I've had a close relative who recently died unexpectedly due to a brain haemorrhage. The symptoms were as plain as a blackout/dizziness (which I've experienced myself multiple times). The person was 67 and was perfectly healthy who underwent regular checkups. I'd like to know what can one do to prevent this from happening and recognize the symptoms as soon as possible. The person just slipped into coma (which just looks as if the person's in deep sleep) and none of us could even realize that something was so amiss. Also, could it be possible that there might be an undetected aneurysm that led to this?