"Sub-arachnoid haemorrhage (SAH) usually occurs without any prior warning and is therefore commonly a shock to the patient and their family. Many people have anxieties during the illness and recovery periods and lots of questions”.

SAH can result from head trauma, the most common cause, or may occur spontaneously. Spontaneous SAH most commonly follows the rupture of a cerebral aneurysm or cerebral arteriovenous malformation, but can also be due to angioma, thrombosis, hematoma, or brain tumor.