What causes a Subarachnoid Haemorrhage?
Fortunately, not every berry aneurysm ruptures – only about one in 7,000 people have a subarachnoid haemorrhage; not every brain haemorrhage is due to a berry aneurysm. Although about 70 per cent of subarachnoid haemorrhages are caused this way. Also, not every stroke is due to a haemorrhage – the majority are caused by blockages of the blood supply by a clot or atherosclerosis. Other possible explanations are due to a traumatic head injury or high blood pressure.
