Most bad headaches, even very painful ones, are migraines: a common neurological condition that causes throbbing pain, nausea, and sensitivity to light. But a small number of headaches are warning signs of something more serious, like a stroke, meningitis, or bleeding around the brain. This guide compares migraine to the headaches that need urgent attention, and shows how to tell them apart.

1. Migraine

What it is: A neurological disorder that causes recurring headache attacks, often on one side of the head.

Typical presentation: Throbbing or pulsing pain that builds over an hour or more, usually paired with nausea, sensitivity to light and sound, and sometimes vomiting. About a quarter of people with migraine also get "aura," temporary visual changes such as flashing lights, zigzag lines, or a blind spot, that typically comes on gradually and resolves within an hour. Attacks commonly last anywhere from several hours to a few days.

Why it can look alarming: Severe pain, vomiting, and visual disturbances can feel frightening, but a headache that builds gradually, matches a person's usual migraine pattern, and improves with rest, dark rooms, or usual migraine medication is much more likely to be a migraine than an emergency.

Risk factors: A personal or family history of migraine, being female, and known triggers such as poor sleep, skipped meals, stress, hormonal changes, or certain foods and drinks.

2. Tension-Type Headache

What it is: The most common type of headache, linked to muscle tension and stress rather than a neurological attack.

Typical presentation: A dull, band-like pressure on both sides of the head, without the throbbing quality, nausea, or light sensitivity typical of migraine.

How it differs from migraine: Tension headaches rarely stop a person from continuing normal activity, while migraine often forces someone to lie down in a dark, quiet room.

Risk factors: Stress, poor posture, jaw clenching, long hours at a desk, and poor sleep.

3. Sinus Headache

What it is: Facial pressure caused by inflammation or infection in the sinuses.

Typical presentation: A dull ache or pressure across the forehead, cheeks, or behind the eyes that often worsens when bending forward, usually along with nasal congestion, thick discharge, or a low fever.

How it differs from migraine: True sinus infections come with visible nasal or facial symptoms, not just head pain. Many people who believe they have "sinus headaches" without nasal symptoms are actually experiencing migraine.

Risk factors: A recent cold, seasonal allergies, nasal polyps, or a deviated septum.

4. Cluster Headache

What it is: A severe, one-sided headache disorder that comes in repeated attacks over days or weeks.

Typical presentation: Intense, piercing pain around or behind one eye, often with a red or watery eye, a drooping eyelid, or a stuffy nostril on the same side. Attacks tend to last well under a few hours but can recur multiple times a day.

How it differs from migraine: Cluster headache pain is usually more sudden and severe than migraine, and a person with cluster headache often paces or rocks with restlessness, while someone with migraine typically wants to stay still.

Risk factors: More common in men and in people who smoke, with attacks that often follow a daily or seasonal pattern.

5. Stroke or TIA (Mini-Stroke)

What it is: A sudden interruption of blood flow to part of the brain, either lasting (stroke) or temporary (transient ischemic attack, or TIA).

Typical presentation: Headache is possible but is rarely the main symptom. The hallmark signs involve sudden weakness or numbness on one side of the body, slurred or garbled speech, drooping on one side of the face, trouble seeing, or a sudden loss of balance.

Why it can be mistaken for migraine: Migraine with aura can cause temporary visual changes, numbness, or tingling, which can resemble a stroke. The key difference is that migraine aura usually spreads gradually over minutes, while stroke symptoms typically appear all at once and do not shift or spread the way aura does.

Risk factors: High blood pressure, smoking, diabetes, high cholesterol, and an irregular heartbeat.

6. Meningitis

What it is: Inflammation of the tissue surrounding the brain and spinal cord, usually caused by a bacterial or viral infection.

Typical presentation: A severe headache along with a stiff neck, fever, and sensitivity to light. Confusion, drowsiness, or a rash that does not fade when pressed can also occur.

Why it can be mistaken for migraine: Migraine can also cause light sensitivity and a headache severe enough to send someone to bed. A true stiff neck (difficulty touching the chin to the chest) combined with fever is the detail that points toward meningitis rather than migraine.

Risk factors: Close contact with someone who has meningitis, a weakened immune system, and being unvaccinated against certain bacterial causes.

7. Bleeding Around the Brain (Subarachnoid Hemorrhage)

What it is: Bleeding into the space around the brain, often from a ruptured aneurysm, a true medical emergency.

Typical presentation: A sudden, extremely severe headache that reaches its worst intensity within seconds to a couple of minutes, often described as "the worst headache of my life." It may come with a stiff neck, vomiting, confusion, or loss of consciousness.

Why it can be mistaken for migraine: Both cause severe pain and nausea, but migraine pain typically builds gradually over minutes to an hour, while this kind of bleed peaks almost instantly. A first-ever headache of this sudden, extreme severity, especially in someone who does not have a history of migraine, should never be assumed to be a migraine.

Risk factors: High blood pressure, smoking, and a family history of brain aneurysms.

How to Tell the Difference

A few concrete details separate an ordinary migraine from a headache that needs urgent evaluation:

• Speed of onset: Migraine pain usually builds over minutes to an hour. A headache that hits full force within seconds needs emergency evaluation.
• Is this your usual pattern? A headache that looks and feels like your typical migraine attacks is far less concerning than a headache that feels completely different from anything you have had before.
• Neurological symptoms that do not fit aura: Sudden weakness on one side, slurred speech, facial drooping, or trouble walking point away from migraine and toward stroke.
• Fever plus stiff neck: This combination points toward meningitis and needs same-day medical attention.
• Age and history: A first severe headache after age 50, or a new headache pattern in someone with no migraine history, deserves medical evaluation rather than being assumed to be migraine.
• Response to rest and usual treatment: Migraine typically eases somewhat with a dark room, rest, or the medication that has worked before. Pain that keeps escalating despite these measures is a reason to seek care.

If your headache matches your usual migraine pattern and improves with your usual approach, it is reasonable to treat it at home and follow up with a doctor if attacks are becoming more frequent or harder to manage. If it does not fit that pattern, especially if it came on suddenly, feels like the worst headache of your life, or comes with any of the neurological signs above, treat it as a medical concern and get evaluated promptly rather than waiting to see if it passes.

When to Seek Medical Care