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nosebleed
Epistaxis (from ''epistazo'', "to bleed from the nose" from ''epi'', "above, over" and ''stazo'', "to drip (the nostrils )") or a nosebleed is the relatively common occurrence of hemorrhage from the nose, usually noticed when the blood drains out through the nostrils. There are two types: anterior (the most common), and posterior (less common, more likely to require medical attention). Sometimes in more severe cases, the blood can come up the nasolacrimal duct and out from the eye. Fresh blood and clotted blood can also flow down into the stomach and cause nausea and vomiting.〔()〕
Although the sight of large amounts of blood can be alarming and may warrant medical attention, nosebleeds are rarely fatal, accounting for only 4 of the 2.4 million deaths in the U.S. in 1999.〔( Work Table I. Deaths from each cause by 5-year age groups, race and sex: US, 1999 ) Page 1922. U.S. Centers for Disease Control Published 2001-05-11.〕
== Cause ==
The causes of nosebleeds can generally be divided into two categories, local and systemic factors, although a significant number of nosebleeds occur with no obvious cause.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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