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Authoring team

A headache, in the absence of localising signs, absence of fever, absence of papilloedema and with a normal level of consciousness, may be caused by:

  • tension headache
  • migraine
  • subarachnoid haemorrhage
  • drugs:
    • nitrate vasodilators
    • calcium antagonists
  • poisons e.g. carbon monoxide
  • hyponatraemia
  • thunderclap headache
  • coitus cephalgia
  • temporal arteritis

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