The Four Phases of a Migraine Attack Explained

A migraine is not simply a headache that arrives and leaves. It is a multi-stage neurological event, and understanding the migraine phases prodrome aura headache postdrome, and how each one behaves, changes how you track your condition and what your clinician can do with that information. Each phase is distinct, but they are all part of the same attack.

Why Migraine Phases Matter

Most people with migraine begin tracking when the head pain starts and stop when it ends. That captures maybe a third of what is actually happening. The phases before and after the headache can last just as long and affect functioning just as much.

If you only log pain, you undercount your monthly migraine burden, miss patterns in your early warning symptoms, and lose data that would help your clinician evaluate whether a treatment is working.

The Four Phases of a Migraine Attack

Phase 1: Prodrome

The prodrome, sometimes called the premonitory phase, is the first signal that an attack is coming. It can begin anywhere from a few hours to a full day before headache onset. Not everyone experiences a recognizable prodrome, but many people do and simply have not learned to identify it.

Prodrome symptoms reflect early changes in the brain, particularly the hypothalamus, which regulates appetite, mood, sleep, and autonomic function. Because of that broad influence, prodrome symptoms are varied:

• Fatigue out of proportion to activity
• Excessive yawning
• Mood shifts: irritability, low mood, or sometimes unusual euphoria
• Food cravings, especially for carbohydrates or sweets
• Neck stiffness
• Mild sensitivity to light or sound before any pain
• Difficulty concentrating or word-finding trouble
• Increased urination

One important note: food cravings during the prodrome are frequently mistaken for triggers. If you crave chocolate and a headache follows, the craving was likely a symptom of the attack already in progress, not the cause of it. Timestamped tracking is the only way to untangle this correctly. See migraine triggers and tracking for a detailed look at why that distinction matters.

Phase 2: Aura

Aura is a neurological phase that produces temporary, reversible sensory disturbances. It typically begins 20 to 60 minutes before headache onset, though in some people it occurs without any headache following.

Critically, aura does not affect everyone. Roughly one-third of people with migraine experience it. If you have never had visual disturbances or other neurological symptoms before a headache, that is completely normal and does not mean your migraine is less severe.

Common aura experiences include:

• Visual aura: The most common type. Flickering lights, zigzag patterns (called a scintillating scotoma), blind spots, or tunnel vision. These build and resolve gradually over 20 to 30 minutes.
• Sensory aura: Tingling or numbness, usually spreading from the hand up the arm and sometimes across the face.
• Speech aura: Difficulty finding words or slurred speech, usually brief.
• Motor aura: Weakness on one side of the body. This is a feature of hemiplegic migraine, a rarer subtype.

Each aura symptom follows the same pattern: it builds, reaches a peak, and then resolves. If neurological symptoms appear suddenly, reach full intensity immediately, or do not resolve, that warrants urgent medical attention rather than an assumption that it is aura.

Phase 3: The Headache Phase

The headache phase is the one people recognize most readily, but it is still worth understanding what characterizes it.

Migraine headache typically presents as moderate to severe pain, usually on one side of the head (though not always), with a pulsating or throbbing quality. Physical activity, including something as simple as walking up stairs, tends to worsen it. Two associated features are common enough to be part of the diagnostic criteria: nausea (sometimes vomiting) and sensitivity to both light and sound.

The headache phase usually lasts 4 to 72 hours without treatment. Within that range there is enormous variation. Some attacks resolve in a few hours; others are severe and prolonged. The intensity typically peaks within the first several hours and then, in most attacks, gradually diminishes.

Additional symptoms during the headache phase can include:

• Sensitivity to smell
• Neck pain or stiffness
• Cognitive difficulty, sometimes called brain fog
• Scalp tenderness (allodynia), where even light touch like brushing hair becomes painful
• Pallor and a preference for lying still in a dark, quiet room

Phase 4: Postdrome

Postdrome is the recovery phase. It begins after the headache ends and continues until the brain returns to its baseline state. Most people do not recognize it as part of the attack, which means they also do not log it.

The most common postdrome feature is cognitive fog: difficulty concentrating, slow thinking, and a sense that mental processing is operating at reduced capacity. Fatigue, mood changes, mild residual sensitivity to light or sound, and appetite changes are also typical. Postdrome usually resolves within 24 to 48 hours.

For many people, postdrome is the phase that most disrupts work and daily function. The headache is gone, so expectations reset to normal, but the capacity to meet those expectations is not yet back. Recognizing this as a real phase, and logging it, gives a clinician an accurate view of your actual attack burden.

The Four Phases at a Glance

How the Phases Connect to Your Attack Frequency

People tracking monthly migraine days often count only headache days. But prodrome days and postdrome days represent genuine impairment. An attack that includes a prodrome day, two days of headache, and a postdrome day has taken four days, not two.

This matters for functional impact scales, for discussions with your clinician about frequency, and for evaluating whether preventive treatment is making a meaningful difference. If a treatment shortens your headache phase but your prodrome and postdrome remain long, that is useful information. If the full attack duration is shrinking across all phases, that is a clearer signal that treatment is working.

What to Log for Each Phase

A log that captures all four phases gives your clinician more than a pain record. Useful data for each phase:

• Prodrome: Time of first unusual symptom, which symptoms appeared, severity
• Aura: Whether it occurred, type, duration, sequence of symptoms
• Headache: Onset time, pain side and quality, severity, associated symptoms, resolution time
• Postdrome: When it began (i.e., when the headache ended), which symptoms are present, when you feel fully back to baseline

What to log in a migraine diary covers the full framework in detail, including how to structure entries to make them useful for clinical review. For the practical side of building a consistent habit, how to track migraines accurately addresses what actually sustains a useful long-term log.

The migraine symptom checker is a useful tool for identifying which symptoms cluster around your attacks and at which phases they tend to appear.

Recognizing Your Personal Pattern

The four-phase model is a framework, not a rigid template. Your attacks may not follow every phase in the same order or with the same intensity each time. What matters is identifying your own patterns: which prodrome symptoms reliably precede your headaches, whether you experience aura and of what type, how long your headache phase typically runs, and what postdrome looks like for you.

That personal pattern only becomes visible with consistent data across multiple attacks. Recollections from memory are not reliable enough to identify it.

Logging each phase of your attacks in the Migraine Tracker: CGRP Log app builds a record across time that shows your clinician the full shape of each attack, not just the pain hours. That complete picture, how your attacks begin, what phases they move through, and how long recovery actually takes, is the kind of clinical data that makes it possible to evaluate treatment effectiveness accurately and to make informed decisions about your care.