1 If a lot of blood leaks out, it can cause a buildup of pressure in the brain because the brain is enclosed in the skull. There is no room for brain tissue to expand, and so the leaked blood can compress and kill important areas of the brain.  Hemorrhagic strokes tend to be more serious than ischemic strokes.
Horizontal definition, at right angles to the vertical; parallel to level ground. See more.
Vertical is up and down and horizontal is side to side. Think of the horizon, it is a line and horizontal has the same root. In fact, one definition of horizontal is parallâ¦el to or in the plane of the horizon.