Migraine aura is caused by a temporary wave of altered electrical activity spreading across the brain, which produces the visual and sensory disturbances that can precede or accompany a migraine. Aura can be unsettling, especially the first time, but it is a recognized and generally temporary part of migraine for the people who experience it. Understanding what aura is, what it feels like, and what is thought to cause it helps take some of the fear out of it.
This article is for general information and is not medical advice. New, sudden, or severe neurological symptoms should be checked by a healthcare professional promptly.
Key Takeaways
- Aura comes from a temporary wave of altered activity in the brain.
- It is most often visual but can be sensory or affect speech.
- Aura usually develops gradually and lasts up to an hour.
- Not everyone with migraine experiences aura.
- Sudden or new neurological symptoms need prompt medical attention.
What Aura Actually Is
Aura is a set of temporary neurological symptoms that can come before or alongside the headache phase of a migraine. It is understood to arise from a wave of changed electrical activity that spreads slowly across the surface of the brain, temporarily altering how the affected areas function. As this wave passes over the parts of the brain that handle vision, sensation, or speech, it produces the corresponding aura symptoms. Because the wave moves and then subsides, aura typically builds gradually and then resolves, rather than switching on and off abruptly. Migraine with aura covers the experience in depth.
Visual Aura
The most common form of aura is visual. People describe flickering or flashing lights, zigzag lines, shimmering or sparkling patches, and blind spots that drift across the field of vision. These visual disturbances often start small and expand or move over several minutes, reflecting the spreading wave in the visual part of the brain. The effect can be in one eye or across the vision, and it usually fades within an hour. Visual aura is temporary, but because it affects sight it can be particularly alarming, and it is wise not to drive or do anything requiring clear vision while it is happening. Ocular migraine covers vision-related migraine specifically.
Sensory and Speech Aura
Aura is not only visual. Some people experience sensory aura, felt as tingling or a pins-and-needles sensation that spreads slowly through a hand, arm, or one side of the face. Others have difficulty with speech or finding words during aura. Like visual aura, these symptoms typically develop gradually over minutes and then ease, mirroring the wave of activity moving through the relevant brain regions. Sensory and speech aura can be more disconcerting than visual aura because they resemble symptoms of other conditions, which is exactly why anything new or sudden should be checked rather than assumed to be aura. Aura without headache covers aura that occurs on its own.
What Can Bring Aura On
Aura tends to be part of a migraine attack, so the things that trigger migraines can be associated with attacks that include aura. Common migraine triggers such as stress, certain foods, hormonal changes, bright or flickering light, and sleep disruption can all be involved in setting off an attack. That said, the presence or absence of aura in a given attack is not fully predictable, and someone who usually gets aura may have attacks without it and vice versa. Identifying your personal triggers can help reduce attacks overall, which in turn reduces the aura that comes with them. Migraine triggers cover what to look for.
Why Some People Get Aura and Others Do Not
Not everyone with migraine experiences aura. Some people have migraine with aura, some have migraine without aura, and some have both at different times. Why the difference exists is not fully understood, and it appears to reflect individual differences in how a given person’s brain responds during an attack. Having aura is not necessarily a sign of a worse or more serious migraine; it is simply a different presentation. What matters more than whether you get aura is understanding your own pattern and managing your attacks, which a healthcare professional can help with. Migraine vs headache covers the broader distinctions.
When Aura Needs Medical Attention
While aura is a recognized part of migraine, new or unusual neurological symptoms should never simply be assumed to be aura. Aura that appears for the first time, that is different from your usual pattern, that lasts much longer than an hour, or that comes with weakness, confusion, or the worst headache of your life needs prompt medical attention, because symptoms that resemble aura can have other, more serious causes. If you have established migraine with aura, your healthcare professional can help you understand your normal pattern so you know what is typical for you and what warrants urgent care. When in doubt, seek help rather than wait. Finding a migraine specialist covers getting proper evaluation.
Living With Aura
For people who get aura regularly, learning their own pattern is genuinely useful. Many come to recognize their typical aura as an early warning that a headache phase may be coming, which gives them a chance to respond, whether that means stopping a demanding task, moving somewhere calm and dark, or following whatever plan they have worked out with their healthcare professional. Because aura can temporarily affect vision, sensation, or speech, it is also sensible to pause activities like driving until it passes. Knowing that typical aura is temporary and generally resolves within an hour can make it less frightening once you understand your own version of it. The key is distinguishing your familiar pattern from anything new or different, since the familiar is manageable while the unfamiliar warrants a check. That awareness turns aura from an alarming event into a signal you can work with. Responding to an attack covers acting on the warning.
Recommended Reading
Worth reading next: migraine with aura, aura without headache, ocular migraine, and migraine triggers.
The Bottom Line
Migraine aura comes from a temporary wave of altered electrical activity moving across the brain, producing visual, sensory, or speech symptoms that build gradually and usually fade within an hour. It is a recognized, generally temporary part of migraine for those who experience it, though not everyone with migraine gets aura. The most important practical point is the distinction between your familiar pattern, which is manageable once understood, and anything new, sudden, prolonged, or accompanied by weakness or confusion, which should be checked promptly because it can signal other causes. Understanding what aura is takes some of the fear out of it, and a healthcare professional can help you learn your own pattern so you know what is typical and what warrants urgent care.
What Causes Migraine Aura FAQ
What causes migraine aura?
Aura is understood to come from a temporary wave of altered electrical activity spreading across the brain. As it passes over areas handling vision, sensation, or speech, it produces the matching symptoms, then subsides. This is why aura builds gradually and usually resolves within an hour.
What does aura feel like?
Most often it is visual, with flickering lights, zigzag lines, shimmering patches, or blind spots drifting across vision. It can also be sensory, with tingling spreading through a hand or face, or affect speech. Symptoms usually develop over minutes and then fade.
How long does aura last?
Aura typically develops gradually and lasts up to about an hour before fading. It often precedes the headache phase but can occur alongside it or, for some people, on its own. Aura lasting much longer than an hour is a reason to seek medical attention.
Does everyone with migraine get aura?
No. Some people have migraine with aura, some without, and some have both at different times. Why the difference exists is not fully understood. Having aura is not necessarily a sign of a more serious migraine; it is simply a different presentation of the condition.
Can I prevent aura?
Since aura is part of an attack, reducing attacks by identifying and managing your triggers, such as stress, sleep disruption, and certain foods, can reduce the aura that comes with them. Whether a given attack includes aura is not fully predictable, but fewer attacks generally means less aura.
Is aura dangerous?
Typical aura in someone with established migraine with aura is generally not dangerous and resolves on its own. However, symptoms resembling aura can have other causes, so new, unusual, or prolonged neurological symptoms should be checked promptly rather than assumed to be aura.
When should aura prompt a doctor visit?
Seek prompt attention if aura appears for the first time, differs from your usual pattern, lasts much longer than an hour, or comes with weakness, confusion, or a sudden severe headache. These can signal other conditions. A professional can help you understand what is typical for you.
