Numbness and Tingling in Hands and Feet: Causes and When to See a Doctor
You wake up at night with a numb arm. Your toes go numb while walking. Pins and needles run up your whole hand. Numbness and tingling are symptoms most people have experienced at least once. Sometimes it's just a case of "sleeping on your arm." But sometimes it's a signal of a problem with the nerves, spine, blood vessels, or metabolism. Here's how to tell the difference.
Numb Hands: Carpal Tunnel, Neck, Blood Vessels
Hand numbness is one of the most common neurological symptoms. The cause is almost always nerve related: either the nerve is compressed somewhere along its path, or its blood supply is impaired.
Carpal tunnel syndrome — the most common cause of hand numbness. The median nerve passes through a narrow tunnel in the wrist. When compressed, the thumb, index finger, middle finger, and half the ring finger go numb. Symptoms worsen at night and with repetitive hand use (typing, driving). Common in people who do a lot of manual work, pregnant women, and people with diabetes or hypothyroidism.
Cervical disc herniation — compression of a nerve root in the cervical spine. Numbness travels from the neck down the arm to the fingers. The area affected depends on the level: C6 — thumb and index finger; C7 — middle finger; C8 — ring finger and little finger. Accompanied by neck pain.
Thoracic outlet syndrome — compression of nerves and blood vessels between the collarbone and first rib. Numbness of the entire arm, worsening when raising the arm overhead.
Raynaud's phenomenon — vascular spasm in the fingers triggered by cold. Fingers turn white, then blue, then red. Uncomfortable but usually not dangerous.
Cubital tunnel syndrome — compression of the ulnar nerve at the elbow. The little finger and ring finger go numb; worsens when the elbow is bent.
Numb Feet and Legs: Spine, Diabetes, Varicose Veins
Leg numbness is most commonly related to the lumbar spine, peripheral nerves, or blood vessels.
Lumbar disc herniation and sciatica — the most common cause of leg numbness. A herniated disc compresses a nerve root that supplies the leg. Numbness runs from the lower back down the back or side of the leg to the foot. Accompanied by pain (sciatica). The affected area depends on the level: L4 — inner shin; L5 — top of the foot and big toe; S1 — heel and little toe.
Diabetic neuropathy — damage to peripheral nerves from diabetes. Numbness and tingling are symmetrical, starting in the feet ("socks" pattern), then moving upward ("stockings" pattern). Burning sensation, especially at night, is characteristic. This is a complication of diabetes that develops with prolonged poor blood sugar control.
Varicose veins and chronic venous insufficiency — impaired venous return leads to swelling and numbness, especially by evening. Heaviness and pressure in the legs.
Spinal stenosis — narrowing of the spinal canal. Numbness and weakness in the legs during walking that resolves when sitting (neurogenic claudication). Typical in older adults.
Tarsal tunnel syndrome — the foot's equivalent of carpal tunnel syndrome. Compression of the tibial nerve at the ankle; numbness in the sole of the foot.
Numbness on One Side of the Body — A Red Flag
Numbness affecting one entire side of the body — face, arm, and leg on the same side — is a neurological red flag. This pattern points to a central nervous system problem: the brain or spinal cord.
Stroke or transient ischemic attack (TIA): sudden numbness on one side of the body, especially combined with:
- Weakness in the arm or leg on one side
- Speech difficulties (slurred speech, trouble finding words)
- Facial asymmetry (drooping corner of the mouth)
- Vision disturbance (double vision, loss of visual field)
- Sudden severe headache with no obvious cause
This is an emergency. Call emergency services immediately. In stroke, every minute counts: "time is brain." Thrombolysis (clot-dissolving treatment) is only effective within the first 4.5 hours.
Multiple sclerosis (MS) — an autoimmune condition in which the myelin sheath of nerves is damaged. Numbness can be one of the first symptoms, especially in young adults. Usually asymmetrical, may affect the face, arm, or leg.
Tingling and Burning: Neurology or Vitamin Deficiency
Tingling ("pins and needles"), burning, and "electric shock" sensations are signs of nerve irritation or damage.
Vitamin B12 deficiency — one of the most common and underrecognized causes of tingling and numbness. B12 is essential for myelin synthesis — the protective sheath around nerves. Without it, nerves become "exposed" and start misfiring. Symptoms: tingling in the hands and feet, balance problems, weakness, cognitive issues. High-risk groups: vegetarians and vegans, older adults, people with stomach conditions, and those taking metformin.
Vitamin B6 — excess (supplement overdose) also causes neuropathy.
Alcoholic neuropathy — chronic alcohol use damages peripheral nerves. Burning and numbness in the feet and lower legs.
Hypothyroidism — an underactive thyroid slows metabolism and can cause tunnel syndromes and neuropathy.
Anxiety and hyperventilation — rapid shallow breathing lowers CO₂ in the blood, causing vascular spasm and tingling in the hands, feet, and around the mouth.
If numbness and tingling bother you regularly, Symptomatica can help you work through your symptoms and understand which specialist to see.
When Numbness Requires Urgent Care
Call emergency services or go to the emergency room immediately for:
- Sudden numbness on one side of the body (face + arm + leg on the same side) — stroke
- Numbness with speech difficulty, weakness, or vision changes — stroke
- Numbness after a spinal injury — possible spinal cord damage
- Numbness with loss of bladder or bowel control — cauda equina syndrome (compression of nerves in the lower spine), requires emergency surgery
- Progressive weakness in the arms or legs combined with numbness
Frequently Asked Questions
My hand goes numb at night — is this carpal tunnel syndrome?
Nighttime hand numbness is a classic symptom of carpal tunnel syndrome. During sleep, the wrist bends, increasing pressure on the nerve. If the thumb, index finger, and middle finger go numb — carpal tunnel is highly likely. If the entire arm goes numb or numbness runs from the neck — cervical disc disease is more probable. A nerve conduction study (NCS/EMG) is the test used to confirm the diagnosis.
What is a nerve conduction study (EMG/NCS) and why is it ordered?
A nerve conduction study (NCS) and electromyography (EMG) measure the speed of electrical impulses along nerves and the electrical activity of muscles. This allows precise identification of which nerve is affected, at what level, and how severely. Ordered for numbness, tingling, limb weakness, and suspected carpal tunnel syndrome, neuropathy, or radiculopathy.
Is it normal for my toes to go numb while walking?
No, this is not normal. Toe numbness during walking can be a sign of spinal stenosis (neurogenic claudication), impaired leg circulation (intermittent claudication from arterial atherosclerosis), or diabetic neuropathy. A neurologist or vascular surgeon should be consulted.
How do I tell stroke-related numbness from a "dead arm" from sleeping on it?
"Sleeping on your arm" — numbness develops after prolonged pressure on the arm, resolves within a few minutes of changing position, and is symmetrical. Stroke numbness — sudden, without an obvious cause, only on one side of the body, does not resolve quickly, and is often accompanied by other symptoms (weakness, speech difficulty). When in doubt — call emergency services.
Tingling and numbness from anxiety — is it real or "all in my head"?
It's real. Anxiety and panic attacks often trigger hyperventilation — breathing too fast and shallowly. This lowers CO₂ in the blood, causing vascular spasm and tingling in the hands, feet, and around the mouth. The symptom is unpleasant but not dangerous. It resolves when breathing normalizes. Slow, deep breathing or breathing into a paper bag can help.
Symptomatica is an informational reference service. Not a medical service; does not diagnose or prescribe treatment. For any symptoms, please consult a doctor.