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.
Medical Definition of HORIZONTAL. 1. : relating to or being a transverse plane or section of the body. 2. : relating to or being transmission (as of a disease) by physical contact or proximity in contrast with inheritanceâcompare vertical.ull Definition of HORIZONTAL. 1. a: of, relating to, or situated near the horizon. 2. â horizontal noun. â horÂ·iÂ·zonÂ·talÂ·iÂ·ty \-Ëzaen-ËzÃ¤n-Ëta-lÉ\ tÄ. â nounÂ·horÂ·iÂ·zonÂ·tal \-ly-Ëzaen-ËzÃ¤n\ tÉl. Ä adverb see horizontal Defined-for english. Language learners see horizontal defined. for kids