Migraine Aura — Symptoms, Duration and When to Worry
The shimmering, the tingling, the words that won't come — explained by a Sydney neurologist, with clear guidance on when an aura needs urgent attention.
Book a ConsultationWhat Is a Migraine Aura?
If you have had a migraine aura, you probably remember your first one clearly: a shimmering zigzag that grew across your vision, a blind spot where a face should have been, or a tingling that crept from your fingers up your arm. For many people the first thought is stroke. For the great majority it is not. A migraine aura is a wave of temporarily altered activity moving slowly across the surface of the brain. It builds over minutes, lasts less than an hour, and leaves no damage behind.
About one in four people with migraine experience aura at some point — migraine with aura, once called "classic migraine". The aura usually comes before the headache, but it can overlap with it, or occur with no headache at all.
The science: aura is thought to be caused by cortical spreading depression — a slow wave of nerve-cell excitation, followed by quietening, that travels across the brain's surface at roughly 3 millimetres a minute. That speed is why aura symptoms "march": the shimmer expands across the visual field over 15–30 minutes, or tingling travels from the hand to the face over the same time. The wave is self-limiting and fully reversible.
Where most people sit
A typical aura — gradual onset, spreading over minutes, fully resolving within 60 minutes, followed by a familiar headache — is one of the most recognisable patterns in neurology, and it does not injure the brain. Most people with aura have a handful of attacks a year and need no treatment for the aura itself. It is the recurring, stereotyped, fully reversible pattern that separates aura from the things people fear — stroke, a transient ischaemic attack, or a growth in the brain — none of which produce the same slow, spreading, fully reversible march.
Migraine Aura Symptoms — the Types of Aura
Aura can affect vision, sensation, speech and — rarely — strength and balance. The symptoms often arrive in sequence, vision first, each lasting 5–60 minutes.
| Type | What it feels like | How common |
|---|---|---|
| Visual aura | A shimmering, flickering blind spot (a scintillating scotoma) that starts near the centre of vision and expands outwards, often edged by zigzag "fortification" lines; flashing lights; blurred or heat-haze vision. It is on the same side in both eyes — close one eye and it is still there — because it comes from the brain, not the eye. | About 9 in 10 auras |
| Sensory aura | Tingling or pins-and-needles that starts in the fingers of one hand and spreads slowly up the arm to the face, lips and tongue over 10–20 minutes, sometimes leaving numbness behind for a while. | Common, usually with visual aura |
| Speech or language aura | Trouble finding words, jumbled words or slurred speech — brief, and frightening at the time. | Less common |
| Brainstem aura | Vertigo, double vision, ringing in the ears, unsteadiness or slurred speech, usually with visual aura. | Uncommon — needs specialist assessment |
| Hemiplegic migraine | True weakness of one side of the body as part of the aura; often runs in families. | Rare — needs neurological assessment |
| Retinal migraine | Visual loss or flashing in one eye only. | Rare — needs assessment to exclude eye and vascular causes |
"Ocular migraine" is a loose term people use for visual aura; it is not a diagnosis. If your visual symptoms affect one eye only, say so at your appointment — that changes the assessment.
Migraine Aura Without Headache (Silent Migraine)
Aura can occur with no headache at all — typical aura without headache, often called "silent" or "acephalgic" migraine. It becomes more common as people get older: someone who had classic migraine with headache in their twenties may, in their fifties or sixties, get the visual aura alone. It is diagnosed on the pattern — the gradual build, the spread, the full recovery within an hour — and on having no other explanation.
The one important caveat: when aura first appears after about 50, or an established pattern changes, it needs assessment to make sure it is not a transient ischaemic attack (TIA) — a brief interruption of blood supply to part of the brain that can look similar but comes on suddenly rather than spreading.
Where most people sit
That assessment is usually straightforward. The distinguishing features in the next sections settle it in the consulting room far more often than not; a scan is arranged when the story is atypical, not routinely. For most people the diagnosis remains migraine.
How Long Does a Migraine Aura Last?
- Each symptom lasts 5–60 minutes. A visual aura typically lasts 20–30 minutes.
- It builds gradually — over at least 5 minutes — rather than appearing all at once.
- Symptoms come in sequence. If vision, then sensation, then speech are all affected, the whole episode can run longer than an hour, but each individual symptom stays within the hour.
- The headache, if it comes, starts within 60 minutes of the aura ending — or overlaps with it.
- Aura lasting more than an hour ("prolonged aura") is uncommon. It occasionally happens in people with a long history of aura, but a new prolonged aura should be assessed.
- Frequency ranges from once in a lifetime to several times a month. Frequent aura is a reason to discuss preventive treatment.
Is It a Stroke? When Migraine Aura Is an Emergency
Aura and stroke can share symptoms — visual loss, numbness, trouble speaking — but they behave differently. The behaviour is what matters.
| Feature | Migraine aura | Stroke or TIA |
|---|---|---|
| Onset | Builds gradually over 5–20 minutes | Sudden — at its worst within seconds |
| Nature | "Positive" — shimmering, zigzags, tingling that spreads | "Negative" — loss: blank vision, numbness, weakness, lost speech |
| Progression | Marches from one symptom to the next | All symptoms together from the start |
| Duration | Each symptom under 60 minutes, full recovery | May persist — do not wait to find out |
| Pattern | Like your previous attacks | New or different, especially after 50 |
Call 000 — or go to an emergency department — if
- symptoms come on suddenly and all at once
- there is weakness or drooping of the face, an arm or a leg
- speech is suddenly slurred or lost
- the aura lasts more than an hour
- it is your first-ever aura, especially over 50, or during pregnancy or the weeks after childbirth
- it comes with a "thunderclap" headache — the worst of your life, peaking within a minute — or with fever, a stiff neck or confusion
A first aura is worth urgent assessment even if it resolves — treat it as new until it has been checked. Remember FAST: Face drooping, Arm weakness, Speech difficulty, Time to call 000.
Where most people sit
In someone with an established pattern of aura, an episode that looks like all the previous ones is almost never a stroke. What we are looking for is the episode that is different.
Migraine Aura, Stroke Risk and the Pill
Migraine with aura carries a small increase in the long-term risk of ischaemic stroke — roughly double the risk of someone without migraine. The baseline risk in a young person is low, so the absolute risk remains small. Two things multiply it: smoking, and oestrogen-containing (combined) hormonal contraception — the combined pill and the vaginal ring.
For that reason Australian and international guidelines advise against the combined pill in women who have migraine with aura, at any age. Progestogen-only methods — the mini-pill, the implant and the hormonal IUD — do not carry this concern and are generally suitable. The choice is one to make with your GP or gynaecologist, and we are happy to write to them. Menopausal hormone therapy is a separate question with a different risk profile; discuss it individually.
What actually lowers the risk
Not smoking, and keeping blood pressure, cholesterol and weight in check, do more for someone with aura than any treatment of the aura itself. If you have migraine with aura and take the combined pill, do not stop it abruptly without cover — book a review and switch methods with your GP.
How to Prevent Migraine With Aura
Preventing aura means preventing migraine. Nothing stops an aura once it has started — the wave passes on its own — so the strategy is fewer attacks overall.
- Regularity. Regular sleep, regular meals and enough fluid remove the most common triggers. Alcohol, sleep loss and the "let-down" after a stressful period are frequent culprits; bright or flickering light and long screen sessions trigger some people.
- Acute treatment, timed right. Simple pain relief (paracetamol, an anti-inflammatory) can be taken as soon as the aura begins. Triptans do not shorten the aura and work best at the start of the headache phase, so they are usually taken once the headache begins. Triptans are avoided in hemiplegic and brainstem aura. An anti-nausea tablet helps if nausea is part of your attacks.
- Preventive medication when attacks are frequent or disabling. The options are those used for migraine generally: daily oral preventives; the CGRP monoclonal antibodies — Emgality, Ajovy and Vyepti are PBS-listed for eligible patients, and Aimovig is available privately; and Botox for chronic migraine under its PBS criteria. Some preventives appear to reduce the frequency of aura specifically; which one suits you is a consultation decision.
- Keep a diary. Timing, triggers, aura type and duration turn a vague story into a diagnosis and a plan — use our headache diary.
When to See a Neurologist About Migraine Aura
- Your first-ever aura (after urgent care, if any of the emergency features applied)
- Aura that has changed in type, length or frequency
- Aura lasting more than 60 minutes, or any weakness with aura
- Aura without headache appearing after about 50
- Frequent or disabling attacks
- You take the combined pill, or are planning a pregnancy
- You want a clear diagnosis and a plan
A consultation involves a detailed history, a neurological examination and — when the story is atypical — an MRI. Most people leave with a diagnosis, reassurance and a treatment plan. Dr Ron Granot trained at Prince of Wales Hospital, Sydney's leading headache and neurology training centre, and sees patients in Bondi Junction. For the wider picture, read our migraine overview.
Frequently Asked Questions
Worried About Your Aura?
Book a consultation with Dr Ron Granot — headache specialist neurologist in Bondi Junction. Ask your GP for a referral, then get in touch.
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