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Both Numb Your Hands. Only One Started in Your Feet.
Carpal tunnel numbs the thumb, index, middle and half the ring finger, usually one hand worse than the other, wakes you at night and eases when you shake the hand out. Peripheral neuropathy numbs both hands evenly, in a glove pattern that ignores nerve territories, and it almost always started in the FEET first, months or years earlier.
So the quickest test is one question: are your feet numb, tingling or burning too? A nerve conduction study and a few blood tests settle the rest, including the common answer, which is both.
Both cause numb hands. That’s where the similarity ends.
You’ve got fingers that feel wrapped in cotton wool, buttons that take longer than they should, and a search history full of “carpal tunnel”. Fair enough. It’s the most common nerve compression in the arm.
But get this one wrong and it costs you twice. A wrist operation on a hand whose real problem is a neuropathy leaves you with a scar and the same numbness. And a neuropathy blamed on the wrist means the actual cause, sometimes something as fixable as low vitamin B12, keeps quietly damaging nerves while everyone stares at your carpal tunnel.
Here’s how to tell them apart.
How do I know if it’s carpal tunnel or neuropathy?
The difference is the shape of the numbness and which hand it’s in. Four things separate them.
- Distribution. Carpal tunnel is thumb, index, middle and half the ring finger, and the little finger is spared. 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. More on that pattern in hands numb at night.
Ask about the feet. It is the single most useful question in a numb-hands consultation and it takes four seconds.
A two-minute check you can do at home
This doesn’t diagnose anything. It gives you a much better story to bring to your doctor.
- Map it. Lightly stroke each fingertip with a fingernail, then compare with the other hand. Write down which fingers feel different. Carpal tunnel draws a line through the ring finger. Neuropathy doesn’t draw lines.
- Check the little finger. If the little finger is fine and the thumb side is numb, that points at the wrist. If the little finger is just as numb as the rest, think bigger.
- Wrist-bend test. Let both hands hang with the backs of the hands pressed together, wrists bent, for 60 seconds. Tingling that builds in the thumb-side fingers points at carpal tunnel. Nothing changing doesn’t rule it out.
- Socks off. Do the same light-touch check on your toes and the soles of your feet. Notice burning, tingling, or a feeling of walking on sand.
(Bring that written map to the appointment. A drawn-on hand outline is worth more than “it’s sort of all numb”.)
What causes peripheral neuropathy in the hands?
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.
How is it diagnosed?
- History and examination. Where the numbness is, which side, whether the feet are involved, what wakes you. Strength of the thumb muscles. Reflexes and sensation in the feet.
- Nerve conduction studies. Small electrical signals timed along the nerves. Carpal tunnel shows a slowdown at one spot, the wrist. A neuropathy shows a slowdown everywhere, worse the further from the spine. This is one of the few situations where the test genuinely changes the plan. See nerve conduction results explained.
- Blood tests. Typically blood sugar (including a three-month average), B12, thyroid function and kidney function, with others added depending on your history. Your doctor orders those.
Can you have carpal tunnel and neuropathy at the same time?
Yes. It’s common, especially with diabetes.
A nerve that’s already struggling from a neuropathy copes worse with being squeezed at the wrist. So a mild carpal tunnel can feel bigger than it looks, and the two sets of symptoms layer on top of each other.
The giveaway is usually a mix: glove-like background numbness in both hands, plus the night waking and shake-it-out relief of carpal tunnel on top, often worse in one hand.
Will carpal tunnel surgery help if I have neuropathy?
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.
So the useful pre-surgery question is: “Which of my symptoms do you expect this to fix, and which will stay?” The night waking and shake-it-out tingling usually settle. The glove-like background numbness usually doesn’t. If you’re already past surgery and wondering why, see still numb after carpal tunnel surgery, and for the normal timeline, carpal tunnel release recovery.
Which window are you in?
Both conditions run on a clock. Different clocks.
- Carpal tunnel, intermittent numbness (window open). Tingling that comes and goes, mostly at night. Splints and nerve glides have time to work.
- Carpal tunnel, constant numbness or a thinning thumb base (window closing). Numbness that never switches off, or the fleshy pad at the base of the thumb flattening. Once that muscle has wasted, it may not fully come back even after surgery. This one doesn’t wait.
- Neuropathy from a fixable cause (window open, but it’s ticking). B12 deficiency caught early often improves a lot once replaced. Left for a long time, some of the nerve damage can become permanent.
- Long-standing neuropathy (window shut on full feeling). The goal changes, not the effort: protect the skin, keep the hands strong and skilled, stop it progressing by controlling the cause.
What helps neuropathy in the hands?
- 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. Look at your hands every evening for cuts, blisters or redness. Test bath and dish water with your elbow or a thermometer, and set the water heater to 120°F (49°C) or lower. Use oven mitts that cover the wrist.
- Treat the symptoms. Neuropathic pain responds to specific medications rather than ordinary painkillers. Your doctor or specialist chooses those.
- Keep using the hands. Dexterity and strength decline faster from disuse than from the neuropathy itself.
- Practice the fiddly stuff. Five minutes, twice a day: pick up coins one at a time and stack them, do up and undo a row of buttons, turn a pen end over end between your fingers. Look while you do it. Your eyes fill in some of what your fingertips can’t feel.
- Grip work. Squeeze soft therapy putty or a rolled towel, 10 slow squeezes, hold 3 seconds each, twice a day. Thicker handles on cutlery and pens make the most of the grip you’ve got.
If the carpal tunnel part is real too, treat it in parallel: a neutral night splint worn every night for 6 to 8 weeks is the usual first step.
Can I keep working and driving with numb hands?
- Desk work: usually yes. A larger mouse and a keyboard you don’t have to grip hard help.
- Tools, knives, hot equipment: yes, with care. Look at what your hands are doing, cos you can’t trust them to report a slip or a burn.
- Fine work (small screws, jewelry, sewing): expect it to be slower. Bigger grips and better lighting buy back a lot.
- Driving: if you can hold the wheel firmly and feel the pedals properly, most people carry on. Numb FEET matter more for driving than numb hands. If you’re unsure, ask your doctor before you drive.
Go to the ER if
- Numbness or weakness came on suddenly in one arm, especially with face drooping, slurred speech or a leg affected. Call emergency services.
- Numbness and weakness are spreading up from the feet and hands over days, or you’re struggling to walk or breathe.
Get it checked 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.
- The numbness is now constant, or the fleshy base of your thumb is getting flatter.
- You’ve found a cut, burn or blister on your hand you didn’t feel happen.
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.
Written by Nigel Chua, hand occupational therapist in practice since 2005. Thousands of hands, wrists and elbows assessed and treated. My credentials are here. This article explains; it doesn’t examine. Numb hands with numb feet deserve blood tests before anyone talks about the wrist.
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.