A migraine is more than a bad headache. It’s a neurological event with a specific pattern: throbbing or pulsating pain (often on one side of your head), sensitivity to light and sound, nausea, and pain that gets worse when you move. If your headache checks those boxes, you’re likely dealing with a migraine. But the full picture involves more than just the pain itself.
The Core Features That Define a Migraine
Doctors diagnose migraine based on a consistent set of characteristics. You don’t need all of them, but you need most. The pain lasts between 4 and 72 hours if untreated. It has at least two of these four qualities: it’s on one side of your head, it pulses or throbs, it’s moderate to severe in intensity, and it gets worse with routine physical activity like walking or climbing stairs.
On top of the pain, you’ll experience at least one of the following: nausea or vomiting, or sensitivity to both light and sound. These accompanying symptoms are what separate a migraine from other types of headaches. About 69% of people with migraines meet clinical thresholds for light sensitivity, and many also experience something called cutaneous allodynia, where normally painless touch (like resting your head on a pillow or wearing a ponytail) becomes uncomfortable.
Migraines are also recurring. A clinical diagnosis typically requires at least five attacks that follow this pattern. A single episode that fits the description could be a migraine, but the pattern over time is what confirms it.
How Migraines Differ From Tension Headaches
Tension headaches are far more common and feel fundamentally different. They produce a dull, steady pressure or aching on both sides of the head, often described as a tight band wrapping around your skull. The pain is mild to moderate and may travel into your upper back and neck, but it doesn’t throb and it doesn’t get worse when you move around.
Migraines, by contrast, produce moderate to severe pain that throbs or pulses, typically on one side (though they can affect both sides or switch sides between episodes). The key functional difference: physical activity makes a migraine worse. If bending over, walking upstairs, or even turning your head intensifies the pain, that points toward migraine. Tension headaches don’t behave this way. Migraines also bring nausea and sensory sensitivity that tension headaches rarely cause.
The Four Phases of a Migraine Attack
A migraine isn’t just the headache. It unfolds in up to four distinct phases, and recognizing the early ones can help you respond faster.
Prodrome
Hours or even days before the pain starts, you may notice warning signs: mood changes like irritability or difficulty focusing, unusual fatigue, neck and shoulder stiffness, food cravings, frequent urination, or excessive yawning. These symptoms are easy to dismiss or attribute to a bad night’s sleep, but if they consistently precede your headaches, they’re part of the migraine itself.
Aura
About one in four people with migraines experience aura, a short-lived wave of neurological symptoms that usually develops gradually over at least five minutes and lasts up to an hour. Visual aura is the most common type. You might see zigzag lines floating across your vision, shimmering spots or flashes of light, blind spots outlined by geometric shapes, or temporary vision loss. Some people get sensory aura instead: tingling that spreads up an arm or across one side of the face. In roughly 20% of cases, aura lasts longer than 60 minutes, and it doesn’t always come before the headache. It can start after the pain has already begun.
Headache
The headache phase lasts from several hours to three days. Along with the throbbing pain, you may feel nauseated, anxious, unable to sleep, and intensely sensitive to sound, light, and even smell. Most people find it hard to function normally during this phase.
Postdrome
After the pain fades, many people enter a “migraine hangover.” You may feel drained, achy, dizzy, and have trouble concentrating. Light sensitivity can linger. This phase varies in length but can last a day or more, and it’s a real part of the attack, not just tiredness from being in pain.
What Triggers a Migraine
Migraines are more common in women, likely due to hormonal influences. Beyond that, triggers vary widely from person to person, but common ones include changes in sleep patterns, skipped meals, stress (or the letdown after stress), and hormonal shifts around menstruation. Weather is a well-documented trigger: bright sunlight, high humidity, barometric pressure changes, extreme heat or cold, and stormy weather can all set off an attack in susceptible people. These environmental shifts may cause imbalances in brain chemicals, including serotonin.
Tracking your triggers with a headache diary can be genuinely useful. Note the date, what you ate, how you slept, weather conditions, stress levels, and where you are in your menstrual cycle if applicable. Patterns often emerge within a few months that let you avoid or prepare for your most reliable triggers.
Migraines in Children Look Different
Children and adolescents can get migraines, but they don’t always look like the adult version. Attacks can be shorter, lasting as little as two hours. The pain is more often on both sides of the head rather than one, and kids may describe it as feeling like their heart is beating inside their head.
In younger children, migraines sometimes don’t involve headache at all. Abdominal migraine, which accounts for 4% to 15% of pediatric gastroenterology visits, causes recurrent episodes of stomach pain, nausea, vomiting, and pallor with little or no head pain. Adolescents can experience acute confusional migraines, marked by agitation and memory disturbance lasting up to eight hours, where the headache isn’t the primary symptom. These “migraine variants” often go undiagnosed but share the same periodic, hereditary pattern, and many children who have them go on to develop classic migraines later.
Signs a Headache Needs Urgent Attention
Most migraines, while miserable, aren’t dangerous. But certain features suggest something other than migraine is going on, and they warrant immediate medical evaluation.
- Sudden, explosive onset. A headache that reaches maximum intensity within seconds, sometimes called a thunderclap headache, can indicate a vascular emergency like a brain aneurysm. Migraines build gradually.
- New neurological symptoms. Weakness in an arm or leg, new numbness, slurred speech, or visual changes that don’t fit your usual migraine pattern can signal something more serious.
- Fever or systemic symptoms. Headache with fever, night sweats, or weight loss suggests an underlying illness rather than a primary headache disorder.
- First severe headache after age 50. New-onset headaches in older adults are more likely to have a secondary cause.
- Headaches that keep getting worse. A clear pattern of increasing severity or frequency over weeks or months is a red flag.
- Headaches that change with position. Pain that shifts dramatically when you stand up, lie down, cough, or strain may point to a pressure problem in or around the brain.
- New headache during or after pregnancy. This can signal vascular or hormonal conditions that need evaluation.
If your headaches follow a consistent pattern, respond to rest or treatment, and match the migraine characteristics described above, you’re most likely dealing with migraine. Getting a formal diagnosis from a healthcare provider opens the door to preventive strategies and targeted treatments that can significantly reduce how often attacks happen and how severe they are.