Neither of the above
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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