What Is a Migraine Aura?
Aura is a temporary neurological phenomenon that may appear before or during a migraine. It usually develops gradually over several minutes and lasts up to an hour. Aura can serve as a warning that a migraine is about to begin, although some people experience aura without head pain.
The most familiar form of aura is visual, but it can affect touch, speech, or movement. Because the symptoms can resemble more serious conditions, it is helpful to know what a typical aura looks like. If you experience aura for the first time or notice a change in the pattern, seeking medical advice is important.
Common Aura Symptoms
Visual aura is the most common type. It may include flickering lights, zigzag lines, blind spots, or shimmering shapes. Some people describe a sensation of looking through a cracked window or heat haze. These visual disturbances usually expand across the field of vision over time.
Sensory aura often follows a visual aura. It can cause tingling or numbness, most often in the face, hands, or arm. The feeling may move slowly from one part of the body to another over several minutes. Less commonly, aura causes speech and language problems, such as difficulty finding words or slurred speech.
Types of Migraine With Aura
Migraine with aura is usually divided into categories based on the type of aura involved.
- Migraine with typical aura includes visual, sensory, or speech symptoms that gradually spread and resolve within one hour.
- Migraine with brainstem aura involves symptoms such as vertigo, double vision, or slurred speech, and originates from the lower brain region.
- Hemiplegic migraine is a rare type of aura that causes temporary muscle weakness on one side of the body.
- Retinal migraine is associated with repeated attacks of visual disturbance in one eye only.
How Aura Develops
Scientists have proposed that a wave of altered brain activity, known as cortical spreading depression, underlies migraine aura. This wave moves slowly across the surface of the brain and changes how neurons behave. The change in brain activity can affect blood flow and nerve signals, which helps explain why aura symptoms progress gradually across the visual field or body.
For many people, the aura phase ends as the headache phase begins. The headache often affects one side of the head, may be pulsing, and can worsen with light, sound, or movement. Some people, however, have only aura and never develop head pain. This is sometimes called silent migraine or aura without migraine.
Managing Migraine Aura
If you have migraine with aura, keeping a record of your triggers and symptoms can help you understand your pattern. Common triggers include stress, hormonal changes, irregular sleep, dehydration, certain foods, and flashing lights.
When an aura begins, some people find it helpful to move to a quiet, dark room, rest, and use a migraine treatment recommended by a healthcare professional. Several classes of medication can help prevent or shorten migraine attacks. Applying a cold or warm compress and staying hydrated may also provide relief.
For people who experience frequent migraine with aura, a treatment plan might include daily preventive medication, biofeedback, or other non-drug approaches. Because some preventive and acute treatments are not suitable for everyone, a clinician should be involved in any long-term plan.
When to Be Concerned
Sudden, severe headache, weakness, or a change in vision can be signs of a medical emergency. Aura symptoms that start after age 50, or that change significantly from your usual pattern, should also be evaluated promptly. While aura is usually temporary and harmless, a doctor can help rule out other conditions.
Knowing the difference between a usual migraine aura and a concerning symptom can give you confidence and help you respond quickly. The more you understand your own aura, the easier it may be to prepare for a migraine attack and reduce its impact on your day.