A migraine with aura is a migraine attack that includes temporary neurological disturbances, most commonly visual, that develop before or during the headache phase. About a third of people with migraines experience aura. These disturbances are fully reversible, typically last between 5 and 60 minutes, and can include visual disruptions, tingling sensations, or difficulty speaking.
What Happens in Your Brain During Aura
Aura is caused by a phenomenon called cortical spreading depression: a slow wave of hyperactivity followed by a period of suppressed activity that moves across the surface of the brain. Think of it like a rolling blackout. As that wave passes through different areas of the brain, it temporarily disrupts whatever function that area controls. When it crosses the visual processing area, you get visual symptoms. When it crosses areas responsible for sensation or language, you get tingling or speech difficulties.
Researchers have long theorized this mechanism, and direct recordings of this brainwave flattening have now been captured during a live migraine attack, confirming what had been widely accepted but difficult to prove. Genetic mutations likely play a role in making certain people’s brains susceptible to these waves of disruption.
What Visual Aura Looks Like
Visual symptoms are by far the most common type of aura. The hallmark is a scintillating scotoma: a blind spot in your vision that’s covered by a shimmering, sparkling, or distorted effect. People describe it as looking through a kaleidoscope, or like the heat ripples you see rising off hot pavement. These visual disturbances typically start near the center of your vision and spread outward.
The patterns can take several forms. Fortification patterns appear as jagged, zigzagging lines, named because they resemble the notched top of a castle wall. Others see rings, arcs, or crescent-shaped distortions curving around their central vision. Flashing dots, flowing lights, and pulsing sparkles are also common. You can’t see through the affected area clearly, which is what distinguishes aura from simple light sensitivity.
These visual symptoms build gradually over at least 5 minutes rather than appearing all at once. That gradual onset is one of the key features that separates migraine aura from more alarming neurological events like stroke, where symptoms tend to hit suddenly.
Sensory, Speech, and Motor Symptoms
Not all aura is visual. Sensory aura produces tingling or numbness that often starts in the hand and gradually spreads up the arm and into the face. This “pins and needles” sensation is considered a positive symptom, meaning the brain is generating a sensation rather than blocking one. Like visual aura, it tends to march slowly from one area to the next rather than appearing everywhere at once.
Speech and language aura, called dysphasic aura, is less common but can be alarming. You may find yourself mumbling, slurring words, or unable to find the right word in conversation. Motor aura causes weakness on one side of the body and can last significantly longer than other aura types, up to 72 hours in some cases. When multiple aura symptoms occur, they usually happen in succession rather than all at the same time, and the total acceptable duration extends accordingly.
The Full Timeline of an Attack
A migraine with aura follows a predictable sequence. The prodrome phase can begin up to 24 hours before the aura, bringing irritability, fatigue, or depressed mood. These early warning signs are easy to miss or attribute to a bad day.
The aura phase itself typically lasts 5 to 60 minutes, though in about 20% of people it extends beyond an hour. The headache usually follows within 60 minutes of the aura starting, but the relationship isn’t always so clean. Sometimes aura and headache overlap. Sometimes the aura starts after the headache is already underway. And in some cases, the headache never comes at all.
After the headache resolves, many people enter the postdrome phase, often called a “migraine hangover.” This can involve lingering fatigue, difficulty concentrating, and a general washed-out feeling.
Aura Without Headache
About 5% of people with migraines experience what’s called a silent migraine: the full aura phase with no headache afterward. You get the flashing lights, the tingling, possibly the speech difficulty, and then it simply resolves. Silent migraines can also include dizziness, ringing in the ears, and difficulty speaking.
Silent migraines still follow the same brain mechanism as any other migraine with aura. They can still produce a postdrome hangover phase. They’re worth recognizing because the visual and sensory symptoms can be frightening if you don’t know what they are, and because having any form of aura carries the same implications for stroke risk and contraceptive choices as a full migraine with aura.
How Aura Affects Stroke Risk
People with migraine overall have a higher risk of stroke compared to people without migraine. Within the migraine population, having aura raises that risk further. A large database study found that people with migraine with aura had a 33% higher risk of stroke compared to those with migraine without aura. For ischemic stroke specifically (caused by a blood clot), the elevated risk was 38% compared to people without migraines.
In absolute terms, the risk of stroke for any individual remains low. But this elevated risk has real practical consequences. Several medical guidelines list migraine with aura as a contraindication to estrogen-containing birth control, including combination pills, patches, and rings. The concern is that estrogen combined with the vascular changes associated with aura creates compounding risk. If you experience aura, progestin-only methods are typically recommended instead.
Treatment Timing and Aura
Aura creates a tricky situation for treatment. The most commonly used acute migraine medications, called triptans, appear to work less effectively in attacks that involve aura. In pooled clinical trial data, pain-free rates two hours after treatment were 32% for attacks without aura but only 24% for attacks with aura. That translates to needing to treat about 6 people to get one additional pain-free result in attacks with aura, compared to about 4 people for attacks without.
Whether taking a triptan during the aura itself (before pain starts) helps or not remains genuinely unclear. Earlier studies suggested triptans weren’t effective when taken during the aura phase, but later research has challenged that conclusion. The clinical trials that showed reduced effectiveness didn’t actually track exactly when medication was taken relative to aura onset, so the picture is incomplete.
Another class of acute medication showed no difference in effectiveness between attacks with and without aura, with pain-free rates of about 27% to 29% regardless. This suggests that not all treatments are equally affected by the presence of aura, and people who find triptans less helpful during aura attacks may benefit from exploring alternatives with their provider.
Recognizing Aura vs. Something More Serious
The gradual onset of aura symptoms is the most important distinguishing feature. Migraine aura builds over minutes, spreads from one area to the next in a predictable march, and fully resolves. Stroke symptoms hit suddenly and don’t spread gradually. Weakness on one side of the body during aura can look nearly identical to a stroke, which is why new or unfamiliar neurological symptoms always warrant urgent evaluation, especially if they appear without warning, don’t resolve within an hour, or are accompanied by the worst headache of your life.
Once you’ve had several aura episodes and recognize the pattern, the experience becomes more familiar and less alarming. But any significant change in your usual aura pattern, such as new symptoms, longer duration, or symptoms that don’t fully resolve, is worth medical attention.