Headaches are common, but not all are safe. Some secondary headaches can be life-threatening. If any of these 7 signs appear, go to the ER immediately.
1. Thunderclap Headache
Explosive onset within seconds — the worst headache of your life. Classic sign of subarachnoid hemorrhage.
2. First Headache After Age 50
New headache in middle age or later: suspect tumor, temporal arteritis, or other secondary causes.
3. Neurological Symptoms
- Weakness or numbness on one side
- Slurred speech
- Blurred or double vision
- Altered consciousness
- Seizures
4. High Fever + Stiff Neck
Classic triad of meningitis. Call emergency services immediately.
5. Headache After Head Trauma
May indicate epidural or subdural hematoma. Never ignore post-traumatic headache even with a pain-free interval.
6. Worsening Despite Medication
Headache worsening progressively over days/weeks, or worst in the morning — consider intracranial hypertension or mass lesion.
7. Headache with Systemic Symptoms
Unexplained weight loss, night sweats, or persistent fever with headache may suggest malignancy or systemic infection.
Most headaches are primary and benign — but when in doubt, always get checked. → Back to Headache Information Library