A migraine with aura is a migraine attack preceded by temporary neurological symptoms, most commonly visual disturbances like flashing lights or zigzag lines, that typically last 5 to 60 minutes before the headache begins. About 15 to 20% of people who get migraines experience aura, and visual symptoms account for more than 90% of all aura episodes.
What Aura Looks and Feels Like
Aura symptoms fall into three broad categories: visual, sensory, and speech-related. Most people experience visual aura, but sensory and speech disturbances can occur on their own or alongside visual changes.
The most recognized visual aura is the scintillating scotoma, a flickering, shimmering pattern of zigzag lines that often starts as a small grey patch near the center of your vision. Over minutes, this patch expands outward, developing bright, jagged edges while leaving a temporary blind spot in its wake. A related pattern called fortification spectra produces complex zigzagging lines that are typically colorless but occasionally vivid. These visual disturbances are dynamic, not static. They shimmer, pulse, and migrate across your visual field, which distinguishes them from the fixed visual changes seen in other neurological conditions.
Beyond those classic patterns, people report a wide range of visual symptoms: foggy or blurred vision, bright flashes of light, small white dots sometimes described as “falling stars,” objects appearing larger or smaller than they are, and partial loss of vision on one side. A systematic review identified 30 distinct visual symptoms linked to migraine aura. Some people experience just one, while others get several in combination.
Sensory aura usually begins as tingling in one hand or arm, then slowly creeps upward over 10 to 20 minutes. The sensation can spread to one side of your face and tongue. It often accompanies visual aura or follows immediately after. Speech aura, called dysphasic aura, causes temporary difficulty finding words or forming sentences. This can be particularly alarming the first time it happens because it mimics stroke symptoms.
How Aura Symptoms Progress
Aura symptoms build gradually, which is one of their defining features. Each symptom spreads over at least five minutes and lasts between 5 and 60 minutes. When multiple types of aura occur, they tend to follow in sequence rather than appearing all at once. Visual changes come first, then sensory symptoms, then speech difficulty. The entire aura phase generally wraps up within an hour, though motor symptoms (weakness on one side of the body, seen in rarer subtypes) can persist for up to 72 hours.
The headache phase typically starts within 60 minutes of the aura ending, though some people experience a brief gap between the two. This gradual, sequential pattern is a key way to distinguish aura from more sudden neurological events like a stroke or transient ischemic attack, where symptoms tend to appear abruptly.
What Happens in the Brain During Aura
Aura is caused by a phenomenon called cortical spreading depression, a slow-moving wave of intense electrical activity that rolls across the surface of the brain. This wave essentially overloads a large population of brain cells for about a minute, then silences their normal electrical activity for several minutes afterward. It’s that combination of intense firing followed by shutdown that produces both the “positive” symptoms you see (flashing lights, zigzag lines) and the “negative” ones (blind spots, numbness).
The wave propagates slowly, which is why aura symptoms expand and shift over minutes rather than appearing instantly. When it moves across the visual processing area at the back of the brain, you get visual aura. When it reaches areas that process touch, you feel tingling. There is increasing evidence that this wave also triggers the pain mechanisms responsible for the headache that follows.
Aura Without a Headache
Some people experience all the neurological symptoms of aura but never develop a headache afterward. This is formally called “typical aura without headache,” previously known as acephalgic migraine. It occurs in roughly 3% of women and 1% of men who have migraines. The visual symptoms are identical to those in standard migraine with aura: bright, colorful, shimmering, and dynamic, with geometric shapes and jagged edges. Episodes typically last 15 to 30 minutes.
This condition can be tricky to diagnose because the absence of headache makes people less likely to connect it to migraine. It also needs to be carefully distinguished from transient ischemic attacks, especially in older adults experiencing it for the first time. The dynamic, shimmering quality of migraine aura and its gradual spread are the main features that set it apart from the more sudden, fixed visual loss of a vascular event.
Stroke Risk and Contraception
People with migraine with aura have roughly double the risk of ischemic stroke compared to people without migraines. The absolute risk remains low for most individuals, but this elevation has practical consequences, particularly for contraception choices.
The World Health Organization, the European Headache Federation, and both US and UK reproductive health authorities agree that combined hormonal contraceptives (the pill, patch, and vaginal ring containing estrogen) are contraindicated for women who experience migraine with aura. Estrogen-containing contraceptives can further increase an already elevated stroke risk. If you have migraine with aura, the recommended alternatives are non-hormonal methods like copper IUDs or condoms, or progestogen-only options like the mini-pill, hormonal IUD, implant, or injection. Women already using combined hormonal contraceptives should discuss switching once migraine with aura is identified.
Treating an Attack During Aura
The timing of treatment during a migraine with aura has been debated. Earlier studies found that triptans, the most commonly used class of migraine-specific medication, were ineffective when taken during the aura phase. However, more recent research has challenged that conclusion. In one study, treating with a triptan within the first 15 minutes of aura onset prevented the headache phase in 89% of attacks. That success rate was comparable to taking the same medication within the first hour of headache onset, where 79% of attacks were resolved within two hours. By contrast, waiting four hours after headache onset dropped effectiveness to just 21%.
This suggests the aura phase may actually represent a valuable early treatment window, though the evidence is still mixed. What’s consistent across studies is that earlier treatment produces better results. For people who recognize their aura pattern reliably, that recognition can serve as an early warning system to act quickly.
How It’s Diagnosed
A diagnosis of migraine with aura requires at least two attacks that meet a specific pattern. Aura symptoms must be fully reversible, with at least one symptom spreading gradually over five or more minutes. Individual symptoms should last between 5 and 60 minutes, and at least one should be one-sided. There is no blood test or brain scan that confirms migraine with aura. Diagnosis is based on your description of the episodes and their pattern over time. Imaging may be used to rule out other conditions, particularly if symptoms are atypical or appearing for the first time later in life.