Medically reviewed guide · Last updated: 1 September 2026 · Reading time: approx. 10 min

Numb Hands: Why Your Fingers Go Numb at Night — Carpal Tunnel and Other Causes

The most common causes compared

The causes in detail

This article is about one very specific pattern: hands and fingers that have "gone to sleep" at night or on waking. Tingling with no link to position or time of day is covered in the article on tingling in the hands and feet, and persistent reduced sensation in the article on numbness. The condition itself, with all the treatment details, is described in the article on carpal tunnel syndrome.

Pressure during sleep: the harmless kind of going to sleep

A nerve needs a good blood supply to pass on signals properly. If it is under pressure — your arm under the pillow, your hand under your body, your wrists sharply bent as in the "foetal position" with your fists under your chin — conduction stalls. You feel numbness first, then the familiar pins and needles once the pressure is relieved. That is unpleasant, but as a rule it has no after-effects, as long as it disappears completely after a few minutes and does not happen every night.

A special form is Saturday night palsy (also known as park bench palsy): after very deep sleep — often after alcohol or sleeping pills — the arm has lain over an edge for hours, and the radial nerve in the upper arm has been compressed. The hand then hangs limply and cannot be lifted (wrist drop). This usually recovers over weeks, but it should be seen by a doctor.

Carpal tunnel syndrome: the most common reason for numbness at night

In the carpal tunnel, a narrow channel on the palm side of the wrist, the median nerve (nervus medianus) and nine flexor tendons run beneath a tight ligament. If space becomes tight there, the nerve comes under pressure. Typical is numbness at night in the thumb, index and middle fingers and the thumb-side half of the ring finger; the little finger is spared because it is supplied by a different nerve. Many people wake up with tingling or burning pain that can extend into the forearm, and shake the hand out until it gets better.

Later, symptoms appear during the day as well, for instance when holding a phone or a steering wheel; then fine motor skills and strength can decline and the ball of the thumb can become flatter. The syndrome is encouraged by anything that narrows the tunnel further: pregnancy (afterwards it often improves by itself), diabetes, an underactive thyroid, inflammatory rheumatic joint disease, being overweight, and frequent forceful bending movements or vibration at work. If pain in the wrist itself is the main issue, the article on wrist pain will help you make sense of it.

Ulnar nerve: when the ring and little fingers go to sleep

The ulnar nerve (nervus ulnaris) runs along the inside of the elbow in a bony groove just beneath the skin — the spot that gives an "electric" pain when you knock it. If the elbow is bent sharply for a long time, the nerve is stretched and compressed. People who sleep with their arms bent, spend a long time on the phone or lean on their elbows a lot then feel tingling in the ring and little fingers. If the irritation persists, the small muscles of the hand can become weaker. Less often the narrowing is at the wrist, for example in cyclists who put a lot of pressure on the handlebars.

Cervical spine: when the nerve is already irritated in the neck

The nerves for the arm and hand leave the spinal cord between the cervical vertebrae. A slipped disc or wear-related narrowing can irritate a nerve root there. Then usually only one hand and a particular area of the fingers are affected, often together with pain that radiates from the neck into the shoulder and arm and gets worse with certain head movements. Because the root for the thumb and index finger can mimic carpal tunnel syndrome, the cervical spine is part of the assessment when findings are unclear. If both hands become clumsy and your walking becomes unsteady, the spinal cord itself may be narrowed — a reason for a prompt examination.

Polyneuropathy: when both sides are affected

In polyneuropathy many nerves are damaged at the same time, and the longest ones first. That is why it usually starts in the feet, with the hands following only later — symmetrically, in a "stocking and glove" pattern. Typical are burning, tingling and a feeling as if wrapped in cotton wool, which becomes more noticeable at rest and at night. Among the most common causes are diabetes and alcohol, along with vitamin B12 deficiency, reduced kidney function, thyroid disease and medicines. Unlike position-related numbness, the feeling does not go away when you shake your hand out.

Circulation, breathing, brain: rare, but important

In Raynaud's syndrome, the small arteries in the fingers go into spasm with cold or stress. The fingers turn white first, then bluish, then red as they warm up again — and numb in the meantime. This depends on temperature, not on your sleeping position; more on this under cold hands and feet. Tingling in both hands and around the mouth during anxiety points to breathing too fast (hyperventilation). A stroke shows itself differently: suddenly, usually on one side of the body including the face, regardless of position and impossible to shake off.

Self-tests: first clues at home

These observations do not replace a diagnosis — individual tests can also come out positive in healthy people and negative in people who are affected. Taken together, though, they point you in a good direction.

• The finger map: next time, mark which fingers are numb. Thumb to middle finger (little finger spared) fits the median nerve, the ring and little fingers the ulnar nerve, and the thumb side of the back of the hand the radial nerve. All fingers of both hands affected equally is more consistent with polyneuropathy.
• The shake test: does it get much better when you shake your hand out or let it hang loosely? This observation is typical of carpal tunnel syndrome.
• The flexion test (Phalen's test): put the backs of your hands together in front of your chest so that both wrists are bent at a right angle, and hold this for up to one minute. Tingling in the thumb to middle finger is a sign of a narrow carpal tunnel.
• The tapping test (Hoffmann-Tinel sign): using two fingers of your other hand, tap the centre of the palm side of your wrist. An electric sensation shooting into the fingers suggests an irritated nerve at that point.
• The elbow test: bend your arm as far as it will go and hold it for about a minute. If the ring and little fingers go to sleep, the ulnar nerve is more likely to be involved.
• The strength check: do up buttons, pick up a coin, compare the balls of both thumbs. If one side is clearly flatter or weaker, it is no longer a case for waiting.
• The two-week log: note down the nights, your position, alcohol or sleeping pills and any new medicines. The pattern often says more than any single test.

Warning signs: when not to wait

• Sudden numbness or weakness of a hand or arm, especially together with changes to the face, speech or vision — even if it passes again after minutes
• Numbness that rises from the feet within days and makes the legs and hands weak
• Both hands clumsy and numb, together with unsteady walking or problems with the bladder or bowel
• A dropped hand, increasing weakness of grip or a visibly flattening ball of the thumb
• Numbness after a fall, an accident or under a freshly applied cast, especially with severe swelling and pain
• Arm symptoms together with chest tightness, shortness of breath or a cold sweat

The treatment pathway: step by step

Without warning signs, the assessment usually moves from the simple to the more elaborate.

1. Check your position. For two weeks, sleep deliberately with straight wrists and relaxed elbows. If the symptoms disappear, it was very probably pressure alone.
2. Try a night splint. If carpal tunnel syndrome is suspected, a wrist splint keeps the joint in a neutral position at night. According to the guideline, this is a sensible first step for mild to moderate symptoms.
3. Basic tests at the GP practice. An examination of strength, sensation and reflexes, plus — depending on the findings — blood sugar, thyroid level, vitamin B12, kidney values and blood count, and a look at your complete medication list.
4. Neurological measurement. Electroneurography (measuring nerve conduction velocity), often supplemented by nerve ultrasound, shows which nerve is affected, where and how severely.
5. Targeted treatment. In carpal tunnel syndrome, a cortisone injection can relieve the symptoms for weeks to months; for the ulnar nerve, avoiding pressure and bending helps first, and for the cervical spine, physiotherapy.
6. Surgery if necessary. With marked findings, muscle wasting, or when conservative measures are not enough, the carpal tunnel is widened in a procedure that is usually done as an outpatient. Whether and when to operate is always decided by the practice treating you, together with you.

The medication angle: when treatment gets on your nerves

Some active substances damage nerves directly, others encourage a nutrient deficiency or a narrowing, and still others prevent you from changing position at night.

Active substances that can damage nerves

The best known are chemotherapy drugs such as platinum compounds, taxanes, vincristine or bortezomib: numbness and tingling in the hands and feet are among their typical side effects. Report new symptoms early to your oncology team — the treatment can be adjusted there. Among antibiotics, the fluoroquinolones such as ciprofloxacin deserve a mention; the BfArM (German Federal Institute for Drugs and Medical Devices) has warned that they can cause long-lasting, possibly permanent side effects, including nerve damage. With longer use, metronidazole and nitrofurantoin can also damage nerves, as can colchicine (especially with reduced kidney function), amiodarone and the tuberculosis medicine isoniazid.

Metformin and your vitamin B12 stores

Metformin can reduce the absorption of vitamin B12 when taken for many years. A marked deficiency can trigger polyneuropathy or make diabetic nerve damage worse. The summary of product characteristics therefore recommends checking the B12 level if there are risk factors or nerve symptoms. Stomach acid blockers taken over many years can also impair B12 absorption somewhat. Stopping metformin on your own initiative, on the other hand, is no solution — the deficiency can be corrected in a targeted way.

Topiramate and aromatase inhibitors: known patterns

The migraine and epilepsy medicine topiramate very commonly causes tingling in the fingers, the toes and around the mouth, usually without nerve damage and often fading over time; you must not stop it abruptly. Aromatase inhibitors such as anastrozole or letrozole, which are taken for years after breast cancer, list carpal tunnel syndrome as a side effect in their summaries of product characteristics. In both cases the rule is: raise it rather than stop taking it.

Sleeping pills, sedatives and alcohol

In normal sleep you change position again and again before a nerve comes to any harm. Active substances that sedate deeply — such as zolpidem, benzodiazepines, sedating antihistamines or opioids — and alcohol in particular suppress this protective reflex. The risk of pressure damage then rises, up to and including Saturday night palsy.

Too much of a good thing: vitamin B6

Vitamin B products are a popular buy for numb fingers. Yet vitamin B6, of all things, can itself cause nerve damage with tingling and numbness when taken in high doses over a long period. So check how much B6 your supplements contain, and add them to your medication plan — more on this in the guide Supplements and medications.

Painkillers: limited benefit, limited duration

In carpal tunnel syndrome, over-the-counter painkillers such as ibuprofen help little. Without medical advice, the package leaflet usually says: no longer than three to four days in a row. For nerve pain caused by polyneuropathy, the practice uses other active substances, such as pregabalin, gabapentin, duloxetine or amitriptyline. The painkiller comparison gives an overview. Which treatment is right for you is always decided by the practice treating you.

How to prevent numb hands

• Wrists straight, elbows relaxed — do not sleep on your hands, with your arms under the pillow or with your elbows sharply bent. A night splint holds the position even in deep sleep.
• Take breaks from manual work — when typing for long periods or using vibrating tools, loosen up regularly, do not keep your wrists bent all the time and do not lean on your elbows.
• Keep underlying conditions well controlled — well-controlled blood sugar and a treated underactive thyroid protect the nerves and take pressure off the carpal tunnel.
• Go easy on alcohol and sleeping pills — both suppress the change of position during sleep. If you need sleeping pills, discuss how long to take them with your practice.
• Keep your medication list up to date — including vitamin products. With long-term treatment with metformin or acid blockers, the practice can keep an eye on your B12 level.

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