Hemophilia is a condition in which blood does not clot well — it does not thicken and seal a cut the way most people’s blood does. A person with hemophilia can bleed for a long time from a small wound, and can also bleed inside joints and muscles, which is painful and damaging. It often runs in families, and it is much more common in boys and men, though girls can have it too.

HemophiliaHemophilia（血友病） is a condition in which blood does not clot well是一種血液凝結不良的疾病—— it does not thicken and seal a cut the way most people's blood does血不會像大多數人那樣變稠、把傷口封住。 A person with hemophilia can bleed for a long time from a small wound得了hemophilia的人，一個小傷口可能流血流很久， and can also bleed inside joints and muscles也可能在關節和肌肉裡面出血， which is painful and damaging既痛又會造成傷害。 It often runs in families這常常是家族遺傳， and it is much more common in boys and men而且在男孩和男性身上常見得多， though girls can have it too不過女生也可能得。

This is the American spelling; British English writes haemophilia.

This is the American spelling這是美式拼法； British English writes haemophilia英式英文寫成haemophilia。

Though actually, the ending -philia usually means a love of something, so the word looks as if it meant love of blood. It does not. Here the scientific naming only means the blood has a strong tendency toward bleeding.

Though actually不過其實， the ending -philia usually means a love of something字尾-philia通常表示對某樣東西的喜愛， so the word looks as if it meant love of blood所以這個字看起來好像是「愛血」。 It does not但不是這樣。 Here the scientific naming only means the blood has a strong tendency toward bleeding這裡的科學命名只是表示血液有很強的出血傾向。

Older English sometimes called it the royal disease, because it appeared in some European royal families, but the medical name is hemophilia.

Older English sometimes called it the royal disease早期的英文有時候叫它royal disease（皇室病）， because it appeared in some European royal families因為它出現在一些歐洲皇室家族裡， but the medical name is hemophilia但正式的醫學名稱是hemophilia。