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ძვალ-კუნთოვანი BODY HANDBOOK
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Carpal Tunnel Syndrome
Your hand wakes you at 3 AM, every night, for weeks — that's carpal tunnel syndrome, the median nerve being squeezed where it passes through your wrist, not aging or a bad pillow. It is one of the most reliably treatable conditions in medicine. A thirty-dollar wrist splint resolves it for many people. A fifteen-minute operation under local anaesthesia resolves it for almost everyone else. The catch is recognising it early enough that the nerve recovers fully.
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The headline is sleep — the nightly waking ends. Within weeks of a splint or an injection, the numbness fades and the grip comes back. If it gets to surgery, that is a day-procedure with a thin palm scar that fades, and roughly eight or nine in ten people are done with the condition a year later. Wait too long and some of that hand never fully returns; the one thing this article asks is that you act before that point.

Inside your wrist, the median nerve runs through a tight tunnel — a curve of bone for the floor, a thick ligament for the roof, nine flexor tendons crowding alongside the nerve. The tunnel has no give. Anything that swells the contents — irritated tendon sheaths, fluid retention, an inflamed lining — pushes the pressure up against the nerve.

Normal resting pressure inside is essentially zero — two or three millimetres of mercury. A symptomatic carpal tunnel runs ten times that, and bending the wrist drives it past the level at which the nerve's blood supply gets pinched off. That is the early symptom phase: numbness only when you sleep with your wrist curled, only when you grip the steering wheel too long. Over months the nerve's insulation breaks down. Over years the actual nerve fibres start dying. The early stage reverses completely once the pressure comes off. The late stage does not (Werner & Andary 2002).

Who gets it: women about three times more often than men, mostly between forty and sixty, and anyone with something extra inside the tunnel — pregnancy fluid retention (usually third trimester, usually gone within months of delivery), obesity (Shiri et al. 2015), diabetes (around one in seven) (Atroshi et al. 1999), an underactive thyroid, rheumatoid arthritis.

How a doctor confirms it

Three things, in sequence. First, the story — nightly numbness in the thumb, index, and middle fingers, relieved by shaking the hand out. That pattern alone, drawn out on a paper hand diagram, is roughly 80% sensitive and 90% specific (Katz & Stirrat 1990). Second, three quick bedside tests — the doctor taps over the wrist, has you press the backs of your hands together for a minute, then presses firmly on the tunnel — looking for any of them to reproduce the tingling. None is conclusive on its own; together they raise or lower the suspicion.

Third, the test that actually confirms it: nerve conduction studies. Small electrical pulses are sent down the median nerve at the wrist; how fast and how strong the signal arrives on the other side is measured. A delay across the tunnel — compared to the ulnar nerve in the same hand as a control — is the objective fingerprint. A joint practice parameter from the major neurology and physical-medicine societies established this as the standard (Jablecki et al. 2002). The test takes about half an hour, costs a few hundred dollars or is insurance-covered, and feels mildly uncomfortable rather than painful.

Ultrasound is increasingly used as a quick alternative — a swollen median nerve where it enters the tunnel is visible on the screen — with sensitivity around 89% and specificity around 83% (Wong et al. 2004). It is cheaper, faster, and involves no electrical stimuli; the major orthopaedic guideline endorses it as a reasonable adjunct (Graham et al. 2016).

One useful caveat: roughly one in five people with classic clinical carpal tunnel have entirely normal nerve conduction studies. That does not mean they do not have it. It means the disease is mild enough to be hard to capture electrically, and they should still be treated.

What most guides get wrong

It is not from the keyboard. This is the deeply held belief that will not die, and the best evidence does not support it. A systematic review of occupational studies (Thomsen et al. 2008) and a large two-cohort prospective study of computer workers (Mediouni et al. 2015) both failed to find a consistent link between computer or mouse use and carpal tunnel syndrome. The jobs where rates are clearly elevated are heavy repetitive grip with real force (meat processing, vehicle assembly), hand-held vibrating tools (construction, mining), and sustained extreme wrist postures. Office work is not on that list.

Surgery is not a last resort. The treatment ladder is not "splint forever and operate only if you have no choice." For moderate-to-severe disease, surgery is the right answer up front. Waiting too long with a compressed nerve costs you nerve fibres that do not grow back (Graham et al. 2016).

Wrist exercises do not cure it. Stretches, tendon glides, nerve glides, yoga — evidence for any of these as standalone treatment is weak and short-term. They are reasonable add-ons. They are not substitutes for the splint, the injection, or the operation once disease is confirmed.

The little finger is not part of this. The thumb, index, middle, and the thumb-side half of the ring finger are median territory. The little finger and the other half of the ring finger are ulnar — a different nerve, in a different tunnel, with a different operation. If only your pinky is going numb, that is cubital tunnel syndrome at the elbow, not carpal tunnel at the wrist.

What you give up by waiting

Tonight: three in the morning, you are shaking your hand to get the feeling back. You will do it for ten minutes, fall asleep again, do it again at four-thirty. That is the seventh week in a row.

A few months in: people start asking if you are tired. You are — you have not had an unbroken night in months — but you do not quite want to explain that the problem is your hand. Coffee cups slip out because you did not feel them slipping. Typing feels deniable, but the typos have been adding up.

A year or two: look at the pad of muscle at the base of your thumb on both hands and compare. The affected side is visibly flatter. Pinch grip is weak — opening a jar takes both hands now. That muscle wasting can be stopped by decompressing the nerve. Mostly it does not come back (Padua et al. 2016).

Five years untreated severe carpal tunnel: permanent numbness across three and a half fingers, permanent weakness in pinching anything between thumb and finger. Hand dexterity is how you interact with almost every object in your life. Advanced carpal tunnel quietly takes a portion of that off the table.

What to do, in order

For most people, the order is splint, then injection, then surgery — and the further you have to go, the better the result tends to be.

Splint at night. A rigid wrist brace that holds your wrist straight. Worn from lights-out to morning. The Cochrane review puts it modestly: better than no treatment for short-term symptoms (Page et al. 2012). About thirty dollars over the counter. Almost no downside.

Steroid injection if the splint is not enough — your doctor places methylprednisolone into or just outside the tunnel.

Surgical release. A small cut in the palm; the thick ligament forming the roof of the tunnel is divided; the nerve has room. The whole operation takes ten to fifteen minutes under local anaesthesia. Open and keyhole versions have essentially the same long-term result; keyhole gets you back to work a little faster (Vasiliadis et al. 2014). Multiple randomised trials and a Cochrane review confirm surgery outperforms continued conservative care for both symptoms and hand function at a year (Gerritsen et al. 2002) (Jarvik et al. 2009) (Verdugo et al. 2008).

Carpal tunnel itself is not contraindicated in any group — the question is which treatment fits which situation.

Where this goes wrong

Almost always: operating on the wrong problem. A pinched nerve root in the neck, the median nerve compressed up at the forearm, the ulnar nerve at the elbow, and diabetic nerve damage in both hands can all produce hand numbness that looks similar from the outside but is distributed differently and will not respond to wrist surgery. Nerve conduction studies before surgery are the protection against this. Insisting on them is the single highest-yield thing a patient can do.

The other big one: waiting too long. Severe long-standing disease with established muscle wasting recovers only partially. Surgery stops the damage; it does not always restore what is already lost (Padua et al. 2016).

Smaller things to know: post-surgery palm tenderness ("pillar pain") that lingers for months and then resolves; a 3-5% recurrence rate; roughly one in ten people whose symptoms do not fully clear even after a technically successful operation. A failed steroid injection does not mean you do not have carpal tunnel — it tends to mean you are someone who needs the operation.

What changes when you treat it

First night with the splint: most people sleep through. The thing is obvious — a brick of plastic on the back of the hand — but the wrist stays straight, the pressure inside the tunnel stays flat, and the 3 AM wake-up does not come.

Two weeks after a steroid injection: numbness gone, grip strong, your hand feels like your hand again. By month two or three the symptoms tend to creep back; you are either splinting through it or queueing for surgery.

Two months after surgical release for mild-to-moderate disease: roughly eight or nine in ten people report full or near-full resolution (Atroshi et al. 2013) (Jarvik et al. 2009). The scar in the palm is a thin pink line that fades to invisible over months. You stop thinking about your hand.

A year out from surgery: for the vast majority of people the condition is essentially over. The exceptions are people who waited until the nerve was severely damaged — they keep some numbness, some weakness (Padua et al. 2016). The whole lesson of the entry is in the timing.

Specific populations

Pregnancy. Symptoms in the third trimester are common — somewhere between one in ten and one in three pregnancies — driven by fluid retention rather than a permanently swollen tunnel. Most resolve within months of delivery. The default plan is splint plus wait; if symptoms are severe, a steroid injection is reasonable; surgery is deferred unless motor function is rapidly deteriorating (Padua et al. 2016).

Diabetes. About one in seven diabetics has carpal tunnel (Atroshi et al. 1999). It coexists with diabetic nerve disease, which complicates the diagnostic picture, but moderate-to-severe carpal tunnel still warrants surgical decompression in this group.

Underactive thyroid. Treating the thyroid sometimes resolves the carpal tunnel without local intervention. A thyroid panel is worth checking before anything invasive.

Obesity. A BMI of 30 or more roughly doubles the risk (Shiri et al. 2015). Weight loss is not a primary treatment for active carpal tunnel — the timescale does not fit — but it shifts the long-term risk picture.

Adjacent conditions worth recognising as separate from this one:

  • Cubital tunnel syndrome — the ulnar nerve compressed at the elbow. Pinky and ring-finger numbness, worse with the elbow bent.
  • Cervical radiculopathy — a pinched nerve root in the neck, hand symptoms in a broader pattern, often with neck or arm pain.
  • De Quervain tenosynovitis — thumb-side wrist pain, tendons rather than nerve, different treatment.
  • Diabetic peripheral neuropathy — both hands and both feet, glove-and-stocking pattern, not focal.
  • Workstation ergonomics — not actually a cause of carpal tunnel, but a real factor in hand fatigue and posture.
Related in the handbook
Related
  • — Keyboard and mouse position is one of the modifiable loads behind wrist nerve symptoms — straighten the setup first.
  • — Carpal tunnel and frozen shoulder share the same risk soil - diabetes and an underactive thyroid. Having one raises the odds of the other.
  • — An underactive thyroid makes carpal tunnel more likely — worth checking if it's bilateral or unexplained.
  • — Diabetes roughly doubles carpal tunnel risk — high blood sugar leaves the median nerve more vulnerable to compression.
  • — Hand and wrist pain isn't always the nerve — overuse tendinopathies can mimic or sit alongside carpal tunnel.
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