Headache Red-Flag Checklist

Dr. Tae Ho Guak, MD β€” Neurologist
25 years Β· 100,000+ patients

Headaches You Should Never Ignore β€” A Red-Flag Checklist

Most headaches are not dangerous. But these signals call for medical care right away.

Use this one page to check for headaches that need urgent evaluation. If even one of the items below applies to you, stop self-diagnosing and see an emergency department or a neurologist without delay.

Go to a Doctor Now β€” Emergency Red Flags (any one → seek care)

Thunderclap headache
Reaches its worst within 1 minute. May signal bleeding in the brain — call emergency services.
A new headache after age 50
A headache that begins for the first time in mid-life needs its cause confirmed.
With neurological signs
Weakness or numbness, slurred speech, vision changes, or confusion — possible stroke.
With fever and a stiff neck
Possible meningitis or encephalitis. Be especially alert if light hurts or you are vomiting.
A “completely different” or steadily worsening headache
A sudden change in pattern, intensity, or frequency — or pain that keeps building over days to weeks.
Worsened by posture, coughing, or straining
Worse lying down, or with coughing or bearing down — pressure-related causes need to be ruled out.
New headache with cancer, low immunity, or pregnancy
With an underlying condition, the same headache should be evaluated more carefully.
Key principle  —  When these signs are present, the answer is testing, not “toughing it out” with painkillers. Don’t hesitate — get evaluated. For emergencies, call your local emergency number (e.g. 911 / 112) immediately.

Not an Emergency, But Worth a Consultation

Frequent painkiller use
≥10 days/month (triptans/combination) or ≥15 days/month (simple analgesics) → medication-overuse headache risk.
4 or more headache days a month
A frequency at which preventive treatment may help.
Disrupting daily life, sleep, or work
You often give up activities because of headache.
Weak response to current treatment
Your usual medication seems to work less and less.
One step further
Not sure where your headache fits? A headache specialist with 25 years of experience can personally review your symptoms and records.
Β· Free headache library: headachefree.doctor   Β· Specialist e-mail consultation: Talk to a Specialist
Sources: Headache red flags — SNNOOP10 (Do et al., Neurology 2019); medication-overuse headache — ICHD-3 (International Headache Society).
Medical disclaimer: This material is general health information and does not replace diagnosis, treatment, or prescription. Individual symptoms require evaluation by a clinician. If an emergency is suspected, call your local emergency number or go to the nearest emergency room. Β© 2026 HeadacheFree Β· Dr. Tae Ho Guak, Neurologist
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