A migraine is a neurological condition, not just a bad headache

A migraine is a type of headache caused by changes in brain chemistry and blood vessel activity, not by tension or pressure in your head. The pain is usually on one side of your head, often throbbing, and it typically lasts between 4 and 72 hours. Many people with migraines also experience nausea, sensitivity to light or sound, or vision changes before or during the attack.

The key difference between a migraine and a regular headache is that a migraine involves your nervous system in a specific way. Your brain's pain pathways activate, blood vessels dilate, and inflammatory chemicals are released around the nerves and blood vessels in your head. A regular tension headache, by contrast, usually comes from muscle tightness and feels like pressure or squeezing rather than throbbing.

Not every migraine feels the same, and not every migraine includes all these features. Some people have migraines with aura—visual disturbances like flashing lights or blind spots that appear 20 to 60 minutes before the headache starts. Others have migraines without aura, where the headache begins without warning signs.

Key Takeaways

  • A migraine is a neurological event involving changes in brain chemistry and blood vessel activity, not simply a severe tension headache.
  • Migraines typically throb on one side of the head and last 4 to 72 hours, often with nausea or light sensitivity alongside the pain.
  • Some migraines include aura—visual or sensory warning signs that appear before the headache begins.
  • Migraine triggers vary by person and can include stress, hormonal changes, certain foods, sleep disruption, or weather shifts.
  • Migraines are a medical condition that can be managed with medication, lifestyle changes, and trigger identification.

The phases of a migraine attack

A migraine typically unfolds in stages, though not everyone experiences all of them. Understanding these phases can help you recognize when a migraine is starting and take action early.

The prodrome phase happens hours or even a day before the headache begins. You might feel mood changes, fatigue, food cravings, or stiffness in your neck. Many people don't notice these signs until they look back after a migraine has started.

The aura phase, which about one-third of people with migraines experience, involves temporary neurological symptoms. These can include flashing lights, zigzag lines, blind spots, tingling in your arm or face, or difficulty speaking. Aura lasts 20 to 60 minutes and then fades as the headache pain begins.

The headache phase is the pain itself—throbbing, usually on one side, often with nausea, vomiting, or extreme sensitivity to light, sound, or smell. This is when most people need to rest in a dark, quiet room. The pain can last from 4 hours to 3 days.

The postdrome phase comes after the pain ends. You might feel exhausted, foggy, or emotionally drained for hours or even a day afterward. Some people feel relief and energy return quickly; others feel depleted for longer.

Common migraine triggers

Migraine triggers are highly individual—what sets off one person's migraine may have no effect on another. Keeping track of when your migraines happen and what was happening around that time can help you spot your own patterns.

Hormonal changes are a major trigger for many people, especially those who menstruate. Migraines often cluster around the time of your period or when hormone levels shift due to birth control or other medications. Stress and stress relief can both trigger migraines—the letdown after a stressful period is a common trigger time.

Sleep disruption is one of the most reliable triggers: too little sleep, too much sleep, or a sudden change in your sleep schedule can bring on a migraine. Skipping meals or dehydration can trigger them as well. Certain foods—aged cheeses, cured meats, chocolate, caffeine, or foods with MSG—trigger migraines in some people, though the connection isn't universal.

Sensory overload can set off a migraine: bright lights, loud noises, strong smells, or flickering screens. Weather changes, especially drops in barometric pressure, trigger migraines in many people. Overuse of pain medication—taking it more than 10 to 15 days per month—can actually cause medication overuse headaches that feel like frequent migraines.

How migraines are different from other headache types

A tension headache feels like a band of pressure around your head or neck, is usually mild to moderate, and doesn't throb. It typically lasts 30 minutes to a few hours and doesn't come with nausea or light sensitivity. Tension headaches are often caused by muscle tightness from stress or poor posture.

A cluster headache is rare but severe. It causes intense, burning pain on one side of the head, usually around the eye, and comes in clusters—multiple headaches over weeks or months, then long periods without any. Cluster headaches are much shorter than migraines (15 to 180 minutes) and don't usually involve nausea.

A sinus headache involves pressure and pain in your sinuses—forehead, cheeks, or bridge of nose—and is usually caused by sinus infection or congestion. It gets worse when you bend forward and improves when the sinus infection clears. True sinus headaches don't throb and don't come with the neurological symptoms of a migraine.

The distinction matters because different headache types respond to different treatments. A migraine won't improve with a decongestant, and a sinus headache won't respond to migraine medication. Knowing which type you have helps you and your doctor choose the right approach.

Why migraines happen in your brain

Researchers don't fully understand what causes migraines, but the current understanding involves your nervous system and blood vessels working together in an abnormal way. During a migraine, nerve cells become overactive and send out signals that cause blood vessels to constrict and then dilate. This activity triggers the release of inflammatory chemicals like serotonin and calcitonin gene-related peptide (CGRP).

These chemical changes irritate the nerves and blood vessels around your brain, creating the throbbing pain. The same process affects other parts of your nervous system, which is why you might feel nausea, see visual disturbances, or become sensitive to light and sound. Your brain's pain pathways are essentially misfiring in a specific, repeatable way.

Genetics play a strong role: if your parents or siblings have migraines, you're more likely to have them too. This suggests that some people's brains are wired in a way that makes them more prone to these neurological events. Environmental triggers—stress, hormones, sleep changes—can activate this tendency, but the underlying susceptibility is often inherited.

When to see a doctor about migraines

You should see a doctor if you're having frequent headaches that are affecting your daily life, if your headaches have changed in pattern or severity, or if you're unsure whether what you're experiencing is a migraine. A doctor can confirm the diagnosis, rule out other causes, and discuss treatment options with you.

Seek immediate medical attention if you experience a headache that is sudden and severe (the worst headache of your life), accompanied by fever, stiff neck, confusion, vision changes, difficulty speaking, numbness, or weakness. These can be signs of a serious condition that needs urgent evaluation.

If you're already diagnosed with migraines but they're becoming more frequent, more severe, or changing in character, tell your doctor. Changes in your migraine pattern can sometimes signal that something else is going on and warrant investigation.

Frequently Asked Questions

Can a migraine cause permanent brain damage?

Migraines themselves do not cause permanent brain damage. However, very frequent migraines or migraines with aura may be associated with small changes in brain structure that show up on imaging. These changes are not the same as damage and do not cause lasting harm. If you're concerned about the frequency or severity of your migraines, discuss this with your doctor.

Why do migraines run in families?

Migraines have a genetic component, meaning the tendency to have them can be inherited. If both your parents have migraines, your risk is higher than if neither does. However, genetics isn't the whole story—environmental triggers and life circumstances also play a role in whether and when migraines occur.

Can stress cause a migraine?

Yes, stress is a common migraine trigger for many people. Interestingly, both the stress itself and the relief from stress afterward can trigger a migraine. Some people notice migraines happen during a stressful period; others get them on the first relaxing day after stress ends.

Is a migraine the same as a stroke?

No, a migraine is not a stroke. However, migraines with aura involve temporary changes in blood flow to parts of your brain, which can feel alarming. If you experience sudden severe headache, weakness on one side of your body, difficulty speaking, or vision loss, seek emergency care to rule out stroke or other serious conditions.

Can children have migraines?

Yes, children can have migraines, though they may describe the pain differently or experience shorter episodes than adults. Childhood migraines can include abdominal pain instead of head pain. If your child has frequent headaches, talk to their doctor about what's happening and when.