Numbness in your legs or feet is a signal, not a disease in itself. Sometimes it comes from sitting badly for too long, sometimes from a nerve compressed in your lower back — and occasionally it is the first sign of a problem that physiotherapy alone cannot fix. This guide walks you through where the numbness can come from, when to worry, and what can actually be done about it.
What numbness actually is
What we casually call numbness — the “dead leg” feeling, pins and needles, tingling, or skin that feels like cardboard — is medically called paresthesia. It appears when the signal between the nerves of the leg and the brain is disturbed somewhere along the route: at the spine, along the nerve itself, or in the foot. Where you feel it often matters less than the path it follows and the situations that trigger it — which is why a proper assessment beats any internet search.
The common causes, in plain language
1. Mechanical causes — what we see most often in clinic
- Lumbar disc herniation and nerve-root compression — a bulging or herniated disc presses on a nerve root, and the numbness travels a clear route: buttock → thigh → calf → foot, usually on one side only.
- Sciatica — irritation of the sciatic nerve; the numbness usually comes with pain pulling down the back of the leg.
- Lumbar spinal stenosis — typical over 55–60: heaviness and numbness in both legs when walking, easing when you sit down or lean forward.
- Piriformis syndrome — a tight buttock muscle compresses the sciatic nerve; common in drivers and desk workers.
- Local compressions — tarsal tunnel syndrome at the ankle, Morton’s neuroma between the toes, tight footwear, or a cast worn too tight.
2. Circulation problems
- Peripheral artery disease — narrowed arteries starve muscles and nerves of blood; the classic pattern is cramp or numbness while walking that eases when you stop.
- Venous insufficiency and swelling — swollen legs can compress surrounding structures and feel numb and heavy by evening.
3. Metabolic and general causes
- Diabetes — diabetic neuropathy typically starts symmetrically, in a “sock” pattern on both feet, and progresses slowly.
- Vitamin B12 deficiency, long-term alcohol use, and some medicines (chemotherapy agents, certain antibiotics) can all damage peripheral nerves.
- Thyroid problems and other endocrine or rheumatological conditions.
The practical rule we use at assessment: numbness on one side, along a clear route, points to a mechanical cause (spine, compressed nerve) — physiotherapy territory. Symmetrical, both-feet, “sock-pattern” numbness points to a general cause and needs blood tests and a medical consult first.
Red flags — when to see a doctor straight away
Numbness is rarely an emergency, but a few combinations should not wait for a physiotherapy appointment. Go to an emergency department the same day if the numbness comes:
- suddenly, together with visible weakness — you cannot stand on your toes or heels, or your foot slaps or drags when walking;
- in the saddle area (groin and inner thighs), with bladder or bowel changes — possible cauda equina syndrome;
- together with numbness of the face or an arm, trouble speaking or seeing — possible stroke;
- after a significant injury to the spine or leg;
- in a leg that is also swollen, warm and painful — a clot must be ruled out first.
Finding the cause: the assessment
At the first visit we do not treat — we look for the source. The assessment takes about an hour and covers your full history (when the numbness appears, along which route, what eases it), mobility testing of the lumbar spine and hip, neurodynamic tests for the sciatic and femoral nerves, and strength and reflex testing. If the picture is not clearly mechanical, we refer you for investigations first (blood work, MRI, nerve studies) — physiotherapy applied to the wrong diagnosis is wasted time, and the first assessment with us is free precisely so that this triage costs you nothing.
What physiotherapy can do — and what it cannot
When the cause is mechanical — disc herniation, sciatica, stenosis, piriformis syndrome — physiotherapy is the first-line treatment recommended by international guidelines. A plan typically includes:
- manual therapy for the joints and tissues maintaining the compression;
- nerve mobilisation exercises (neurodynamics) — nerves glide through tissue, and that glide can be trained;
- progressive exercise therapy for the trunk and hip, so the load on the disc and nerve root drops for good;
- position and load education — how you sit, lift and pace your desk time, so progress is not undone between sessions.
Just as important is what we do not treat: diabetic neuropathy, B12 deficiency or artery disease will not improve with exercise — our job there is to recognise them at assessment and send you to the right specialist. You can read more on our dedicated page about numbness in the legs or about leg pain.
What you can do at home, starting today
- Break up sitting every 30–45 minutes — two minutes standing changes the pressure on your discs and sciatic nerve.
- Check your footwear — narrow toe boxes and high heels compress the nerves of the foot directly.
- Gentle daily movement — flat-ground walking is the safest “medicine” for circulation and nerves.
- Don’t sleep on the sofa with a leg hanging off, and avoid long periods of crossed legs.
- Keep a short log — when it appears, how long it lasts, what triggers it. It shortens the assessment and sharpens the diagnosis.
Frequently asked questions
Why do my feet go numb at night?
Most often it is positional — a nerve sits compressed under your body weight. But if night-time numbness keeps returning, affects both feet, or wakes you from sleep, get it checked: peripheral neuropathy and lumbar stenosis often produce night symptoms.
Does sciatica numbness go away on its own?
The pain of sciatica often settles within weeks, but numbness means the nerve root is compressed — and prolonged compression recovers more slowly. The earlier the nerve is decompressed and retrained, the better the odds of full recovery.
How many physiotherapy sessions will I need?
It depends on the cause and how long you have had symptoms. As a guide, a typical programme with us runs 10–15 sessions with reassessment along the way. After the first assessment you get a concrete plan with an estimated number of sessions and measurable goals — not an open-ended subscription.
Do I need a referral?
No — you can book directly; we work privately, outside the state insurance system. If the assessment finds signs that need a medical consult or imaging first, we tell you openly and point you in the right direction before starting any programme. Contact us here.
This guide is for information only and does not replace a medical consultation. If you have any of the red flags described above, seek medical care immediately.