Brain & nerves

Migraine Aura Symptoms: What They Are and What Causes Them

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Migraine aura refers to neurological symptoms — most often visual — that occur before or during a migraine. The most common form is a moving arc of zigzag lines that expands over 20–30 minutes. Aura is caused by a slow electrical wave in the brain and is not dangerous in itself, though new or changing visual symptoms should be evaluated to rule out other causes.

Last updated: July 2026History

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What exactly is migraine aura?

Aura is a set of reversible neurological symptoms that arise from a phenomenon called cortical spreading depression — a slow wave of suppressed electrical activity that spreads across the brain's cortex. This wave briefly disrupts normal function in whichever brain region it passes through, producing temporary sensory, visual, or speech symptoms.

About one-third of people who have migraines experience aura at least some of the time. Aura can occur with or without a subsequent headache — a pattern called migraine aura without headache (sometimes called a silent migraine). This is more common in older adults and can be confusing because there is no pain to label the event 12.

What are the most common aura symptoms?

Visual aura is by far the most common type and often includes:

  • A scintillating scotoma: a shimmering crescent or arc of zigzag lines, often with a blind spot (scotoma) in the center, that expands slowly over 20 to 30 minutes and then moves to the edge of vision and fades
  • Bright flashing lights or sparkles at the periphery of vision
  • A temporary blind spot that drifts across the visual field
  • Tunnel vision or blurred patches

Sensory aura follows visual aura in frequency and causes:

- Tingling or numbness that travels slowly along one hand, up the arm, and sometimes to the face — typically over 20 to 30 minutes

Language aura: difficulty finding words or understanding speech, lasting minutes

Motor aura: weakness on one side of the body — rare and specifically associated with hemiplegic migraine, a distinct and more complex subtype

Most aura symptoms develop gradually over 5 to 20 minutes and last less than 60 minutes. Sudden-onset neurological symptoms or those lasting more than 60 minutes are not typical of aura and need urgent evaluation 12.

What causes the zigzag lights?

The zigzag pattern (scintillating scotoma) is caused by the cortical spreading depression wave moving across the visual cortex at the back of the brain. As the wave advances, it excites and then suppresses neurons in successive areas of the visual cortex, producing the characteristic moving arc. The gradual expansion and resolution over 20 to 30 minutes directly reflects the slow progression of this wave across the cortex.

This is a well-established neurological mechanism, not a blood vessel spasm or a vision problem. The eyes themselves are normal during a visual aura — the phenomenon is entirely in the brain's visual processing.

How long does migraine aura last?

Each individual aura symptom typically lasts 5 to 60 minutes. If more than one type of aura occurs in sequence (e.g., visual followed by sensory), the total aura period can be up to 60 minutes. The headache, if it follows, usually begins within an hour of the aura ending.

Aura symptoms that:

  • Appear suddenly rather than building gradually
  • Last more than 60 minutes
  • Involve weakness rather than just tingling
  • Occur for the first time in someone over 40 who has never had aura before

...should be evaluated promptly, as these features can also accompany a TIA (transient ischemic attack) or stroke 2.

How do I know it is aura and not something serious?

The typical zigzag arc that expands slowly over 20 to 30 minutes and then resolves completely — especially in someone with a known migraine history — is reassuring. Aura symptoms are gradual in onset, orderly in progression, and fully reversible.

Red flags that suggest this is not typical aura:

  • Sudden onset visual loss or neurological symptoms (aura builds; strokes begin abruptly)
  • Symptoms affecting only one eye rather than one side of the visual field (could indicate a retinal problem, not cortical aura)
  • Persistent symptoms — true aura resolves completely within an hour
  • New aura in someone who has never had it before, over age 40 — warrants evaluation to rule out a TIA
  • Double vision, loss of balance, or severe vertigo — may point to the brainstem rather than migraine

If you are uncertain whether what you experienced was aura, it is reasonable to contact a clinician. If symptoms are still present and you are worried, seek urgent care 2.

Does having aura affect migraine treatment?

For acute treatment, most medications effective for migraine without aura are also effective for migraine with aura. Triptans can be used, though timing relative to aura onset may affect response. Taking a triptan during the aura phase versus at headache onset shows variable results across individuals.

Preventive therapy for migraine with aura follows similar principles as for migraine without aura. However, there is one important health consideration: migraine with aura is associated with a modestly increased risk of ischemic stroke, particularly in women who also smoke or use combined oral contraceptives (estrogen-containing). A clinician should know if you have migraine with aura when prescribing hormonal contraception 23.

Common questions

Yes. Migraine aura without headache — sometimes called a silent migraine — is recognized and occurs more commonly as people age. Visual aura that resolves completely and is brief is usually benign, but new episodes of this type in people over 40 who have not had them before should be evaluated.

In the context of a known migraine pattern, a slowly expanding arc of zigzag lines that resolves within 30 minutes is not dangerous in itself. It reflects a well-understood electrical wave in the brain. If you have never had it before or it looks different from usual, a clinician should evaluate it.

True cortical migraine aura affects one side of the visual field in both eyes — not just one eye. If covering one eye makes the visual disturbance disappear, the problem may be in that eye rather than in the brain, and you should see an ophthalmologist or go to an emergency department promptly.

This is something to discuss with your clinician. Estrogen-containing contraceptives are generally not recommended for people who have migraine with aura due to a modestly elevated stroke risk. Progestin-only options are typically preferred. A Gale clinician can help you review your contraceptive options.

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When visual or neurological symptoms need urgent evaluation

  • —Sudden-onset vision loss in one eye — not the same as typical aura, may be a retinal or vascular event
  • —Neurological symptoms that do not completely resolve within 60 minutes
  • —First-ever aura-like symptoms in a person over 40 with no prior migraine history
  • —Aura followed by severe headache in someone with no prior migraine history
  • —Weakness, difficulty speaking, or facial drooping alongside visual changes

Sudden neurological symptoms — especially vision loss in one eye, facial drooping, arm weakness, or speech difficulty — may indicate a stroke or TIA. Call 911 immediately. Do not wait to see if symptoms resolve.

This article provides general health education and is not a substitute for clinical evaluation. If you are unsure whether your visual symptoms are typical migraine aura, contact a Gale clinician or seek urgent care.

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References

  1. 1.National Library of Medicine (2025). Migraine. MedlinePlus, National Library of Medicine. link ✓Description of migraine aura types, duration, and the distinction between aura with and without headache
  2. 2.Ailani J, Burch RC, Robbins MS; Board of Directors of the American Headache Society (2021). The American Headache Society Consensus Statement: Update on integrating new migraine treatments into clinical practice. Headache. doi:10.1111/head.14153 ✓Migraine with aura treatment considerations, stroke risk association, and contraceptive guidance
  3. 3.Charles AC, Digre KB, Goadsby PJ, Robbins MS, Hershey A; American Headache Society (2024). Calcitonin gene-related peptide-targeting therapies are a first-line option for the prevention of migraine: An American Headache Society position statement update. Headache. doi:10.1111/head.14692 ✓Context for preventive treatment of migraine with aura

3 sources, numbered by first appearance. General health information, not medical advice. AI-assisted editorial content — every citation independently verified. Editorial policy

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