Understanding Headaches: Types, Causes, and When to See a Doctor

Most headaches are one of four patterns, and each responds to something different. This guide shows how to identify tension-type, migraine, cluster and medication-overuse headaches, what the evidence says works for each, and the red flags that mean stop self-treating and get evaluated now.

By Symptom Advisory Editorial Team — last reviewed September 3, 2026 — 7 min read

Key Takeaways

• Headache type is identified by pattern — location, quality, duration and what makes it worse — not by pain intensity.
• Tension-type headache is a dull, band-like, both-sided pressure that usually allows normal activity to continue.
• Migraine is typically one-sided and throbbing, worsened by routine movement, and accompanied by nausea or light and sound sensitivity.
• Cluster headache is a severe one-sided pain around the eye with tearing or nasal congestion on the same side, striking in daily bouts.
• Taking acute pain relief on more than 10-15 days a month can convert episodic headaches into chronic medication-overuse headache.
• A thunderclap headache reaching maximum intensity within a minute is a medical emergency until proven otherwise.
• A headache diary that logs sleep, meals, stress and medication for four weeks identifies triggers far better than memory does.
• Preventive treatment is worth discussing once headaches cost you four or more days a month.

Start with the pattern, not the pain score

Almost everyone describes their headache by how much it hurts. Clinicians do the opposite: they ask where it sits, what it feels like, how long it lasts, what makes it worse and what comes with it. Those five answers separate the common headache types more reliably than a 1-to-10 rating, and they point directly at what will actually help.

The great majority of headaches are primary — the headache is the condition itself, not a symptom of something else. A minority are secondary, caused by an underlying problem such as infection, high blood pressure crisis, bleeding, or medication overuse. The purpose of this guide is to help you recognize which pattern you have, and to be very clear about the situations where self-management is the wrong call.

The four patterns you are most likely to have

Tension-type headache

A dull, pressing, non-throbbing tightness across the forehead or around the head like a band. Usually mild to moderate, on both sides, lasting anywhere from 30 minutes to several days. It does not typically get worse when you climb stairs, and nausea is absent or minimal. Most people can keep working through it.

Common contributors: sustained screen posture, jaw clenching, poor sleep, dehydration, skipped meals, and psychological stress.

Migraine

Moderate to severe, often one-sided, and usually throbbing or pulsating. It typically lasts 4 to 72 hours untreated. What makes it recognisable is the company it keeps: nausea, vomiting, sensitivity to light and sound, and clear worsening with routine physical activity. About a quarter of people get an aura beforehand — visual zigzags, blind spots, tingling spreading up an arm, or trouble finding words — usually building over 5 to 20 minutes and resolving within an hour.

Migraine is a neurological disorder, not a bad headache. Treating it as a willpower problem is the main reason people go years without effective care.

Cluster headache

Excruciating, strictly one-sided pain centred behind or around one eye, lasting 15 minutes to 3 hours, striking up to eight times a day in bouts that run for weeks. The same-side eye waters and reddens, the eyelid droops, and the nostril runs or blocks. People with cluster headache pace and rock rather than lie still, which is the opposite of migraine behaviour. It is uncommon but distinctive, and it needs specialist treatment — high-flow oxygen and triptan injections are standard, over-the-counter tablets are useless.

Medication-overuse (rebound) headache

A headache that is present on most days, often there when you wake up, in someone who has been treating headaches frequently with analgesics or triptans. The trap is circular: the treatment relieves the pain for hours, then the headache returns, so the treatment is repeated. Withdrawal is the fix, and it usually gets worse before it gets better, which is why it should be planned with a clinician.

Quick comparison

What actually works, by type

For tension-type headache, the highest-yield interventions are unglamorous: consistent sleep and meal timing, hydration, a screen setup that keeps your neck neutral, and short movement breaks every 30 to 45 minutes. Simple analgesics work but must stay occasional. Where stress is the driver, cognitive behavioural approaches and relaxation training have real evidence behind them.

For migraine, timing dominates. Acute treatment taken within the first 20 to 30 minutes of pain onset works far better than the same drug taken two hours in. NSAIDs help mild attacks; triptans are the standard for moderate to severe ones; newer gepants and ditans exist for people who cannot use triptans because of cardiovascular risk. Lie down in a dark quiet room, treat the nausea as well as the pain, and hydrate.

Prevention becomes the priority once attacks cost you four or more days a month. Options range from established oral preventives to CGRP monoclonal antibodies given monthly or quarterly. Non-drug preventives with supporting evidence include regular aerobic exercise, a fixed sleep schedule, and structured trigger management.

For cluster headache, do not self-manage. The treatments that work are prescription and delivery-specific.

For medication-overuse headache, the only route out is reducing the acute medication, ideally with a bridge plan and a preventive started at the same time.

The trigger question, handled honestly

Triggers are real but overrated as single causes. Most attacks need a stack: a poor night's sleep plus a skipped meal plus a stressful afternoon. Chasing one food while ignoring sleep debt rarely helps.

The reliable ones across studies are sleep disruption in either direction, dehydration, missed meals, alcohol (especially red wine), hormonal fluctuation around menstruation, weather and barometric shifts, bright or flickering light, and the letdown period after stress rather than during it.

A four-week diary beats memory. Record date, start and end time, severity, what you took and when it worked, hours slept, meals, caffeine, alcohol, stress rating and — for menstruating people — cycle day. Patterns that were invisible usually appear by week three.

Red flags: stop self-treating

Call 911 or go to an emergency department for:

• A thunderclap headache — maximum intensity within 60 seconds, often described as the worst headache of your life.
• Headache with fever and a stiff neck, or with a rash.
• Headache with weakness, numbness, facial droop, slurred speech, vision loss or confusion.
• Headache after a head injury, particularly with vomiting or drowsiness.
• A first severe headache after age 50, or a headache with scalp tenderness and jaw pain when chewing.
• Headache that is progressively worsening over days to weeks, or consistently worse when lying down, coughing or straining.
• New headache in someone who is pregnant or recently postpartum, immunocompromised, or has a history of cancer.

Book a non-urgent appointment if headaches are increasing in frequency, are not responding to what used to work, require acute medication on more than 10 days a month, or are interfering with work, school or family life.

What to bring to the appointment

A good headache consultation takes about fifteen minutes if you arrive prepared. Bring your diary, a list of everything you have taken including over-the-counter products and supplements with the number of days per month you use them, a note of what has helped before and at what dose, and your family history — migraine runs in families and that history shortens the diagnostic path.

Most headache disorders are diagnosed on history alone. Imaging is reserved for red flags, an abnormal neurological examination, or a pattern that does not fit a recognised primary headache. A normal scan does not make the pain less real, and a scan will not tell you which treatment to use.

The bottom line

Identify the pattern first, because the effective treatment differs completely between types. Treat migraine early and specifically. Keep acute medication under 10 days a month to avoid trading episodic headaches for daily ones. Track for four weeks before drawing conclusions about triggers. And treat sudden, severe, or neurologically accompanied headaches as emergencies rather than puzzles to solve at home.

Practical Checklist

• Drink at least 8 glasses of water daily
• Maintain a consistent sleep schedule of 7-9 hours
• Take breaks from screens every 20 minutes
• Keep a headache diary for at least 2 weeks
• Check your workspace ergonomics
• Have over-the-counter pain relievers on hand
• Practice one stress-reduction technique daily
• Schedule a doctor visit if headaches change pattern
• Avoid known trigger foods and drinks
• Exercise moderately for 150 minutes per week

Frequently Asked Questions

How do I tell a migraine from a tension headache?

Migraine is usually one-sided, throbbing, worsened by routine movement, and comes with nausea or light and sound sensitivity. Tension headache is a both-sided dull pressure that generally lets you continue normal activity without nausea.

Can a headache be a sign of high blood pressure?

Ordinary high blood pressure rarely causes headaches. A severe headache alongside a very high reading, chest pain, shortness of breath or neurological symptoms can indicate a hypertensive emergency and needs immediate care.

What is a thunderclap headache?

A headache that goes from nothing to maximum intensity within about a minute. It can signal bleeding around the brain and is a medical emergency, even if it eases afterwards.

How many days a month can I safely take painkillers for headaches?

As a general rule, keep simple analgesics under 15 days a month and triptans or combination products under 10. Above that, medication-overuse headache becomes a real risk.

Do I need a brain scan for headaches?

Usually not. Most primary headache disorders are diagnosed from the history and examination. Imaging is indicated for red flag features, an abnormal neurological exam, or a headache pattern that does not fit a recognised type.

Why do headaches often start on the weekend?

Letdown after a stressful week, sleeping later than usual, and delayed caffeine all converge on Saturday morning. Keeping wake time and caffeine timing consistent across the week helps more than most people expect.

Are migraines hereditary?

There is a strong familial component. Having a first-degree relative with migraine substantially increases your likelihood, which is why family history is one of the first questions a clinician asks.

Does caffeine help or cause headaches?

Both. It can boost the effect of analgesics in an acute attack, but regular high intake and irregular timing produce withdrawal headaches. Consistency matters more than the absolute amount.

When should I consider preventive medication?

Common thresholds are four or more headache days a month, attacks that do not respond well to acute treatment, or significant disruption to work and daily life despite treating properly.

Sources & References

1. Headache: Hope Through Research — National Institute of Neurological Disorders and Stroke (NINDS) link
2. International Classification of Headache Disorders, 3rd edition — International Headache Society link
3. Migraine — Diagnosis and Treatment — Mayo Clinic link
4. Cluster Headache — American Migraine Foundation link
5. Medication Overuse Headache — American Headache Society link
6. Acute Treatment of Migraine in Adults — Consensus Statement — American Headache Society link
7. Stroke Signs and Symptoms — Centers for Disease Control and Prevention link
8. Headaches in Adults — MedlinePlus, U.S. National Library of Medicine link
9. Giant Cell Arteritis — National Institute of Arthritis and Musculoskeletal and Skin Diseases link

Medical disclaimer

This article is health information for education only. It is not medical advice, a diagnosis or a treatment plan. In an emergency, call 911. Researched and drafted with AI-assisted tools and fact-checked by a human editor against the sources listed above. How we create our content.