MondayIL: Subarachnoid hemorrhage is most often caused by "berry" aneurysms. These are little berry-like bubbles that sometimes form around the junctions between the blood vessels of arteries in the circle of Willis in the brain. They weaken the vessel walls, much like if you poked into a balloon with your finger, causing a thinner, finger-shaped bubble to protrude from the otherwise normal balloon. If the balloon were ever going to pop, it'd pop in that thin bubble.
Hemorrhagic stroke often causes headache and lethargy, whereas an ischemic stroke does not.
Seizures can confusingly cause the symptoms of a stroke, like muscle weakness, in the hours and days post seizure.