**1. Introduction**

Epistaxis occur due to trauma, disorders in mucosa or vessels, or coagulopathy. It is a very common disease, as 10% of all population experience severe epistaxis, about 30% of children aged 0~5, 56% of children aged 6~10 and 64% of children aged 11~15 are reported to experience one or more episode of epistaxis. (Cho, 2009 )

Although most cases of epistaxis are mild, that can be self-managed, life-threatening condition can be also possible. When encounter patient with severe epistaxis, it is important to find the bleeding focus and to analyse the causes of epistaxis fast and accurately, to treat the patient promptly to avoid complications such as hypotension, hypoxia, anemia, aspiration or death.
