Neurological Symptoms: Headache, Dizziness, and Numbness Explained
A sudden severe headache, numbness in your arm that won't go away, dizziness that makes it hard to walk — neurological symptoms are common but cause very different levels of concern. Some you can sleep off. Others require an ambulance within minutes. Here's how to tell the difference.
Headache: when to take a painkiller and when to call an ambulance
Most headaches are tension headaches or migraines. Unpleasant, sometimes intensely so, but not life-threatening. A painkiller and rest are usually enough.
But some headache features should not be ignored. Remember these:
- Thunderclap headache — the worst headache of your life, striking suddenly like a blow. This is the classic symptom of subarachnoid haemorrhage. Call an ambulance immediately.
- Headache with fever and neck stiffness (unable to touch your chin to your chest) — a sign of meningitis. Call an ambulance immediately.
- Headache with vision changes, speech problems, or limb weakness — possible stroke. Call an ambulance immediately.
- Headache after a head injury, especially if there was loss of consciousness — requires urgent assessment.
- A new, worsening headache in an older adult who hasn't had headaches before — needs evaluation.
A typical tension headache is bilateral, pressing, not very severe, triggered by fatigue, stress, or long hours on a screen. Migraine is usually one-sided, throbbing, severe, with nausea and sensitivity to light and sound. Both are treatable, but frequent migraines warrant a neurology consultation.
Dizziness: what it might mean
Dizziness isn't always about the head. Dozens of causes can produce it, from simple hunger to serious neurological problems.
Vertigo (true dizziness) — a sensation that everything is spinning around you, or you are spinning. Most commonly related to the ear: benign paroxysmal positional vertigo (BPPV), Meniere's disease, vestibular neuritis. Unpleasant, but usually treatable.
Pre-syncope — feeling like you're about to faint, vision going dark, weakness. Causes include a drop in blood pressure upon standing, dehydration, low blood sugar, or arrhythmia.
Dizziness combined with other symptoms — a dangerous combination:
- dizziness + double vision + limb weakness — possible stroke;
- dizziness + hearing loss + ringing in the ears — Meniere's disease;
- dizziness + chest pain or heart palpitations — cardiac cause.
Numbness and tingling in hands and feet
A hand that's fallen asleep from an awkward position and returns to normal in a few minutes is physiology, not a symptom. But if numbness appears for no clear reason, persists, or returns regularly — see a doctor.
Common causes of hand and foot numbness:
- Carpal tunnel syndrome — numbness and tingling in the hand, especially at night. Common in people who work with their hands or use a computer extensively.
- Herniated disc — numbness running down the arm or leg along a specific path.
- Diabetic neuropathy — symmetrical numbness and tingling in the feet.
- Vitamin B12 deficiency — numbness in limbs, weakness, balance problems.
Emergency situation: sudden numbness on one side of the body (face, arm, leg) is one of the hallmark signs of a stroke. Call an ambulance immediately.
Weakness and coordination problems
Fatigue and weakness are different things. Fatigue resolves with rest. Neurological weakness is a loss of muscle strength — when an arm or leg doesn't respond the way it used to.
Coordination problems — an unsteady gait, missing the target with precise movements, feeling that your legs "don't obey." This can be a symptom of cerebellar damage, multiple sclerosis, or peripheral neuropathy.
Both situations require a neurology consultation. If weakness develops suddenly, especially on one side — stroke. Call an ambulance immediately.
Signs of a stroke: the FAST test in plain language
A stroke is a disruption in blood supply to the brain. Every minute counts: the earlier the treatment, the less damage. Remember the FAST test:
- F — Face. Ask the person to smile. If one corner of the mouth droops — warning sign.
- A — Arms. Ask them to raise both arms. If one drifts down or can't be raised — warning sign.
- S — Speech. Ask them to say their name and address. Slurred speech, strange words, no speech — warning sign.
- T — Time. If any one of these signs is present — call emergency services immediately.
A stroke can also present with: sudden vision loss (especially in one eye), sudden severe headache, sudden loss of balance or coordination.
Which doctor to see
For chronic headaches, dizziness, or numbness without emergency signs — start with a GP. They'll rule out non-neurological causes and refer you to a neurologist. Go directly to a neurologist if:
- symptoms recur regularly;
- you've already been diagnosed (migraine, neuropathy);
- you need an MRI or electromyography.
For acute symptoms — one-sided numbness, speech problems, sudden severe pain — call an ambulance without delay. Don't wait to see if it passes on its own.
Not sure how urgent it is? Describe your symptoms to the assistant — it will assess the situation and suggest the next step.
Frequently asked questions
How do I tell a migraine from a regular headache?
Migraine is usually more intense, often one-sided, and comes with nausea, sensitivity to light and sound. It can be preceded by an "aura" — visual flashes or temporary vision changes. An attack lasts 4 to 72 hours. A tension headache is dull, pressing, bilateral, and passes more quickly and easily.
What should I do when I feel very dizzy?
Lie down or sit, and fix your gaze on a still object. Avoid sudden movements. If dizziness is accompanied by limb weakness, speech or vision changes — call an ambulance. If you know you have BPPV, the Epley manoeuvre can help (best performed with a physiotherapist or neurologist the first time).
Why is my left arm numb?
The left arm can go numb for many reasons: an awkward position, carpal tunnel syndrome, cervical spine problems. But if the numbness came on suddenly, especially with chest pain or shortness of breath — this could be a heart attack. Call an ambulance immediately.
Do I need an MRI for a headache?
Not for every headache. An MRI is ordered when there is suspicion of an organic cause: a tumour, vascular problem, or signs of inflammation. For typical migraine or tension headache, an MRI is usually not needed. A neurologist makes this decision after examination.
When is arm numbness a sign of stroke?
If numbness came on suddenly, involves one side of the body (arm, leg, face simultaneously), and is accompanied by weakness, speech or vision changes — these are stroke signs. Call an ambulance immediately. Even if symptoms resolve within minutes (TIA, transient ischaemic attack) — urgent evaluation is needed within the next few hours.
Neurologist or GP — who should I see first?
For a first visit with unclear symptoms — your GP. They'll order a blood count, check blood pressure and thyroid, and refer you to a neurologist if needed. If you've already been evaluated and have a neurological diagnosis, go directly to a neurologist.
Symptomatica is an informational reference service. Not a medical service; does not diagnose or prescribe treatment. For any symptoms, please consult a doctor.