Written and medically reviewed by Tae Ho Guak, MD, board-certified neurologist · Reviewed July 2026 · Editorial policy
By Tae Ho Guak, MD — neurologist, 25 years and 100,000+ patients in headache practice
If you are reading this, there is a good chance you have already done the responsible things. You saw a doctor. Maybe you had a scan. You were told it was “just tension,” or “stress,” or “sinus,” handed a prescription, and sent on your way. And yet the headaches keep coming — sometimes worse than before.
Here is the part no one tells you plainly: a headache that isn’t getting better usually isn’t a mystery. It’s a headache that hasn’t been correctly named yet. After 25 years of seeing patients who arrived convinced nothing could be done, the single most common thing I find is not a rare disease. It’s a common condition that was never diagnosed precisely — and therefore never treated correctly.
This guide walks through why that happens, the diagnoses most often missed, the one trap that turns occasional headaches into daily ones, and how to tell when it’s time for a genuine second opinion.
Why “good” doctors miss headache diagnoses
It is rarely carelessness. Three structural reasons explain most of it.
1. A normal scan feels like an answer, but isn’t one. A clear MRI or CT is genuinely reassuring — it helps rule out the dangerous causes. But the most common disabling headaches, including migraine and cluster headache, do not show up on any scan. They are diagnosed by the pattern of your symptoms, not by imaging. Many people leave with “your scan is normal” and hear “there’s nothing wrong,” which are two very different sentences. (If you are wondering whether you even need imaging, see Brain CT — is radiation exposure really that dangerous?)
2. Headache is diagnosed by story, and appointments are short. Sorting migraine from tension-type from a trigeminal autonomic cephalalgia depends on details: how fast attacks peak, exactly where the pain sits, what happens to the eye on the painful side, what you do during an attack, how many days a month you reach for a pill. In a rushed visit, those details never get collected — so the diagnosis defaults to the vaguest label.
3. The most treatable pattern hides in plain sight. More on this next, because it deserves its own section.
The trap that turns a few headaches into daily ones
If you take a pain reliever — any pain reliever, including over-the-counter ibuprofen, acetaminophen, or combination pills — on roughly 10 or more days a month, you can develop what we call medication-overuse headache. The medicine relieves today’s pain but quietly lowers your threshold for tomorrow’s. Over months, occasional migraines can transform into a dull headache that is present almost every day.
Patients almost never suspect this, because the logic feels backwards: how can the thing that stops my headache be causing my headaches? But it is one of the most common reasons a headache disorder stops responding to treatment — and one of the most fixable, once it’s recognized. It cannot be solved by simply taking more medicine, which is exactly what the pattern pushes you to do. I wrote a full guide here: Medication-Overuse Headache — when painkillers cause the pain.
Five headache diagnoses that are commonly missed or mislabeled
Migraine mislabeled as “sinus” or “tension.” Surveys consistently find that a large share of self-diagnosed “sinus headaches” are actually migraine. If your “sinus headaches” have no infection, respond to migraine-specific treatment, or come with light sensitivity and nausea — that’s a clue.
Cluster headache and its relatives. Strictly one-sided pain around a single eye, attacks that make you restless and pacing (rather than lying still), and a red, teary, or drooping eye on the painful side point to a treatable family of headaches that is frequently missed for years. The right treatments look nothing like ordinary painkillers.
New daily persistent headache. A headache that started on a specific, memorable day and simply never left. It has its own workup and approaches, and it is often dismissed as anxiety.
Medication-overuse headache — described above, and worth naming twice.
Secondary headaches from treatable causes — for example headaches driven by uncontrolled blood pressure, sleep apnea, certain medications, or cerebrospinal fluid pressure problems. These need to be identified, not medicated around.
What a proper headache workup actually looks like
A thorough headache evaluation is less about high-tech testing and more about disciplined history-taking. Done well, it includes:
- A detailed attack profile — onset speed, location, duration, associated symptoms, and triggers.
- A headache-day and medication-day count, ideally from a simple diary, to catch the overuse pattern.
- A screen for red flags (see below) to be sure nothing dangerous is being missed.
- A review of what’s already been tried — which drugs, at what dose, for how long, and why they were stopped. “Migraine treatment failed” often turns out to mean a medication was under-dosed or abandoned after three days.
- A written plan with both a rescue strategy (for attacks) and, when appropriate, a preventive strategy (to reduce how often they come).
The last point matters most. Modern headache medicine — including CGRP-targeted preventives and newer acute options such as gepants — has changed what is possible. Many people labeled “treatment-resistant” simply never reached the current toolkit.
Red flags: when a headache needs urgent, in-person care
Most headaches are painful but not dangerous. A few are warnings. Seek prompt medical attention if you have a thunderclap headache (worst-ever pain peaking within a minute), a headache with fever and a stiff neck, new weakness, numbness, speech or vision changes, a headache after a head injury, or a significant new headache after age 50 or during pregnancy. These deserve evaluation now, not later.
When it’s worth getting a second opinion
Consider a fresh set of eyes if any of these are true: your headaches are costing you more than a few days a month; you’ve been on the same plan for months without improvement; you’ve never been given a specific diagnosis (only “tension” or “stress”); you’re relying on pain relievers most days; or you simply have the nagging sense that the story hasn’t fully been heard.
A second opinion is not about doubting your doctor. It’s about giving your case the unhurried, headache-specific attention that a busy general visit often can’t. Frequently, the fix is not an exotic new drug — it’s a more precise diagnosis and a properly sequenced plan.
A neurologist’s second opinion, without leaving home
I review your headache history, your records, and your current treatment, then tell you plainly what I would do next — and what I would stop doing. Twenty-five years of headache medicine, focused on your case.
Book a second opinion →This article is educational information, not medical advice, and does not create a doctor–patient relationship. It cannot address every individual situation. If you are worried about your headache — especially with any red-flag feature above — please seek care promptly.
From the textbook. Chapter 4, “The Headache Consultation: History, Examination and Phenotyping,” of my clinical textbook Headache Medicine covers this topic in full for doctors, with the evidence and decision pathways behind it. About the book →