先天性宫颈内口松弛为每次妊娠都有会发生早产或流产;而后天性子宫内口松弛症则表现为发生早产或流产的时间越来越早，或刚开始可正常妊娠分娩，而后因某种原因出现早产或流产。往因此破水而流产。

The patient with congenital cervical relaxation will have premature delivery or miscarriage in every pregnancy; and the manifestation of acquired cervical relaxation are premature delivery or miscarriage in every pregnancy occur earlier and earlier, or the patient can have normal pregnancy and delivery at the beginning, but for some reason premature delivery or miscarriage happened later. 

宫颈短，是宫颈松弛扩张的前奏，不及时埋箍，就会发展到宫口松开，胎膜早破，难免流产。

The shortness of cervix is the intrada of cervical relaxation and dilation, it’s hard to avoid miscarriage and premature rupture of membranes if the coil was not embedded in time.