Almost everyone has woken with a hand that has gone to sleep. What matters is which part of the hand, whether it is one hand or both, and whether it keeps happening. Each nerve supplies its own territory, so the numb fingers usually name the culprit before any test is ordered. Most often it is a nerve pressed at the wrist or elbow, and that usually improves with simple steps such as a night splint.
Numbness, tingling or pins and needles: start with which fingers
Hand numbness is a symptom, not a diagnosis. The nerves that reach the hand travel from the neck, through the shoulder, down the arm, and past two narrow points where they are easily squeezed, at the elbow and the wrist. Pressure at any of those places produces numbness, and each place produces its own pattern.
| Where the numbness is | Most likely source | What tends to go with it |
|---|---|---|
| Thumb, index, middle, half the ring finger | Median nerve at the wrist, carpal tunnel | Wakes you at night; shaking the hand helps |
| Little and ring fingers | Ulnar nerve at the elbow | Worse with the elbow bent or leaned on |
| A stripe from the neck into set fingers | Nerve root in the neck | Neck or shoulder-blade pain; changes with neck position |
| Whole hand, both sides, and both feet | Peripheral neuropathy | Started in the feet; burning at night |
| Whole hand plus arm or face, one side | Brain or spinal cord | Sudden onset is an emergency; over days, consider MS |
| Whole arm, worse with the arms raised | Thoracic outlet, between collarbone and first rib | Heaviness and aching with overhead work |
The map is a guide rather than a rule. Territories overlap a little from person to person, and more than one problem can be true at once: diabetic neuropathy also makes carpal tunnel syndrome more likely, which is a common reason people are told conflicting things.
Numbness in fingers and fingertips
Numbness in the fingers rather than the whole hand is the most common version, and the fingertips usually go first, because the nerve fibers that reach them are the longest. Pins and needles, tingling, and numbness are points on the same scale and point to the same causes. Finger by finger, the usual sources are these:
| What is numb | Where the problem usually is |
|---|---|
| Thumb or index finger | The median nerve at the wrist (carpal tunnel). With neck or shoulder-blade pain, a nerve root in the neck (C6) |
| Middle finger | The median nerve at the wrist, or a nerve root in the neck (C7) when pain runs down the back of the arm |
| Ring and little fingers | The ulnar nerve at the elbow. Numbness that also runs up the inner forearm points to a nerve root in the neck (C8) instead |
| Fingertips on both hands | Peripheral neuropathy when the feet went first; carpal tunnel in both wrists when the little fingers are spared |
| One finger only | A small branch of a nerve pressed by a tight ring, a tool handle, or a knock |
Numbness that skips the little finger points to the wrist, and the carpal tunnel page covers that pattern in detail; this page covers the rest.
The pattern is a useful clue
- Thumb side: Symptoms can point toward a nerve problem at the wrist.
- Little-finger side: Symptoms can point toward a nerve problem near the elbow.
- Arm and neck: The wider symptom pattern also helps locate the cause.
Numbness in one hand or both hands
Numbness in the left hand or the right hand
The side itself rarely names the cause. Carpal tunnel syndrome tends to start in the dominant hand, and an ulnar nerve problem usually follows the elbow you lean on. What matters is the pattern within the hand and what brings it on.
One exception matters more than any nerve pattern. Numbness in the left arm or hand together with chest pressure, shortness of breath, sweating or nausea can be a heart attack: call 911 or go to an emergency department.
Numbness in both hands
Carpal tunnel syndrome is often present in both wrists, so both hands numb at night with the little fingers spared is still usually the wrists. New numbness in both hands with the feet also affected, or spreading over months, points to a whole-body cause: peripheral neuropathy from diabetes, a vitamin B12 deficiency, or thyroid disease. Both hands with neck pain or clumsy walking can mean pressure on the spinal cord in the neck.
Sudden numbness in one hand
Numbness that arrives in seconds to minutes is its own category. The whole hand with the arm or face on the same side, or with weakness, is an emergency (below). Numbness that spreads slowly through the fingers, hand, and face over ten to twenty minutes with a headache after is usually a migraine aura. Numbness you woke with that cleared within minutes of moving was pressure from sleep position. Numbness that builds over a few days, in a patch or down one side, and lingers for weeks is a different pattern again: it can be one of the early signs of MS.
Numb hands at night or when you wake up
Numb fingers that wake you once in a while are just the way you slept. When the same fingers wake you up numb night after night, a nerve is usually already squeezed, and your sleeping position squeezes it harder.
- Thumb, index and middle fingers. Most people sleep with their wrists curled. A bent wrist raises the pressure inside the carpal tunnel and presses on the median nerve, which is why carpal tunnel syndrome so often shows up at night first, and why shaking the hand out brings the feeling back.
- Little and ring fingers. Sleeping with the elbows tightly bent, hands tucked under the pillow or the chin, stretches and presses the ulnar nerve at the elbow.
- Both hands, every morning. This is still most often carpal tunnel in both wrists. But when both hands wake up numb most mornings, especially if your feet tingle or burn too, it is time to check your blood sugar. Diabetes makes nerves more vulnerable to pressure and can cause a neuropathy of its own. Thyroid function and vitamin B12 are usually checked in the same blood draw.
A night splint that keeps the wrist straight is the usual first step, with the other changes listed under treatment below. Numbness that no longer clears after you wake, or now comes in the daytime too, is the point to have it examined.
What causes hand numbness
- Nerve compression, by far the biggest group: the median nerve at the wrist, the ulnar nerve at the elbow, less often the radial nerve.
- Neck problems, a herniated disc or arthritis pinching a root, which usually adds neck or shoulder-blade pain.
- Peripheral neuropathy, most often from diabetes, which reaches the hands only after the feet.
- Vitamin B12 deficiency, which damages nerves and sometimes the spinal cord, and is easy to test and to treat.
- Thyroid disease, which both causes numbness and makes nerves more vulnerable to compression.
- Migraine aura, numbness that spreads through the hand and face over minutes, usually before a headache.
- Reduced blood flow, as in Raynaud's phenomenon, where the fingers also change color in the cold.
- Injury to the hand, wrist, or arm.
Numbness from sleeping on an arm or holding one position clears within minutes and needs nothing. Numbness that recurs, wakes you, lasts hours, or comes with weakness should be looked at.
When to call 911
Sudden numbness in a hand together with weakness on one side, a drooping face, slurred speech, confusion, vision loss, or a severe headache can be a stroke. Stroke treatment is time-critical, so this is an emergency call rather than an appointment.
How the cause is found
The examination does most of the work. Mapping where sensation is reduced, checking whether the small hand muscles are weak or thinned, and seeing whether tapping the wrist or bending the elbow reproduces the symptoms usually localizes the problem within minutes. Twitching in a muscle that is still strong is a different and usually harmless thing; see muscle twitching in the hand or arm.
Testing is then used to confirm, not to search:
- Nerve conduction studies and EMG, small electrical pulses along the nerve and a fine needle in the muscle, show which nerve is affected, where it is pressed, and how badly. Worth doing when surgery is being considered, when the picture is mixed, or when there is weakness.
- MRI of the neck when the pattern and examination point to a nerve root.
- Blood tests for diabetes, thyroid function, and vitamin B12.
- Nerve ultrasound, used at some centers to see swelling at a compression site.
Locating the affected nerve
- Distribution: The affected fingers and arm areas guide localization.
- Examination: Strength, sensation, and reflexes add information.
- Tests: Nerve studies or imaging are selected when needed.
Hand numbness treatment, and what to try at home
Treatment follows the cause, and most causes start conservatively. That is why the cause comes first: a wrist splint does nothing for a nerve root in the neck, and neck therapy does nothing for a B12 deficiency.
| If the cause is | First steps | Reasons to escalate |
|---|---|---|
| Carpal tunnel | Night splint, changing the provoking activity | Constant numbness, weak or thinning thumb muscle |
| Ulnar nerve at the elbow | Stop leaning on the elbow, night splint keeping it straight | Weakness, wasting between the fingers |
| Nerve root in the neck | Physical therapy, posture changes, nerve-pain medication | Weakness, or no change after several weeks of therapy |
| Peripheral neuropathy | Treat the underlying cause, plus symptom relief; the cause decides whether it can be reversed | Rapid spread, weakness, or unsteadiness |
| B12 deficiency or thyroid disease | Replace the vitamin, treat the thyroid | Numbness persisting once levels are normal |
Escalation usually means a corticosteroid injection around the nerve, or surgery to release it. Carpal tunnel release and ulnar nerve decompression generally give good results, and we refer to a hand or spine surgeon when that is the right step. Products sold as nerve supplements have not been shown to relieve numbness from a compressed nerve.
What you can try at home works on pressure, so it helps most when the nerve is squeezed at the wrist or the elbow:
- Keep the wrist straight at night. A wrist splint holds it straight while you sleep, which is when the pressure on the nerve peaks.
- Stop leaning on the elbow, on a desk, an armrest or the car door, and try not to sleep with the elbows tightly bent.
- Take breaks from a bent-wrist grip, such as holding a phone, a steering wheel or a tool for long stretches.
If these changes have not helped within a few weeks, or the numbness has become constant, the cause needs an examination rather than more of the same.
When to see a neurologist
See one if the numbness keeps returning, wakes you at night, has lasted more than a few weeks, or comes with weakness or clumsiness. Compressed nerves recover well when treated early and less completely once muscle has been lost.
Dr. Achillefs Ntranos, MD sees these patients in Beverly Hills and at our Los Angeles office. A first visit is 60 minutes, most of it the history and the examination described above. We do not perform nerve conduction studies or EMG in our office; when they are needed we arrange them nearby and review the results with you. A video visit is a reasonable way to start, though numb hands usually need a hands-on examination, and we will say so. If numbness keeps waking you, request a visit in person or by video anywhere in California; no referral is needed, and the office confirms within 1 business day. Follow-ups are usually every one to three months and last 30 minutes, and messages between visits are answered within 1 business day.
Frequently asked questions
References
- Cleveland Clinic. Numbness in hands: causes and treatment.
- National Institute of Neurological Disorders and Stroke. Carpal tunnel syndrome.
- National Institute of Neurological Disorders and Stroke. Peripheral neuropathy.
- American Academy of Orthopaedic Surgeons, OrthoInfo. Carpal tunnel syndrome.
- American Stroke Association. Stroke symptoms.