Thunderclap headache

Recurrent subarachnoid haemorrhage

“…All patients presenting with a sudden onset headache, maximal at onset or within a few minutes and lasting longer than an hour, should be considered as subarachnoid haemorrhage (SAH) until proven otherwise. Only investigations can reliably differentiate benign primary causes from less benign secondary causes; the most appropriate firstline investigation is a CT scan of the head, as well as baseline blood tests 1. If this confirms SAH, then ideally one should proceed directly to CT angiography to identify any underlying vascular abnormality.…”