Headache
🚨 Life-Threatening — exclude first
If suspected, escalate now.
Subarachnoid Haemorrhage
Meningitis / Encephalitis
Raised Intracranial Pressure
Temporal Arteritis
Acute Angle-Closure Glaucoma
🚨
Dangerous Causes Causes
Subarachnoid HaemorrhageMeningitisEncephalitisRaised ICP / space-occupying lesionTemporal ArteritisAcute Angle-Closure GlaucomaVenous Sinus Thrombosis
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Neurological Causes
MigraineCluster HeadacheTension HeadacheMedication-Overuse Headache
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Infectious Causes
Viral IllnessSinusitisMeningitis
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Vascular Causes
SAHIschaemic StrokeTemporal ArteritisHypertensive Emergency