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'''Bleeding''', '''hemorrhage''', '''haemorrhage''' or '''blood loss'''
}}</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 puncture 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]].
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