Headaches: The Six Types, and When to Worry

Almost everyone gets headaches, and almost everyone at some point wonders whether this one is different. The useful news is that the overwhelming majority of headaches are not caused by anything dangerous inside the head. The genuinely worrying ones tend to announce themselves by their pattern rather than by how much they hurt, and that pattern is learnable in ten minutes.

Primary and secondary: the split that matters#

Doctors divide headaches into two groups.

Primary headaches are conditions in their own right. The brain's pain-signaling system is misfiring, but there is no tumor, no bleed, no infection. Migraine, tension-type headache and cluster headache are all primary. They can be severe, disabling and life-limiting, and they are still not dangerous in the sense of shortening your life.

Secondary headaches are a symptom of something else: an infection, bleeding, raised pressure inside the skull, a medication effect, a sinus infection, very high blood pressure, or a problem with the neck, jaw or eyes. These are a minority, but they are why the pattern matters.

The brain itself has no pain receptors. Headache pain comes from the coverings of the brain, the blood vessels, the nerves of the face and scalp, and the muscles of the neck and jaw. That is worth knowing because it explains why a headache can feel like it is deep inside your head while the actual source is a membrane, a vessel or a muscle.

The six types most people actually have#

Tension-type headache#

The most common headache in the world. A steady band of pressure across the forehead or around the head, often with tight neck and shoulder muscles. It rarely stops people working, which is exactly why it goes untreated for years and quietly slides into a daily pattern. Triggers are unremarkable and cumulative: poor sleep, sustained screen posture, stress, skipped meals, dehydration, jaw clenching.

Migraine#

Migraine is not a bad headache. It is a neurological condition with a headache as its most obvious feature. Attacks often move through phases: a vague prodrome hours or a day ahead with yawning, food cravings, mood change or neck stiffness; sometimes an aura of zigzag lines, blind spots or tingling spreading over five to sixty minutes; then the headache with nausea and a strong dislike of light, sound and smell; then a washed-out day afterwards.

It is far more common in women, it very often runs in families, and it is regularly misdiagnosed as sinus trouble because migraine can produce facial pressure and a stuffy nose. If a recurrent headache reliably stops you functioning and comes with nausea or light sensitivity, migraine is the most likely label, whatever it has been called before.

Two points people are rarely told. First, treating an attack early, while pain is still mild, works far better than waiting to see if it becomes a bad one. Second, if you are having attacks on more than about four days a month, or attacks that respond poorly, preventive treatment exists and is worth asking about specifically. Several established preventive options are ordinary medicines used at low doses, and newer targeted treatments exist as well. Which one suits you depends on your other conditions, so that is a conversation for your own doctor rather than a decision to make from a list.

Cluster headache#

Rare, and unmistakable to anyone who has had it. Severe one-sided pain around one eye, lasting fifteen minutes to three hours, striking in bouts over weeks, often at the same time each night. The eye on that side waters and reddens, the eyelid may droop, the nostril blocks. People pace, rock or hold their head rather than lying still, which is the opposite of migraine behavior.

Cluster headache is frequently dismissed as migraine or sinusitis for years. It has specific treatments, including high-flow oxygen, that are genuinely effective and are not the same as migraine treatment. If this description matches you, ask for referral rather than another painkiller.

Medication overuse headache#

This is the most important cause on the list, because it is common, entirely reversible, and almost never suspected by the person who has it. Using acute pain relief for headache on more than roughly ten to fifteen days a month, for more than three months, can convert an episodic headache into a daily one. The headache is typically present on waking and eases briefly after each dose, which reinforces the cycle.

Combination painkillers, anything containing codeine or opioids, and triptans do this most readily. Simple single-ingredient painkillers do it at the higher end of that frequency range.

Sinus headache#

Genuine sinus headache accompanies a genuine sinus infection: blocked nose, thick discolored discharge, reduced sense of smell, facial tenderness, often fever, and the pain follows the illness. Recurrent facial pressure with clear nasal symptoms and no infection is usually migraine wearing a disguise.

Cervicogenic headache#

Pain that begins in the neck or the base of the skull and spreads over one side of the head, with restricted neck movement and tenderness. Common in people who spend long hours at a fixed screen height, drive for a living, or carry loads on one shoulder. It responds to neck treatment, not to escalating painkillers.

The warning signs that change the plan#

These are the features that move a headache from a nuisance to something needing assessment, and they are worth memorising.

Same-day emergency assessment:

• A headache that reaches maximum intensity within about a minute, whatever the eventual severity. This is the pattern that can indicate bleeding around the brain and it is judged on speed of onset, not on how bad it feels.
• Headache with fever and neck stiffness, dislike of light, drowsiness, confusion, or a rash that does not fade when pressed under a glass.
• Headache with any new neurological sign: weakness or numbness on one side, slurred speech, facial droop, double vision or loss of vision, unsteadiness, or a seizure.
• Headache after a head injury, particularly with vomiting, drowsiness, or in anyone taking anticoagulant medicines.
• Headache with a red, painful eye and blurred vision or haloes around lights, which can indicate acute glaucoma.

Prompt, but not emergency, review:

• A completely new type of headache starting after age 50, especially with scalp tenderness, jaw pain on chewing, or visual disturbance.
• A headache that is steadily worsening over days to weeks rather than coming in attacks.
• Headache clearly worse when lying flat, on coughing, sneezing or straining, or waking you from sleep.
• New headache in pregnancy or the six weeks after delivery, particularly with swelling, visual change or upper abdominal pain.
• New headache in someone with cancer, HIV, or on immune-suppressing treatment.
• A change in your usual headache pattern that you cannot explain.

What a doctor will actually do#

Far more history than examination, and far more examination than testing. Expect questions about speed of onset, one side or both, duration, what you do during an attack, what accompanies it, how many days a month you have any headache at all, and how many days a month you take anything for it. That last question is asked for a reason.

Examination usually covers blood pressure, the back of the eyes to look for signs of raised pressure inside the skull, a brief neurological check, and the neck, jaw and scalp arteries. Blood tests are used selectively, most often an inflammatory marker in an older person with new headache and scalp tenderness. Imaging is reserved for the red-flag patterns above.

The most useful thing you can bring is a headache diary covering four to six weeks: date, duration, severity out of ten, what you took, whether it worked, and anything notable about sleep, food or stress that day. It is dull to keep and it changes the consultation completely.

What helps, and what is oversold#

Regular sleep and regular meals genuinely reduce migraine frequency, and the effect is not small. Hydration helps if you are actually short of fluid. Aerobic exercise a few times a week has reasonable evidence as a migraine preventive. So does reducing caffeine to a stable, modest, consistent amount, since both excess and withdrawal provoke headaches. Managing sustained neck posture helps tension-type and cervicogenic headache more than anything in a packet.

Elimination diets that remove long lists of foods are mostly disappointing. Trigger foods are real for some people but far less consistent than the internet suggests, and the effort is usually better spent on sleep and meal regularity. Broad food intolerance testing does not identify headache triggers. Most supplements marketed for headache have thin evidence, although a small number, including magnesium and riboflavin, have modest supportive data for migraine prevention and are worth raising with your doctor rather than trialling blind alongside other treatments.

What I actually see in clinic#

Two things come up again and again.

The first is people who have had migraine for fifteen years and have never once been given the diagnosis, because their headaches were labeled sinus or stress. They have been taking a decongestant and a painkiller for a decade. Naming it correctly changes the whole treatment plan, and often the person's sense of themselves as someone who simply cannot cope with normal life.

The second is medication overuse headache. Almost nobody arrives suspecting it. When I ask how many days a month someone takes something for their head, the answer is often twenty or more, and the connection has never been raised. The conversation is difficult, because the honest version is that the thing giving short-term relief is sustaining the problem. But of everything on the list here, it is the one where getting it right most reliably transforms someone's month.

At work#

Workplace headaches are usually a combination of posture, light, noise, heat and hydration, and they are worth taking seriously because they cost more days than most people admit.

For desk work, the two things that matter most are screen height at eye level and a genuine break in fixed neck posture every 30 to 45 minutes. Glare from a window behind the screen and old spectacle prescriptions are underrated causes. Anyone with new frequent headaches at a desk should have their vision checked before anything else is added.

In industrial settings the drivers are different: heat and inadequate fluid replacement, noise, chemical exposures such as solvents and carbon monoxide, and shift patterns that cut sleep. A headache that improves on days off and returns within hours of arriving at work should raise the question of an exposure, and that deserves a proper occupational health review rather than a painkiller. Carbon monoxide in particular can cause headache in several people in the same area at once, and that specific pattern needs immediate action.

Migraine at work is also a practical problem. Bright fluorescent light, screen flicker, strong smells and skipped meals during long shifts all raise attack frequency. Reasonable adjustments, such as a quiet space to take acute treatment early, protected meal breaks and screen filters, are widely accepted and worth requesting.

The bottom line#

Most headaches are primary and not dangerous, and the two you are most likely to have are tension-type and migraine. Learn the small list of red flags, because it is the pattern of a headache rather than its severity that signals trouble. If you are reaching for pain relief for your head on more than ten to fifteen days a month, that itself may now be the problem and it is fixable. And if a headache arrives at full force in under a minute, or comes with fever and a stiff neck or any new neurological change, that is an emergency department, not a wait-and-see.