Red flags in headache

Red Flags in Headache - SNOOPy's on the Case

📌 SNOOPy mnemonic for serious underlying causes:

• Systemic symptoms: Fever, weight loss, history of malignancy.
• Neurologic signs: Focal deficits, papilledema, altered mental status.
• Onset: Sudden, abrupt, "thunderclap" headache (peaks within 1 minute).
• Older age: New headache in a patient > 50 years (risk of giant cell arteritis).
• Pattern change: Change in frequency, severity, or clinical features.
• yardstick: Precipitated by Valsalva maneuver (coughing, sneezing), suggesting ↑ ICP.

⭐ A thunderclap headache requires immediate investigation for subarachnoid hemorrhage (SAH), typically starting with a non-contrast head CT.

SNOOP Mnemonic - The Red Flag Framework

📌 SNOOP helps identify secondary causes of headache requiring urgent investigation.

• Systemic Symptoms or Secondary Risk Factors:
  • Fever, chills, night sweats, weight loss
  • History of malignancy, HIV, or immunosuppression
• Neurologic Signs or Symptoms:
  • Focal neurologic deficits (e.g., weakness, sensory loss)
  • Papilledema, cranial nerve palsies
  • Altered mental status or seizures
• Onset:
  • Sudden, abrupt, or "thunderclap" onset (peak intensity < 1 minute)
• Older Age of Onset:
  • New headache onset after age 50
• Pattern Change:
  • Progressive headache with ↑ frequency or severity
  • Change in attack characteristics or quality

⭐ A "thunderclap headache" is a classic presentation of subarachnoid hemorrhage (SAH) and warrants immediate neuroimaging (non-contrast head CT).

Neurologic Signs - Alarming Exam Findings

• Papilledema:
  • Optic disc swelling with blurred margins on fundoscopy.
  • A key sign of ↑ intracranial pressure (ICP).
  • Mandates urgent neuroimaging (CT/MRI) to investigate for mass lesions, hydrocephalus, or cerebral venous thrombosis.
• Focal Neurological Deficits (FNDs):
  • New, objective weakness, sensory loss, reflex changes (e.g., Babinski sign), or coordination difficulties (e.g., ataxia).
  • Suggests a structural brain lesion (e.g., stroke, tumor, abscess).
• Altered Mental Status (AMS):
  • Confusion, drowsiness, lethargy, or a decline in consciousness (Glasgow Coma Scale < 15).
  • Indicates diffuse brain dysfunction or impending herniation.

⭐ A unilateral, fixed, and dilated pupil ("blown pupil") suggests compression of the oculomotor nerve (CN III), often from uncal herniation-a neurosurgical emergency.

Onset & History - Timing is Everything

• "Worst headache of life": A classic red flag, demanding immediate attention.
• Thunderclap Onset: ⚠️ Reaches maximum intensity in < 1 minute.
  • Strongly suggests Subarachnoid Hemorrhage (SAH).
  • Requires emergent non-contrast head CT.
• Concerning Temporal Patterns:
  • New-onset headache in patients > 50 years (risk for Giant Cell Arteritis).
  • Headache that progressively worsens or changes character.
  • Precipitated by Valsalva (coughing, bending) or exertion; suggests ↑ ICP.
  • Wakes a patient from sleep.

⭐ If an initial non-contrast head CT is negative in a patient with a thunderclap headache, a lumbar puncture is mandatory to rule out SAH by checking for xanthochromia.

High-Yield Points - ⚡ Biggest Takeaways

• "Worst headache of life" is a classic sign of subarachnoid hemorrhage (SAH).
• New-onset headache in patients >50 should raise suspicion for giant cell arteritis.
• Fever and nuchal rigidity accompanying a headache strongly suggest meningitis.
• Focal neurologic deficits or seizures point to a structural brain lesion like a tumor or abscess.
• Papilledema on exam indicates increased intracranial pressure (ICP).
• Headaches that worsen with exertion or are positional also suggest ↑ ICP.