Attacks with a sudden or sub-acute onset occurring in repeated short bursts with pain-free intervals lasting weeks or months arc characteristic of migraine, trigeminal neuralgia and cluster headache. Migraine attacks are often cyclical, occurring weekly or monthly, and are frequently peri-menstrual in women. In between attacks, the migraine sufferer is usually well. Post-herpettc neuralgia and cranial arteritis have a subacute onset but are continuous, and meningitis and subarachnoid haemorrhage have an acute onset w ith rapid progression.
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