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Differential diagnosis: Acute headache

Primary

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Secondary – intracranial

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Other secondary intracranial differentials = encephalitis, cerebral abscess, tumour, pituitary apoplexy, subdural haematoma, extradural haematoma, spontaneous intracranial hypotension, reversible cerebral vasoconstriction syndrome, carotid/vertebral artery dissection

Secondary – extracranial

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Other secondary extracranial differentials = drugs (e.g. nitrates, PPI, Ca2+ antagonists, caffeine, analgesia overuse, hormones), drug withdrawal, carbon monoxide poisoning, post-traumatic, Paget’s disease, hypoxia, cervical spondylosis, otitis media, dental causes

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