怀孕20周+5导致流产的原因都有哪些?What are the causes of miscarriage caused by pregnancy 20 weeks + 5?

前几天9.17号难免性流产，怀孕20周+5，说是宫颈机能不全，我想问下引发流产的原因还有哪些?

A few days ago 9.17 inevitable miscarriage, pregnancy 20 weeks +5, said that the cervical function is incomplete, I would like to ask what causes of abortion?

陈凤林教授指出：关于怀孕第五个月流产病因多与以下因素有关，需一一排查，孕前治疗更安全!

Professor Chen Fenglin pointed out that the causes of spontaneous miscarriage in the fifth month of pregnancy are mostly related to the following factors, which need to be investigated one by one. Pre-pregnancy treatment is safer!

1.宫颈因素：如宫颈裂伤，宫颈松弛(宫颈机能不全)导致的流产。

1. Cervical factors: such as cervical laceration, cervical relaxation (cervical dysfunction) caused by miscarriage.

2.胎盘因素：如胎盘前置，胎盘发育不良等导致的流产。

2. Placental factors: such as placenta previa, placental dysplasia and other causes of miscarriage.

3.生殖系统形态异常：若为单角子宫、双角子宫、双子宫、子宫纵隔等畸形。

3. Morphological abnormalities of the reproductive system: if it is unilateral uterus, BIANGULAR uterus, double uterus, uterine septum and other deformities.

4.创伤刺激因素：宫腔粘连、子宫创伤的手术、性交过度、外力撞击等。

4. Traumatic stimulating factors: intrauterine adhesions, uterine trauma surgery, excessive sexual intercourse, external force impact, etc.

5.母体自身疾病：如流感病毒、急性支原体衣原体感染，高血压、肾病、心脏病，免疫等疾病

5. Maternal systemic infectious diseases: such as influenza virus, acute Mycoplasma Chlamydia infection, hypertension, nephropathy, heart disease, immunity and other diseases