The official term for a nosebleed is epistaxis, and there are two kinds of them.

流鼻血的官方术语是鼻出血，有两种。

The most common type is anterior epistaxis where blood vessels from a group inside your nostrils rupture, and usually it only involves one nostril.

最常见的类型是前鼻出血，鼻孔内的一组血管破裂，通常只累及一个鼻孔。