What Is a Migraine? Understanding Migraine Attacks and Their Symptoms

This guide breaks down “What is a migraine?” and how it unfolds in the body.

What Is a Migraine?

A migraine headache is a neurological condition marked by recurring attacks of moderate-to-severe head pain. The pain often throbs on one side of the head and worsens with movement, light, or sound. Nausea and vomiting frequently accompany it.

The mechanism behind migraine disorder involves the trigeminal nerve, the main pain pathway for the face and head. During a migraine, this nerve releases calcitonin gene-related peptide (CGRP). That release triggers inflammation and dilates blood vessels around the brain. This process explains the throbbing quality of migraine pain. It also explains why CGRP has become the target of most migraine treatments.

Migraine disorder affects more than one billion people each year worldwide. Women make up most of these cases, largely due to hormonal shifts tied to the menstrual cycle.

A migraine is also not a single symptom. It is a full-body neurological event that can last from 4 hours to 3 days if untreated. That range is usually the answer to how long can a migraine last, since duration depends heavily on how early treatment starts and in which phase.

Clinically, migraine is diagnosed using criteria from the international classification of headache disorders. For migraine without aura, the ICHD-3 diagnostic criteria require at least five attacks that meet the specified criteria. Migraine with aura has separate diagnostic criteria and requires at least two attacks.

How Is a Migraine Different from a Headache?

A migraine headache involves neurological symptoms beyond pain. Patients asked, “What does a migraine feel like?” tend to describe a deep, pulsing pressure behind one eye or temple, paired with a wave of nausea and an urge to escape light and noise entirely. A tension headache produces a dull, steady ache without those additional symptoms.

Knowing the key differences in migraine vs tension headache symptoms matters for treatment. Tension headaches usually respond to basic pain relievers and stress reduction. A migraine attack often requires targeted medication that addresses the underlying nerve activity. Tension pain rarely brings nausea, aura, or the same sensitivity to light and sound.

Recognizing the type of head pain you are dealing with is the first step. The next is understanding how many forms migraine itself can take.

What Are the Different Types of Migraine?

Migraine disorder is not one single experience. Several recognized subtypes exist, each with its own symptom pattern.

• Migraine with aura involves visual or sensory disturbances, such as flashing lights or tingling, before the headache begins.
• Migraine without aura is the most common form and skips the warning-sign aura phase entirely.
• Chronic migraine means experiencing headaches on 15 or more days a month, with at least 8 meeting migraine criteria.
• Episodic migraine describes attacks that occur fewer than 15 days a month.
• Silent migraine, also called acephalgic migraine, includes aura symptoms without a subsequent headache.
• Ocular migraine causes temporary visual disturbances or vision loss in one eye. Because the vision changes can be startling, patients frequently search “What is an ocular migraine?” to confirm it is a recognized, temporary condition.
• Abdominal migraine produces recurrent stomach pain and nausea, mainly in children, without a headache.
• Vestibular migraine centers on dizziness, balance problems, and vertigo, sometimes without noticeable head pain.

Each type shares the same underlying neurological process. The symptoms, though, can look completely different from one patient to the next.

Understanding the different phases of an attack helps explain what is a migraine beyond the headache itself is.

What Happens During a Migraine Attack?

Most migraine attacks move through four distinct phases. Recognizing them can help patients act earlier.

1.  Prodrome Phase

This phase starts hours or even a full day before the headache. Subtle signs like mood changes, food cravings, neck stiffness, or frequent yawning show up in the prodrome phase.

2. Aura Phase

The aura phase follows in roughly a quarter to a third of patients. Aura symptoms typically develop gradually and last 5 to 60 minutes for each symptom.

Aura can occur without any pain following it, which is what defines a silent migraine. This also answers a common question: yes, a migraine can happen without a headache. So, if you have been wondering: can you have a migraine without a headache? A silent migraine is the clearest proof that it does happen.

3. Headache Phase

It brings the throbbing pain most people associate with migraine. Nausea and sensitivity to light or sound usually accompany it. This phase can last from several hours to a few days.

4. Postdrome Phase

The postdrome phase is sometimes called the migraine hangover because it leaves patients feeling drained or foggy. Some describe mild scalp tenderness or trouble concentrating during this window. It can last a full day after the pain resolves.

Understanding this sequence explains why migraine feels so different from a standard headache. It also raises the next question worth answering: What triggers these migraine attacks?

What Can Trigger a Migraine?

Understanding what causes a migraine starts with looking at the categories that show up consistently in research and clinical practice:

• Hormonal shifts, particularly estrogen changes during menstruation, pregnancy, or menopause.
• Dehydration, skipped meals, and certain foods like aged cheese, alcohol, or processed meats.
• Chronic stress or sudden relief from stress, sometimes called a weekend migraine.
• Sensory input such as bright light, strong smells, or loud noise.
• Weather changes, especially shifts in barometric pressure.
• Sleep disruption, including too little sleep, irregular sleep timing, or poor sleep quality

A migraine diary tracking headache timing against sleep quality can also help make the trigger pattern obvious. Bringing that record to an evaluation can speed up diagnosis considerably.

How Does Sleep Affect Migraine Frequency?

• Poor sleep can trigger migraine attacks.
• Irregular sleep schedules may contribute.
• Sleep disorders may be associated with headaches in some people.

If migraines frequently occur in the morning or alongside snoring, unrefreshing sleep, or breathing problems during sleep, a sleep evaluation may be worth discussing with a healthcare professional.

Warning Signs of a Sleep-Related Migraine Pattern

Several warning signs suggest a sleep-related pattern is at play rather than a standalone migraine attack.

• Feeling awake even after a full night’s sleep.
• Still feeling exhausted within hours of waking, despite adequate hours in bed.
• Recurring headaches paired with one of the hidden health risks of snoring.

These overlap closely with the general signs of a migraine, which is why a sleep-focused evaluation is often the missing piece for patients asking, “What are signs of a migraine?” that keep recurring despite standard treatment.

Can TMJ or Teeth Grinding Cause Migraine?

Temporomandibular disorders (TMDs) and bruxism (repetitive teeth clenching or grinding) affect the jaw joints and the muscles responsible for chewing and jaw movement.

These conditions places repeated mechanical strain on the same trigeminal nerve pathway involved in migraine. That overlap is not a coincidence. The muscles used for chewing are close to nerve branches that also transmit head pain.

Jaw dysfunction tied to headaches & TMJ disorders tends to present with tenderness on waking. Patients with chronic jaw clenching often report morning headaches around the temples. This pattern mimics or worsens existing migraines. Addressing the mechanical source, rather than only treating the resulting headache, tends to bring longer-lasting relief.

TMJ management that reduces clenching pressure can ease headache frequency along with the jaw pain itself.

Recognizing how many overlapping conditions feed into migraine makes the bigger picture easier to see at a glance.

How Is Migraine Treated?

Knowing how to treat a migraine starts with separating two goals: stopping the pain in the moment with acute measures and using preventive measures to reduce how often attacks happen in the first place.

Acute Relief Measures

Acute treatments include over-the-counter pain relievers, triptans, and newer medications called gepants. These drugs work by blocking CGRP activity as the attack unfolds.

For patients asking how to get rid of migraine fast, taking these treatments at the very first sign of an attack should be combined with rest in a dark and quiet room.

Preventative Measures

Modern migraine treatments increasingly combine medication with addressing physical contributors like sleep and jaw tension, rather than medication alone.

CGRP-targeted drugs mark a shift in migraine care. Earlier preventives were often repurposed blood pressure or seizure medications. Newer options are formulated specifically around migraine’s underlying biology.

Botox has now become a well-established preventive option for patients with chronic migraine. OnabotulinumtoxinA received FDA approval for chronic migraine in 2010. Treatment involves injections across roughly 30 sites around the head, temples, and neck, repeated every 12 weeks. It works by interrupting pain signal transmission at the nerve and muscle level.

Oral appliance therapy offers a non-drug option when bruxism, TMJ tension, or airway restriction are contributing factors. A custom-fitted appliance worn during sleep can reduce clenching pressure. In patients with mild to moderate airway obstruction, it can also improve breathing and reduce nighttime triggers.

What Does a Sleep Evaluation for Migraine-Related Triggers Involve?

A home sleep test is usually the first step for suspected airway involvement. Devices like the WatchPAT One or ResMed ApneaLink Air track oxygen levels and breathing patterns overnight. Patients wear them at home.

The process generally moves through five stages:

1. Consultation
2. Device delivery
3. One or two nights of at-home testing
4. Expert analysis
5. Personalized treatment plan

For patients whose migraine pattern points toward jaw tension instead, a TMJ evaluation follows similar logic. A clinician examines jaw alignment, muscle tenderness, and bite patterns during a physical exam. That assessment determines whether bruxism or joint dysfunction is contributing to headache frequency. It also determines whether an oral appliance or targeted TMJ therapy makes sense.

When Does a Migraine Need Immediate Medical Attention?

Most migraine attacks, while disruptive, are not medical emergencies. A small number of warning signs do call for urgent evaluation.

• A sudden, severe headache described as the worst headache ever experienced.
• Headache paired with confusion, slurred speech, weakness, or vision loss.
• Migraine with a high fever or stiff neck, which can signal infection rather than a typical attack.
• A new headache pattern following a head injury or fall.
• Headache that worsens rapidly over minutes.

Any of these symptoms of migraine warrant emergency care. Knowing when a migraine is dangerous can be the difference between waiting out an attack and seeking care in time.

Is Migraine Ever Mistaken for Something Else?

Migraine shares symptoms with a few other conditions, which makes self-diagnosis unreliable.

Two mix-ups come up often enough to address directly:

1. Can Sinus Pressure Cause Migraine?

In most cases, what feels like sinus pain is actually a migraine attack. True sinus headaches are far less common than people assume, since sinus infections usually come with thick nasal discharge and fever rather than the light sensitivity and nausea that define migraine.

2. Can a Migraine Cause a Fever?

A typical migraine attack does not raise body temperature. If a headache shows up alongside fever or stiff neck, that combination points toward an infection rather than a standalone migraine. It is also one of the warning signs that calls for prompt medical evaluation.

Final Thoughts

Most migraine treatments stop at the headache. That’s exactly where it falls short for many patients. The trigger for migraine attacks could also be a clenched jaw or airway obstruction. Chasing the pain relief alone, without asking why it keeps coming back, tends to produce the same cycle month after month.

If snoring, restless sleep, or jaw tension show up alongside your migraine pattern, that overlap deserves attention. It’s not a coincidence. Denver Sleep Apnea Center offers home sleep testing and TMJ evaluations that uncover these triggers.

Schedule a consultation to find out whether what’s happening while you sleep is the reason your migraines won’t quit.