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{{about||the deliberate extraction of blood|Bloodletting|other uses}}
{{Infobox medical condition (new)
| image = Bleeding
| caption = A bleeding wound in the
| synonyms = Hemorrhaging,
| field = [[Emergency medicine]], [[hematology]]
| symptoms =
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'''Bleeding''', also known as a '''hemorrhage''' or '''haemorrhage''', 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|accessdate=2007-06-18|archive-url=https://web.archive.org/web/20110210143239/http://www.healthline.com/adamcontent/bleeding|archive-date=2011-02-10|dead-url=yes}}</ref> Bleeding can occur [[Internal bleeding|internally]], or externally either through a natural opening such
[[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|accessdate=2007-06-18}}</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|accessdate=2007-06-18 |archiveurl = https://web.archive.org/web/20070928035216/http://www.blood.co.uk/pages/b36faint.html <!-- Bot retrieved archive --> |archivedate = 2007-09-28}}</ref> The stopping or controlling of bleeding is called [[hemostasis]] and is an important part of both [[first aid]] and [[surgery]].
The use of [[Cyanoacrylate|cyanoacrylate glue]] to prevent bleeding and seal battle wounds was designed and first used in the [[Vietnam War]]. Today many medical treatments use a medical version of "super glue" instead of using traditional stitches used for small wounds that need to be closed at the skin level.
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