Over 90% of headaches are not dangerous. The other 10% follow these specific patterns. Here’s how to tell which is which — and exactly when to put down the painkiller and pick up the phone.
Almost every adult will have a bad headache this year. Almost none of them will need a brain scan. So how do you know when yours is the one that does? After fifteen years in clinic, I can tell you the answer is rarely “it hurts more” — it is almost always about pattern.
The key insight
What separates a normal headache from a dangerous one is rarely intensity. It’s the pattern around it — when it starts, what triggers it, what comes with it.
The 6 Red-Flag Patterns
Most headaches are tension-type or migraine. They hurt — sometimes badly — but they’re not dangerous. The six patterns below are different. They suggest something structural in the brain may need looking at: a small bleed, raised pressure, an inflammation, or a clot. None of these is common, but each is too serious to miss.
