. They should all point roughly toward the same spot at the base of your thumb. One nail tilted off on its own after an injury…that’s the rotation we’re talking about.)
The fingertip and end joint
- After a jam, the tip droops and won’t straighten on its own: mallet finger. A splint, worn full time, starting NOW
- Hard, knobbly bumps on the end joints, usually past 45, aching after use: finger osteoarthritis (Heberden’s nodes)
- A small pearly cyst between the end joint and the nail, sometimes with a groove down the nail: a mucous cyst
- Throbbing, red swelling beside the nail, or a tense, swollen fingertip pad: paronychia or felon
- Crushed in a door: nail bed injury and crushed fingertip
The middle joint
The middle joint takes the most jams.
It’s also the joint that stiffens FASTEST if it’s handled wrong…splinted straight for too long, or ignored while it swells.
- Jammed, swollen, sore on one side: a collateral ligament sprain. Start with jammed finger: sprain or something worse
- Bent back or dislocated, now swollen and won’t fully straighten: a PIP sprain or dislocation. If it still looks bent out of shape, rule out a fracture-dislocation
- Weeks after a jam, the middle joint sits bent and the tip bends back: boutonnière deformity. The opposite shape, middle joint bent back and tip bent down: swan neck
- Bony bumps on the middle joints, no injury: osteoarthritis (here they’re called Bouchard’s nodes)
A jammed finger gets better. A jammed finger that’s ignored gets STIFF.
The knuckle
- After a punch, the knuckle has dropped and the back of the hand is swollen: a metacarpal fracture. Many heal in a brace that keeps the fingers moving
- Knuckles swollen on both hands, stiff for over an hour after waking: an inflammatory arthritis such as rheumatoid arthritis until a doctor says otherwise. See also stiff, swollen fingers in the morning
- One joint suddenly hot, red and exquisitely painful, often overnight: gout
The palm side, at the base of the finger
- A tender nodule, a click or a lock when you bend, worst in the morning: trigger finger
- A small hard pea under the skin at the crease, sore when you grip: a seed ganglion
- A painless cord or lump in the palm, slowly pulling the finger bent: Dupuytren’s contracture. Painless…which is exactly why people wait too long
The whole finger
- Swollen end to end like a sausage, with psoriasis or pitted nails: psoriatic arthritis (dactylitis)
- You can’t make a full fist: the causes, joint by joint
- Diabetic, with stiff fingers or more than one trigger finger: the diabetic hand
- Tingling or numbness, not pain: that’s a nerve, and which fingers tell you which one. Pins and needles: which nerve
Painful finger joints with no injury: wear or inflammation?
Two patterns cover most of it.
And they need very different things, so this sorting matters more than anything else on the page.
Wear (osteoarthritis): end and middle joints, hard bony bumps, usually past 45, aches after use, morning stiffness that loosens in MINUTES. Managed well, this one plays out over years, and hand therapy helps a lot: splints, exercise, joint protection. More in hand osteoarthritis.
Inflammation (rheumatoid, psoriatic): knuckles and middle joints, soft puffy swelling, often both hands at once, stiffness lasting an HOUR or more, any age. This needs a doctor and blood tests first. Treated early, the joints are protected. Left for a year…the damage stays.
And one joint going hot and red overnight is neither. That’s gout or infection.
Not sure which type of arthritis you’re dealing with? Types of arthritis in the hand sorts them side by side.
The short version
Jammed middle joint: sprain. Drooping tip: mallet, splint now. Knobbly end joints: wear. Click at the base: trigger finger. Puffy knuckles on both hands, stiff for an hour: see a doctor this week. Finger crossing over when you make a fist: today.
Your fingers aren’t Wolverine’s…they don’t heal properly just cos you ignored them long enough.
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. If it’s the thumb, thumb pain by location.
Still not sure whether your window’s open…or already closing? The Closing Window Chart just below maps 15 hand conditions: open, closing, shut, plus the red flags. One page. Free. Grab it before you decide to give it “another week”.
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. Finger pain that isn’t clearly improving by day 7 needs assessing.