Carpal Tunnel in Pregnancy: Why It Starts, and Why It Usually Goes

Written by Nigel Chua, hand occupational therapist · 21 years treating fingers, hands, wrists, forearms and elbows · Singapore

Waking at 3am Shaking Your Hands

Carpal tunnel syndrome in pregnancy is compression of the median nerve at the wrist, driven mostly by FLUID, not by damage.

It usually starts in the third trimester, affects both hands more often than one, and wakes you at night with numbness, burning or pins and needles in the thumb, index, middle and half the ring finger.

The majority of cases settle on their own within weeks to months of delivery, which is why the treatment plan here is deliberately more patient than it would be in anyone else.

Why pregnancy does this

The carpal tunnel is a fixed-volume space. Bone on three sides, a tough ligament across the roof, nine tendons and one nerve inside.

Nothing stretches.

Add the fluid retention of late pregnancy and the pressure inside that tunnel rises. The nerve is the softest structure in there, so the nerve is what complains first.

Symptoms peak at night because your wrist drifts into a bent position while you sleep, and pressure inside the tunnel roughly doubles at either end of the bending range. Fluid also redistributes when you lie flat.

Almost everyone describes the same 3am ritual: hanging the hand off the bed, shaking it, running it under the tap. That shaking sign is close to diagnostic.

What it is not

Thumb-side wrist pain that hurts when you lift the baby, with no numbness, is more likely De Quervain’s tenosynovitis — a tendon problem, not a nerve one. Different tissue, different treatment, and it more often appears AFTER delivery than before.

Numbness in the little finger points at the ulnar nerve, not the median. That is a different tunnel entirely.

And swelling that comes on suddenly, with headache, visual changes or upper abdominal pain, is not a hand problem. That is an obstetric one — same day, no waiting.

What actually helps

Night splints. A wrist splint holding the wrist NEUTRAL — flat, not cocked back. Most shop-bought splints hold too much extension; the metal stay usually needs flattening.

Worn every night, both hands if both are symptomatic
Most women notice a difference within 1 to 2 weeks
First-line, no downside, safe throughout pregnancy

Positioning and load. Avoid sustained gripping and sustained wrist flexion. Elevate the hands when resting. Keep the wrist straight while feeding — a pillow under the forearm does more than any exercise here.

Tendon and nerve gliding. Gentle, a few times a day. Helps the nerve move within a crowded tunnel rather than sticking.

Corticosteroid injection. Reserved for severe, sleep-destroying symptoms. Used in pregnancy when needed, and typically buys relief measured in weeks to a few months — often enough to bridge to delivery.

Surgery. Rarely done during pregnancy, and almost never before delivery unless there is progressive weakness or constant numbness.

Intermittent numbness is a nerve complaining. Constant numbness, or a thumb that has lost bulk, is a nerve being damaged — and that one doesn’t wait for the calendar.

The timeline after delivery

Week 1 to 6: fluid shifts; many women improve markedly here
Month 1 to 3: most remaining cases settle, though breastfeeding posture can keep symptoms alive
Month 6: around three in four are symptom-free
Month 12: this is the decision point — symptoms persisting past a year behave like ordinary carpal tunnel, and should be investigated and treated as such

So the window here runs the opposite way to most conditions on this site. Early on, TIME is the treatment. Past twelve months, time stops being a treatment and starts being a delay.

Red flags that override the wait, at any stage: numbness that never lifts, dropping things, visible flattening at the base of the thumb.

Nobody warns you that the hardest part of the third trimester might be your hands. It’s the sequel nobody asked for… but this one does have an ending.