Reference — Neurology
Headache Red Flags (SNOOP) Reference
Most headaches are benign — but a few are emergencies. SNOOP is the screen that separates a routine migraine from a bleed, an infection, or a tumor before you treat the pain.
Educational use only. Any red-flag headache needs urgent provider evaluation. This reference is an educational screening aid, not a diagnostic protocol. This material supports nursing education and exam review. It is not medical advice and is not a substitute for clinical judgment, institutional policy, or medical direction. Always follow facility protocols and current provider orders.
The SNOOP Red Flags
| Letter | Red flag | Worry |
|---|---|---|
| S — Systemic | Fever, weight loss, immunosuppression, cancer history | Meningitis, brain abscess, metastasis |
| N — Neurologic | Focal deficits, confusion, seizures, papilledema | Mass, stroke, raised ICP |
| O — Onset | Sudden, severe 'thunderclap' — worst headache of life, peaks in seconds | Subarachnoid hemorrhage |
| O — Older | New headache after age 50 | Temporal (giant cell) arteritis, mass |
| P — Pattern / Positional / Papilledema | A new or changed pattern, worse lying down or with Valsalva, or papilledema | Raised ICP, mass, venous thrombosis |
The Can’t-Miss Emergencies
Thunderclap headache (“worst headache of my life,” maximal in seconds) → subarachnoid hemorrhage until proven otherwise. Headache + fever + stiff neck → meningitis. New headache > 50 with jaw claudication/scalp tenderness/visual change → temporal arteritis (start steroids urgently to save vision). Headache worse lying down/with Valsalva + papilledema → raised ICP/mass.
Nursing Escalation
If any red flag is present, do not simply medicate — notify the provider and anticipate urgent workup (CT/CTA, LP, ESR/CRP). Compare to the patient’s usual headaches; a different or worst-ever headache is the key trigger to escalate. Perform a focused neuro exam and monitor for deterioration while awaiting evaluation.
NCLEX Pearls
- ✦SNOOP = Systemic, Neurologic, Onset sudden (thunderclap), Older (>50), Pattern change/Positional/Papilledema.
- ✦Thunderclap 'worst headache of my life' = subarachnoid hemorrhage until ruled out.
- ✦Headache + fever + nuchal rigidity = meningitis.
- ✦New headache >50 with jaw claudication/visual change = temporal arteritis → urgent steroids to save vision.
- ✦A new/different/worst-ever headache is the trigger to escalate — don't just give analgesics.
Related Resources
Standards & sources
Fact-checked Jun 21, 2026This page is written to align with American Heart Association / American Stroke Association (AHA/ASA) · American Association of Neuroscience Nurses (AANN). It is an educational summary, not a citation of any single document — always verify specific doses, values, and protocols against current guidelines and your facility policy. How we source content →