Both cause numb hands.
The difference is the shape of the numbness and which hand it’s in. Carpal tunnel takes specific fingers, usually one hand first, and wakes you at night so you shake it out. A peripheral neuropathy takes both hands symmetrically, in a glove pattern that doesn’t respect any nerve territory… and it almost always started in the feet, months or years earlier, which is the question nobody asks.
The four differences that matter
- Distribution. Carpal tunnel is thumb, index, middle and half the ring finger. A neuropathy is all fingers, in a glove, ignoring the nerve map entirely
- Sides. Carpal tunnel usually starts one-sided or clearly worse on one side. Neuropathy is symmetrical from the beginning
- Feet. This is the decisive question. Neuropathy goes longest-nerve-first, so the feet are numb or burning before the hands. Numb feet plus numb hands is not a wrist problem.
- The shake test. Carpal tunnel wakes you and eases when you shake or dangle the hand. Neuropathy burns steadily and shaking does nothing
Ask about the feet. It is the single most useful question in a numb-hands consultation and it takes four seconds.
What produces a neuropathy
Diabetes is the commonest cause by a wide margin — and it also raises carpal tunnel risk, so plenty of people have both (see the diabetic hand).
Others worth naming because they are treatable: vitamin B12 deficiency, thyroid underactivity, heavy alcohol use, kidney disease, some chemotherapy drugs, and a range of immune conditions.
That list is why the workup is blood tests rather than a wrist scan. A neuropathy is a medical diagnosis with a cause to be found, not a mechanical problem to be released.
Why this matters before surgery
Two practical consequences.
First, operating on a carpal tunnel in someone whose real problem is a generalized neuropathy gives a scar and unchanged symptoms.
Second — and this is the more common situation — someone has BOTH. The release still helps, but the outcome conversation has to be honest: the mechanical part improves, the neuropathic part doesn’t. People told this beforehand are satisfied at three months. People not told feel the operation failed.
Nerve conduction studies can usually separate the two, which is one of the few situations where the test genuinely changes the plan.
What gets done about it
- Find and treat the cause. Glucose control, B12 replacement, thyroid treatment, alcohol reduction. Some neuropathies improve substantially when the driver is fixed, particularly B12
- Protect the hands. Reduced sensation means burns and cuts go unnoticed. Check the hands visually, be careful with hot water and sharp tools
- Treat the symptoms. Neuropathic pain responds to specific medications rather than ordinary painkillers — that’s a GP conversation
- Keep using the hands. Dexterity and strength decline faster from disuse than from the neuropathy itself
Go and get bloods done if
- Both hands are affected symmetrically
- Your feet are also numb, tingling or burning
- The numbness doesn’t fit any single nerve’s territory
- It’s spreading upwards over months
- You’re losing balance in the dark, or tripping
Carpal tunnel is a plumbing problem in one place.
A neuropathy is a systems problem showing up at the far ends first — and the far ends include your feet.
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.