Migraine vs Headache: A Complete Diagnostic Guide

"It's just a headache" is one of the most frustrating things a migraine patient can hear. Migraines and headaches are fundamentally different conditions — different biology, different symptoms, different treatments. Getting the distinction right is the first step toward effective management.

This guide uses the ICHD-3 (International Classification of Headache Disorders, 3rd edition), the gold-standard diagnostic framework used by neurologists worldwide, to help you understand exactly what type of headache you may be experiencing.

The Major Primary Headache Types

Primary headaches are conditions where the headache itself is the disease — there is no underlying structural cause. The three most common primary headache types account for the vast majority of headaches seen clinically.

Tension-Type Headache (TTH)

The most common headache type, affecting up to 78% of the general population at some point in their lives (Stovner et al., 2007).

ICHD-3 Diagnostic Criteria for Episodic TTH:

• At least 10 episodes occurring on <15 days/month
• Lasting 30 minutes to 7 days
• At least two of the following:
• - Bilateral location
• - Pressing or tightening (non-pulsating) quality
• - Mild or moderate intensity
• - Not aggravated by routine physical activity (walking, climbing stairs)
• Both of the following:
• - No nausea or vomiting
• - No more than one of photophobia or phonophobia

What it feels like: A dull, constant pressure or tightness — like a band squeezing around your head. You can generally continue your daily activities, though concentration may be reduced. Most people describe it as annoying but manageable.

Common causes: Muscle tension, stress, poor posture (especially during desk work), eye strain, dehydration, or irregular meals.

Migraine Without Aura

Migraine affects approximately 12% of the population (18% of women, 6% of men) and is the second most disabling condition globally (GBD 2016 Study).

ICHD-3 Diagnostic Criteria:

• At least 5 attacks fulfilling the criteria below
• Headache attacks lasting 4-72 hours (untreated or unsuccessfully treated)
• Headache has at least two of:
• - Unilateral location
• - Pulsating quality
• - Moderate or severe pain intensity
• - Aggravation by or causing avoidance of routine physical activity
• During headache, at least one of:
• - Nausea and/or vomiting
• - Photophobia AND phonophobia

What it feels like: An intense, often one-sided throbbing that escalates with movement. You likely feel nauseated, seek a dark and quiet room, and struggle to function. Simple activities like walking, bending over, or climbing stairs make the pain worse. An untreated attack can last up to three days.

Cluster Headache

Rare but devastating, affecting about 0.1% of the population, with a male-to-female ratio of approximately 3:1.

ICHD-3 Diagnostic Criteria:

• At least 5 attacks fulfilling the criteria below
• Severe or very severe unilateral orbital, supraorbital, and/or temporal pain lasting 15-180 minutes
• Either or both of:
• - At least one ipsilateral (same-side) autonomic symptom: conjunctival injection (red eye), lacrimation (tearing), nasal congestion, rhinorrhoea, forehead/facial sweating, miosis (small pupil), ptosis (drooping eyelid), eyelid edema
• - A sense of restlessness or agitation

What it feels like: Often called the "suicide headache" due to its excruciating severity. The pain is usually centered behind or around one eye and can come on rapidly. Unlike migraine patients who seek stillness and quiet, cluster headache patients often pace, rock, or bang their head — the restlessness is characteristic. Attacks tend to occur in "clusters" lasting weeks to months, often at the same time each day (frequently at night).

Detailed Comparison Table

Other Headache Types to Be Aware Of

Medication Overuse Headache (MOH)

A paradoxical condition where frequent use of acute headache medication actually causes more headaches. This can develop if you take pain relievers (triptans, NSAIDs, combination analgesics, opioids) on 10-15+ days per month for 3+ months.

Cervicogenic Headache

Pain that originates from the cervical spine (neck) and is referred to the head. Often confused with migraine because it can be one-sided, but it's typically associated with neck movement, sustained posture, and neck tenderness.

New Daily Persistent Headache (NDPH)

A distinctive condition where a continuous headache begins one day and simply never goes away. The patient can usually identify the exact date of onset. It requires evaluation to rule out secondary causes.

The Three-Question Screener: ID Migraine

If you're wondering whether your headaches might be migraines, three validated screening questions (the ID Migraine screener) can help:

1. Has a headache limited your activities for a day or more in the last 3 months?
2. Are you nauseated or sick to your stomach when you have a headache?
3. Does light bother you when you have a headache?

If you answer "yes" to 2 or 3 of these questions, there is a 93% probability that your headaches are migraines. This screener was validated by Lipton et al. (2003) in a study of over 400 primary care patients.

Red Flag Symptoms: When Headache Is an Emergency

While the vast majority of headaches are primary (benign), certain symptoms indicate a potentially dangerous secondary cause that requires immediate evaluation. The mnemonic SNOOP4 helps clinicians — and patients — remember the red flags:

• Systemic symptoms (fever, weight loss, cancer history, immunosuppression, pregnancy)
• Neurological symptoms (confusion, weakness, vision changes, speech difficulty, seizures)
• Onset sudden (thunderclap headache — worst headache of your life reaching maximum intensity within seconds)
• Onset after age 50 (new headache pattern in someone over 50 raises concern for temporal arteritis, mass lesion, or other secondary causes)
• Pattern change (a new, different headache in someone with a known headache history)
• Positional (headache dramatically worse when lying down or standing up)
• Precipitated by Valsalva (coughing, straining, sneezing)
• Papilledema (swelling of the optic disc — detected by eye exam)

Getting the Right Diagnosis

Why Diagnosis Matters

The right diagnosis determines the right treatment. Tension headache treatment (OTC analgesics, stress management) is very different from migraine treatment (triptans, CGRP inhibitors, anti-nausea medication), which is very different from cluster headache treatment (high-flow oxygen, sumatriptan injection).

What Your Doctor Will Do

A headache evaluation typically includes:

1. Detailed history: Your doctor will ask about headache characteristics (location, quality, severity, duration, frequency), associated symptoms, triggers, family history, and medication use
2. Neurological examination: Testing cranial nerves, reflexes, strength, sensation, coordination, and gait
3. Diagnostic criteria application: Matching your symptoms against ICHD-3 criteria
4. Imaging if indicated: MRI or CT scan if red flags are present — but imaging is not routinely needed for typical migraine presentations

Prepare for Your Visit

Bring data that helps your doctor:

• Headache diary (at least 4 weeks of tracking)
• MIDAS or HIT-6 scores to quantify impact
• Complete medication list (including OTC drugs and supplements)
• Family history of headaches or migraines
• Your questions written down

Can You Have More Than One Type?

Yes. It is common to experience both migraines and tension-type headaches. Some patients have difficulty distinguishing the two — milder migraines can resemble tension headaches, and chronic tension headaches can develop migraine-like features over time. This is another reason why professional evaluation matters.

What to Do Next

1. Take our Migraine Quiz — a detailed assessment based on ICHD-3 criteria to screen for migraine
2. Use the HIT-6 Calculator — measure how your headaches impact daily functioning
3. Try the Severity Calculator — rate the overall severity of your headache episodes
4. Keep a diary — use our Diary Templates to track your symptoms before your next doctor visit

References

1. Headache Classification Committee of the International Headache Society. The International Classification of Headache Disorders, 3rd edition. Cephalalgia. 2018;38(1):1-211. ICHD-3

2. Lipton RB, Dodick D, Sadovsky R, et al. A self-administered screener for migraine in primary care: The ID Migraine validation study. Neurology. 2003;61(3):375-382. PubMed

3. Stovner LJ, Hagen K, Jensen R, et al. The global burden of headache: a documentation of headache prevalence and disability worldwide. Cephalalgia. 2007;27(3):193-210. PubMed

4. GBD 2016 Disease and Injury Incidence and Prevalence Collaborators. Global, regional, and national incidence, prevalence, and years lived with disability for 328 diseases. Lancet. 2017;390(10100):1211-1259. PubMed

5. Do TP, Remmers A, Schytz HW, et al. Red and orange flags for secondary headaches in clinical practice: SNNOOP10 list. Neurology. 2019;92(3):134-144. PubMed

This article is based on ICHD-3 diagnostic criteria and peer-reviewed research. It is for educational purposes only. Consult a healthcare provider for proper headache diagnosis and treatment.