How a migraine differs from a regular headache

A migraine is not just a bad headache—it is a neurological condition that affects how your brain processes pain signals. During a migraine, blood vessels in your brain constrict and then dilate (widen), and chemicals in the brain change in ways that trigger intense throbbing pain, usually on one side of your head. This process can last for hours or even days.

A regular tension headache feels like steady pressure around your whole head, often from stress or muscle tightness. A migraine is different: the pain is usually throbbing, it often stays on one side, and it comes with other symptoms like nausea, sensitivity to light, or sensitivity to sound. Many people with migraines also experience warning signs before the headache begins.

Not every severe headache is a migraine, and not every migraine is equally severe. But the pattern matters: if your headaches follow a similar sequence of symptoms each time, and they interfere with your daily life, that pattern is what doctors use to identify a migraine.

Key Takeaways

  • A migraine is a neurological condition where blood vessels in the brain constrict and dilate, causing throbbing pain usually on one side of the head.
  • Migraines often come with nausea, vomiting, or extreme sensitivity to light and sound, which regular headaches typically do not.
  • Some people experience warning signs called an aura—such as flashing lights, blind spots, or tingling—before the migraine pain starts.
  • A migraine can last from four hours to three days, and the severity and symptoms are similar each time for the same person.
  • Migraines run in families and are more common in women than in men.

The stages of a migraine attack

A migraine typically unfolds in stages, though not everyone experiences all of them. The prodrome is the earliest stage, happening hours or even a day before the headache begins. During this time, you might feel unusually tired, crave certain foods, feel irritable, or notice your neck is stiff. Many people do not recognize these as migraine warning signs until they have had several attacks.

The aura is the second stage and happens in about one-third of people with migraines. An aura is a temporary disturbance in vision or sensation that lasts between 5 and 60 minutes. You might see flashing lights, zigzag lines, or blind spots in your vision. Some people experience tingling in their hands or face, or difficulty finding words. The aura is not dangerous, but it signals that a migraine headache is likely coming within the next hour.

The headache phase is when the throbbing pain begins, usually on one side of the head. The pain can be mild at first and build over time, or it can start severe. During this phase, you are likely to feel nausea, and bright light or loud noise may feel unbearable. Some people vomit. This phase typically lasts 4 to 72 hours.

The final stage is the postdrome, sometimes called a migraine hangover. After the headache pain fades, you might feel exhausted, confused, or emotionally drained for hours or even a day. Your neck may still feel stiff, and you might feel unusually sensitive to light or sound even though the worst is over.

What triggers a migraine

Migraine triggers vary widely from person to person, and identifying your own triggers is one of the most useful things you can do. Common triggers include hormonal changes (particularly in women around their menstrual cycle), skipped meals or dehydration, lack of sleep, stress or sudden stress relief, caffeine withdrawal, and certain foods like aged cheeses, processed meats, or foods containing monosodium glutamate (MSG).

Environmental triggers matter too: bright or flickering lights, strong smells, loud noise, or changes in weather or barometric pressure can set off a migraine in some people. Physical exertion, especially sudden intense exercise, triggers migraines in others. Some people find that certain medications, including some birth control pills, make migraines more frequent or severe.

The relationship between triggers and migraines is not always straightforward. You might eat a trigger food and have no migraine, or you might have a migraine with no obvious trigger. Often a migraine results from a combination of factors—for example, skipped meals plus stress plus poor sleep—rather than a single trigger. Keeping a migraine diary (a simple record of when migraines happen and what you were doing beforehand) helps you spot your own patterns.

Why migraines happen in the brain

Researchers do not yet fully understand why migraines occur, but they know the process involves changes in brain chemistry and blood flow. The condition appears to involve an imbalance of neurotransmitters—chemical messengers in the brain—particularly serotonin, which regulates pain signals. When serotonin levels drop, blood vessels in the brain first narrow and then widen rapidly, triggering the characteristic throbbing pain.

The trigeminal nerve, a major nerve in the face and head, also plays a role. During a migraine, this nerve becomes inflamed and releases chemicals that cause more blood vessel dilation and further pain signaling. This is why migraine medications often target serotonin or work to calm the trigeminal nerve.

Migraines tend to run in families, suggesting a genetic component. If both your parents have migraines, your risk is higher. Women are about three times more likely to have migraines than men, and hormonal factors appear to play a role in this difference.

When to see a doctor about headaches

You should see a doctor if headaches are new, if they follow a pattern that is changing, if they are the worst headache you have ever had, or if they are accompanied by fever, stiff neck, confusion, vision changes, difficulty speaking, numbness, or weakness. These could signal a more serious condition that needs immediate attention.

You should also see a doctor if headaches are interfering with your work, school, or daily life, or if over-the-counter pain relievers are not helping. A doctor can confirm whether you have migraines, rule out other causes, and discuss treatment options that might reduce how often migraines happen or how severe they are.

When you see a doctor, be ready to describe your headaches: where the pain is, how long it lasts, what it feels like, what happens before and after, and what makes it better or worse. If you have been keeping a migraine diary, bring it with you. This information helps your doctor understand your pattern and recommend the right approach.

How migraines are diagnosed

There is no blood test or imaging scan that definitively diagnoses a migraine. Instead, doctors diagnose migraines based on your description of the headaches and their pattern. Your doctor will ask detailed questions about when the migraines started, how often they happen, how long they last, where the pain is located, and what other symptoms you experience.

Your doctor may order imaging tests like an MRI or CT scan if your headaches are new, if they have changed significantly, or if they are accompanied by neurological symptoms like weakness or vision loss. These tests rule out other causes like tumors, infections, or blood vessel problems. In most cases, if your headache pattern is typical for migraines and you have no warning signs of something else, imaging is not necessary.

Keeping a headache diary for a few weeks before your appointment helps your doctor see the pattern. Write down the date, time, duration, pain level (on a scale of 1 to 10), location, associated symptoms, what you were doing when it started, and what helped. This record is often more useful than any test.

Living with migraines

Once you understand your migraine pattern and triggers, you can take steps to reduce how often they happen. This might mean adjusting your sleep schedule, eating regular meals, staying hydrated, managing stress, or avoiding specific foods or situations. Some people find that regular exercise, meditation, or biofeedback helps prevent migraines.

When a migraine does start, resting in a dark, quiet room and taking pain medication early—before the pain becomes severe—often helps. Some people find that applying heat or cold to the head or neck, or lying down with a cool compress, provides relief. Staying hydrated during and after a migraine can also help.

If migraines are frequent or severe, your doctor may recommend preventive medications that reduce how often they occur or how intense they are. These are different from pain relievers taken during an attack. Preventive medications work best when combined with identifying and avoiding your triggers.

Frequently Asked Questions

Can a migraine cause permanent brain damage?

No. While a migraine can be extremely painful and disruptive, it does not cause permanent damage to the brain. However, very frequent migraines can affect your quality of life, so talking to a doctor about prevention is worthwhile if migraines are happening often.

Is a migraine with aura more serious than one without?

A migraine with aura is not inherently more dangerous, but it does give you advance warning that a migraine is coming. Some research suggests that people who have migraines with aura may have a slightly higher risk of stroke, so mention this to your doctor if it applies to you.

Can stress cause a migraine?

Stress is a common migraine trigger for many people. Interestingly, both stress itself and the relief of stress after a stressful period can trigger a migraine. Stress management techniques like exercise, meditation, or counseling may help reduce how often migraines happen.

Why do migraines run in families?

Migraines have a genetic component, meaning the tendency to have them can be inherited. If your parents or siblings have migraines, your risk is higher. However, having a family history does not mean you will definitely have migraines.

Can children have migraines?

Yes, children can have migraines, though they may describe the symptoms differently than adults. A child might say their head hurts on one side, or they might complain of stomach pain instead of a headache. If you notice your child has recurring headaches that follow a pattern, mention it to their doctor.