Seek Emergency CareNew unilateral face/arm/leg numbness, especially with weakness, speech problems, or vision change: call 999/911. This pattern suggests stroke until proven otherwise.

Distribution → Diagnosis

Pattern	Likely Cause
One hand/forearm (median nerve)	Carpal tunnel syndrome
Ulnar nerve territory (little/ring finger)	Cubital tunnel syndrome
'Glove and stocking' (hands and feet symmetrically)	Peripheral polyneuropathy (diabetes, B12, alcohol)
One side of face + arm + leg	Stroke / TIA: emergency
Saddle area (groin, inner thighs)	Cauda equina: emergency
Both legs + bladder/bowel dysfunction	Spinal cord compression: emergency
Unilateral face + arm, comes and goes	Multiple sclerosis relapse / TIA

Carpal Tunnel TestPhalen's test: hold wrists in forced flexion for 60 seconds. Tingling in median nerve distribution (thumb, index, middle finger) strongly suggests carpal tunnel. Confirm with nerve conduction studies.

What causes persistent tingling in both feet?

The most common causes are diabetic neuropathy, vitamin B12 deficiency, alcohol-related neuropathy, and idiopathic small-fibre neuropathy. A blood test panel (HbA1c, B12, folate, TFTs) should be the first investigation.

Is tingling a sign of MS?

Sensory symptoms, tingling, numbness, or 'electric shock' sensations, are among the most common MS symptoms. They typically affect patches of skin rather than following a nerve distribution, and may come and go.

Why do I wake up with numb hands?

Carpal tunnel syndrome characteristically causes nocturnal tingling and numbness in the thumb, index, and middle fingers: waking you from sleep. Resting the wrist in a neutral splint at night usually provides significant relief.

Can anxiety cause numbness and tingling?

Yes. Hyperventilation in anxiety reduces CO₂, causing perioral tingling, tingling in fingers, and muscle cramps. Controlled breathing usually resolves symptoms rapidly.

Why the pattern matters more than the sensation

Numbness and tingling feel much the same wherever they come from, so the diagnosis rests almost entirely on distribution. Symptoms confined to the thumb, index and middle fingers suggest median nerve compression at the wrist. The little finger and half the ring finger suggest the ulnar nerve at the elbow. A band of numbness over the outer thigh suggests a compressed sensory nerve at the groin. Symptoms following a stripe down the arm or leg suggest a nerve root in the neck or lower back. Symmetrical numbness starting in both feet and creeping upwards over months is the classic pattern of a length-dependent peripheral neuropathy.

Causes worth excluding with blood tests

Diabetes and prediabetes, by some distance the commonest cause of symmetrical foot numbness.
Vitamin B12 deficiency, which can cause numbness with a sore tongue and unsteadiness, and which is worth checking in anyone on long-term metformin or a proton pump inhibitor.
Thyroid underactivity, which both causes neuropathy and predisposes to carpal tunnel syndrome.
Kidney and liver disease, and excess alcohol, all of which affect peripheral nerves.
Vitamin B6 excess, an under-recognised cause: high-dose supplements can themselves produce a sensory neuropathy.

When numbness is an emergency

Sudden numbness affecting one side of the body, or affecting the face and limb together, should be treated as a possible stroke and needs emergency assessment without delay. So does numbness around the genitals or inner thighs, particularly with difficulty passing urine, new incontinence or leg weakness, which can indicate cauda equina compression and is a surgical emergency where hours matter. Rapidly ascending numbness and weakness over days, especially after an infection, also needs urgent assessment.

Everyday measures that help

For carpal tunnel symptoms, a neutral wrist splint worn at night is often more effective than daytime measures, because most people sleep with the wrist flexed. For ulnar symptoms, avoiding prolonged elbow flexion and leaning on the elbow helps. For diabetic neuropathy, glucose control slows progression but rarely reverses established damage, which is why daily foot inspection and properly fitted footwear matter: numb feet lose the warning system that normally prevents ulcers.

Numbness & Tingling: What the Pattern Tells Your Doctor