The aura is a warning phase that comes before some migraines

An aura is a set of visual, sensory, or motor symptoms that can happen 20 to 60 minutes before a migraine headache starts. Not everyone who gets migraines experiences an aura — roughly one in three people with migraines do. When an aura does occur, it follows a predictable pattern: symptoms build gradually, peak, and then fade as the headache pain begins.

The aura itself is not dangerous, but it serves as an early signal that a migraine is coming. This advance warning can give you time to take medication, find a quiet space, or adjust your plans before the headache hits.

Key Takeaways

  • An aura is a cluster of symptoms — usually visual disturbances like flashing lights or blind spots — that appears 20 to 60 minutes before migraine pain starts.
  • Common aura symptoms include zigzag lines, shimmering lights, partial vision loss, tingling, numbness, or difficulty speaking, and they typically last 20 to 30 minutes.
  • Having an aura does not mean your migraine will be worse than someone else's, but it does give you advance notice to take preventive steps.
  • If you experience new aura symptoms, sudden changes in your aura pattern, or aura without a headache following, tell your doctor at your next appointment.

What aura symptoms look and feel like

Visual symptoms are the most common type of aura. You might see flashing lights (sometimes called photopsia), zigzag lines that shimmer and expand across your field of vision, or a blind spot that grows larger. Some people describe it as looking through a kaleidoscope or seeing heat waves. These disturbances usually start small and spread outward over several minutes.

Sensory auras affect touch and feeling. Tingling or numbness often starts in one hand, spreads up the arm, and may reach the face or tongue. Motor auras are less common but can include temporary weakness on one side of the body. A small number of people experience speech difficulties or trouble finding words during an aura.

Aura symptoms are temporary and reversible — they always go away on their own. The entire aura phase typically lasts 20 to 30 minutes, though it can be as short as 5 minutes or as long as an hour.

Why the aura happens

Doctors believe an aura occurs because of a wave of electrical activity that spreads across the brain's surface. This wave causes blood vessels to constrict (narrow) and then dilate (widen), and it triggers the release of chemicals that irritate nerve endings. The visual symptoms correspond to which part of the brain the wave passes through — if it crosses the visual cortex at the back of the brain, you see flashing lights or blind spots.

This electrical wave is separate from the migraine headache itself, which develops through a different mechanism involving inflammation and nerve sensitivity. The aura and the headache are connected but distinct events in the migraine process.

The difference between aura with migraine and aura without headache

Most people who have an aura experience it followed by a migraine headache — this is called migraine with aura. However, some people have aura symptoms that resolve without any headache pain following. This pattern is called aura without migraine or silent migraine.

Aura without headache is less common but not unusual. If you suddenly start having aura symptoms without a headache, or if your usual pattern changes, mention it to your doctor. While aura without headache is generally not a cause for concern, your doctor may want to rule out other conditions that can produce similar symptoms.

When to contact your doctor about aura

If you have had the same aura pattern for years and it remains unchanged, you do not need to report it at every visit. However, contact your doctor if you notice any of these changes: aura symptoms that are new or different from your usual pattern, aura that lasts much longer than it normally does, aura that occurs without a headache following (if that is new for you), or aura accompanied by weakness, difficulty speaking, or loss of consciousness.

These changes could indicate something other than migraine and warrant evaluation. Your doctor may perform an exam or imaging to rule out stroke or other neurological conditions, especially if the aura is sudden and unlike anything you have experienced before.

How to prepare when you feel an aura starting

The 20 to 60 minutes of aura time is your window to act before the headache pain arrives. As soon as you recognize the early signs, take your migraine medication if your doctor has prescribed one — taking it during the aura phase often prevents or reduces the headache that follows. Some people find that medication works better when taken early rather than waiting for pain to develop.

Move to a quiet, dark space if you can. Dim the lights or close your eyes, because visual auras can make bright light uncomfortable. If you are at work or driving, pull over or let someone know what is happening. Drink water and avoid triggers like strong smells or loud noise. Some people find that lying down or resting helps, while others prefer to stay upright and active — learn what works best for you through trial and experience.

Aura and stroke risk

People with migraine with aura have a slightly higher risk of stroke than people without migraine, but the absolute risk remains low. The increased risk is small enough that most people with aura do not need special preventive treatment for stroke beyond standard health measures like not smoking, managing blood pressure, and staying physically active.

If you have migraine with aura and you also smoke, your doctor may recommend quitting, because smoking combined with migraine aura raises stroke risk more than either factor alone. Hormonal birth control can also interact with aura migraine to increase stroke risk slightly — discuss this with your doctor if you use hormonal contraception and have aura migraines.

Frequently Asked Questions

Is an aura a sign of a serious problem?

An aura by itself is not dangerous, but it is a sign that a migraine is coming. If you have a new aura pattern, aura that lasts much longer than usual, or aura with weakness or speech problems, contact your doctor to rule out other conditions.

Can I prevent the aura from happening?

You cannot stop an aura once it starts, but migraine prevention medications may reduce how often auras occur. If your auras are frequent or severe, ask your doctor about preventive options.

Does having an aura mean my migraine will be worse?

Not necessarily. Some people with aura have mild headaches, while others have severe pain. The aura itself does not determine headache intensity — it just gives you advance warning.

What should I do if I am driving when an aura starts?

Pull over safely as soon as you can. Visual auras make it unsafe to drive, and the headache that follows will make it worse. Call someone for a ride or wait until your symptoms pass before continuing.

Can aura happen without a migraine headache?

Yes, some people experience aura symptoms that resolve without a headache following. If this is new for you, tell your doctor so they can confirm it is aura and not another condition.