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'''Bleeding''', also known as a '''hemorrhage''', '''haemorrhage''', or simply '''blood loss''', is [[blood]] escaping from the [[circulatory system]] from damaged [[blood vessel]]s.<ref>{{cite web|url=http://www.healthline.com/adamcontent/bleeding|title=Bleeding Health Article|publisher=Healthline|access-date=2007-06-18|archive-url=https://web.archive.org/web/20110210143239/http://www.healthline.com/adamcontent/bleeding|archive-date=2011-02-10|url-status=dead}}</ref><ref name="Roth 2011 pp. 1234–1235">{{cite book | last=Roth | first=Elliot J. | title=Encyclopedia of Clinical Neuropsychology | chapter=Hemorrhage | publisher=Springer New York | publication-place=New York, NY | year=2011 | doi=10.1007/978-0-387-79948-3_2178 | pages=1234–1235|quote=Hemorrhage is active bleeding, in which blood escapes from the blood vessels, either into the internal organs and tissues or outside of the body.
}}</ref> Bleeding can occur [[Internal bleeding|internally]], or externally either through a natural opening such as the [[Mouth (human)|mouth]], [[human nose|nose]], [[ear]], [[urethra]], [[vagina]] or [[anus]], or through a wound in the [[human skin|skin]].
[[Hypovolemia]] is a massive decrease in blood volume, and death by excessive loss of blood is referred to as [[exsanguination]].<ref>{{cite web|url=http://dictionary.reference.com/browse/exsanguination|title=Dictionary Definitions of Exsanguination|publisher=Reference.com|access-date=2007-06-18|archive-url=https://web.archive.org/web/20070711062056/http://dictionary.reference.com/browse/exsanguination|archive-date=2007-07-11|url-status=live}}</ref> Typically, a healthy person can endure a loss of 10–15% of the total blood volume without serious [[sequela|medical difficulties]] (by comparison, [[blood donation]] typically takes 8–10% of the donor's blood volume).<ref>{{cite web|url=http://www.blood.co.uk/pages/b36faint.html|title=Blood Donation Information|publisher=UK National Blood Service|access-date=2007-06-18 |archive-url = https://web.archive.org/web/20070928035216/http://www.blood.co.uk/pages/b36faint.html <!-- Bot retrieved archive --> |archive-date = 2007-09-28}}</ref> The stopping or controlling of bleeding is called [[hemostasis]] and is an important part of both [[first aid]] and [[surgery]].