The miscarriage may act according to its clinical manifestation to divide into the threatened miscarriage, the inevitable abortion, not the entire miscarriage, to miscarry, the missed abortion, routine to miscarry completely, the septic abortion. 流产可根据其临床表现分为先兆流产、难免流产、不全流产、完全流产、稽留流产、习惯性流产、流产感染。