Quick answer. Numbness and tingling are often caused by a trapped or compressed nerve such as carpal tunnel syndrome, or by conditions like diabetes or vitamin B12 deficiency. But sudden numbness or weakness on one side of the body, with face drooping or slurred speech, may be a stroke – call 995 immediately.
Numbness and tingling (“pins and needles”) are common sensations that can affect the hands, feet, face or other parts of the body. Most causes are not dangerous, such as a temporarily compressed nerve.
This guide explains the common causes, the stroke warning signs that need emergency care, and which specialist to see.
At a glance
| Cause | What it suggests | Urgency |
|---|---|---|
| Trapped nerve (e.g. carpal tunnel) | Tingling or numbness in the hand or fingers, often worse at night | See a doctor soon |
| Diabetes (peripheral neuropathy) | Gradual numbness or burning in the feet or hands | See a doctor soon |
| Vitamin B12 deficiency | Tingling in hands and feet, sometimes with tiredness or balance problems | See a doctor |
| Pinched nerve in the neck or back | Numbness radiating down an arm or leg, often with neck or back pain | See a doctor soon |
| Stroke | Sudden numbness/weakness on one side, face droop, speech trouble | Emergency – call 995 |
Stroke warning signs (call 995 now)
Call 995 immediately if numbness or tingling comes on suddenly, especially with any of the following signs of a stroke. Use F.A.S.T.:
- F – Face: sudden drooping or numbness on one side of the face
- A – Arm: sudden weakness or numbness in an arm (or leg), usually on one side
- S – Speech: slurred speech or trouble speaking or understanding
- T – Time: if you see any of these signs, call 995 immediately
A stroke is a medical emergency – early treatment saves lives and reduces disability. Do not wait to see if symptoms pass. Other warning signs include sudden confusion, severe headache, loss of balance or sudden vision problems.
Common causes of numbness and tingling
A very common cause is a trapped or compressed nerve. Carpal tunnel syndrome, where a nerve is squeezed at the wrist, causes tingling and numbness in the hand and fingers, often worse at night. A pinched nerve in the neck or lower back can cause numbness that travels down an arm or leg, frequently with associated pain.
These symptoms can also be temporary – for example, from sitting or sleeping in one position – and ease once pressure on the nerve is relieved.
Medical causes to be aware of
Persistent or widespread numbness and tingling can be due to underlying medical conditions. Diabetes is a leading cause of peripheral neuropathy, typically causing numbness or burning in the feet and hands. Vitamin B12 deficiency can also cause tingling, sometimes with fatigue or balance problems. Less commonly, nerve and neurological conditions can be responsible. Blood tests and nerve studies often help identify the cause.
When to see a doctor (non-emergency)
See a doctor if numbness or tingling is persistent, spreading, getting worse, affecting both sides, interfering with daily activities, or occurring in someone with diabetes. Numbness with weakness, loss of bladder or bowel control, or following a significant injury should be assessed urgently. Any sudden, one-sided numbness or weakness should be treated as a possible stroke – call 995.
Which specialist should you see?
For persistent or unexplained numbness and tingling, a neurologist (a specialist in conditions of the nerves, brain and spinal cord) can assess your symptoms and arrange tests such as nerve conduction studies. You can browse neurologists to find a doctor in Singapore. Remember that sudden one-sided numbness or weakness with face droop or speech trouble is an emergency – call 995 immediately.
How to prepare for your appointment
Before seeing the doctor, jot down when the numbness or tingling started, where it is felt, whether it comes and goes or is constant, and anything that makes it better or worse, such as a particular hand position or sitting for long periods. Note any associated weakness, pain, neck or back symptoms, or changes in balance, vision or bladder control. List your medical conditions, especially diabetes, and your current medicines and supplements. If symptoms are episodic, a short note of each episode helps the doctor see the pattern.
What to expect at the appointment
The doctor will examine the affected area, test sensation, strength and reflexes, and check whether the pattern fits a single trapped nerve or a more widespread process. Blood tests are common to look for diabetes, vitamin B12 deficiency, thyroid problems and other causes. If a trapped or compressed nerve is suspected, you may be referred for nerve conduction studies, and a neurologist may arrange imaging of the neck or back where relevant. Sudden one-sided numbness is always assessed urgently to rule out stroke.
Self-management at home
For everyday pins and needles from pressure on a nerve, simple steps often help: change position regularly, avoid leaning on your elbows or bending the wrists for long periods, and take breaks from repetitive tasks. A neutral wrist splint at night can ease carpal tunnel symptoms. If you have diabetes, good blood sugar control and daily foot care, checking for cuts or pressure areas you may not feel, help protect the nerves. Do not ignore numbness that is spreading, worsening or affecting both sides.
Special situations
In pregnancy, fluid retention can compress nerves at the wrist and cause carpal tunnel symptoms that often settle after delivery. Older adults are more prone to nerve problems from diabetes, spinal changes and vitamin deficiencies, and may also be at higher stroke risk, so sudden symptoms should never be dismissed as ageing. Anyone with diabetes who notices new foot numbness should be reviewed, as reduced sensation raises the risk of unnoticed injury.
Common questions
Are pins and needles always serious?
No. Brief tingling from sitting or sleeping in one position usually eases quickly. Persistent, spreading or one-sided symptoms, or any with weakness, need assessment.
Can vitamin B12 deficiency really cause tingling?
Yes. Low B12 can cause tingling in the hands and feet, sometimes with tiredness or balance problems, and is checked with a simple blood test.
What is the single most important warning sign?
Sudden numbness or weakness on one side of the body, face drooping or slurred speech. Treat this as a stroke and call 995 immediately.
Related guides
- Best Neurology Clinics in Singapore — our editorial shortlist
- neurology clinics directory
- Ear pain
- Neck lump
- Blurred vision
Sources
- HealthHub – Reduce your risk of stroke and act F.A.S.T.
- SingHealth – Stroke
- NHS – Pins and needles
- Mayo Clinic – Numbness
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