Almost everyone has experienced tingling, pins and needles, or numbness in their hands or feet—for instance when an arm has 'fallen asleep'. This is usually harmless and disappears quickly. However, if such abnormal sensations persist, recur repeatedly, or spread, it is worth having them investigated: they may be caused by irritation or damage to nerves, less commonly by circulatory or metabolic causes. The location of the tingling and how it develops often points the way to the underlying cause.
Possible causes
Pressure on a nerve (compression)
Very common: A nerve becomes trapped at a narrow point, for example at the wrist in carpal tunnel syndrome or at the elbow. Typical symptoms are tingling and numbness in specific fingers, often at night or with certain postures.
Irritation of a nerve root
If a disc or wear and tear at the spine presses on a nerve root, tingling or numbness radiates into the arm or leg, usually along a specific strip of skin.
Polyneuropathy
Damage to many small nerves, typically beginning symmetrically in both feet and slowly progressing upwards. Common underlying causes are long-standing elevated blood sugar or deficiency of certain vitamins.
Circulation and deficiency states
Reduced circulation or a deficiency such as vitamin B12 can also cause abnormal sensations. Such causes can be investigated well and are often readily treatable.
Typical steps at the doctor's office
- 1The neurologist will ask detailed questions about where the tingling is located, how long it has been present, whether it affects one or both sides, and what influences it. She will then examine sensation, strength, reflexes, and circulation—this already narrows down the possible causes considerably.
- 2Depending on the suspected diagnosis, targeted investigations follow: measurement of nerve conduction velocity if a compression site or polyneuropathy is suspected, blood tests to look for metabolic or deficiency causes, and imaging of the spine if needed.
- 3Treatment is directed at the underlying cause: relief and targeted measures for nerve compression, correction of a deficiency, control of elevated blood sugar. The aim is to address the cause before the nerve sustains permanent damage.
What you can do yourself
- Pay attention to postures that compress a nerve—such as leaning on your elbows or sharply bent wrists at night—and avoid them where possible.
- If you experience tingling in your hand at night, it may help to keep your wrist straight and to interrupt one-sided strain during the day.
- Exercise regularly—this promotes circulation and supports nerve health.
- Pay attention to a balanced diet; if you have diabetes, good blood sugar control is the most effective way to protect your nerves.
A doctor's visit is advisable if the tingling or numbness persists for a longer period, keeps recurring, spreads, or is accompanied by loss of strength. Abnormal sensations on both feet that slowly progress upwards should also be investigated without urgency, so that the cause can be treated early.
Frequently asked questions
- Why does tingling occur mainly at night in the hands?
- Nocturnal tingling in specific fingers is typical of nerve compression at the wrist, carpal tunnel syndrome. During sleep, the wrists are often bent, which irritates the nerve further. A neurological examination provides clarity.
- Is tingling a sign of stroke?
- Usually not, if it develops slowly and without other symptoms. However, if numbness appears suddenly, affects an entire half of the body, or is accompanied by speech, vision, or gait disturbance, rapid action is needed.
- Will it go away on its own?
- Brief tingling from an awkward posture, yes. Persistent or recurring abnormal sensations, however, should be investigated, because depending on the cause, the nerve can be protected better the earlier action is taken.
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