Why does threatened miscarriage occur?

Why does threatened miscarriage occur? During pregnancy, many women have no experience and are afraid of any abnormal symptoms so they are very careful, but threatened miscarriage still occurs, which makes them very puzzled. In fact, this is because there are many causes of threatened miscarriage, so let me introduce them to you in detail below.

1. Uterine malformation

If the expectant mother has uterine malformation (such as bicornuate uterus, uterine septum and uterine hypoplasia), it will affect embryo implantation and development and lead to miscarriage; loose uterine os or deep cervical lacerations will cause premature rupture of membranes and late miscarriage. The first pregnancy check-up is particularly important, because usually in the first pregnancy check-up, the gynecological speculum can be used to check the vagina and cervix of the expectant mother and rule out the possibility of abnormal development of the expectant mother's reproductive organs. If abnormalities are found, the expectant mother should follow the doctor's advice and deal with it as soon as possible. Otherwise, if the miscarriage is passive, the physical damage to the expectant mother will be greater.

2. Endocrine abnormalities

The fetus mainly absorbs nutrients from the mother through the placenta. If the placenta is underdeveloped or has a disease, the fetus will stop growing due to lack of nutrients, causing miscarriage. Endocrine abnormalities can seriously affect the placenta: insufficient corpus luteum function often affects the decidua and placenta, causing miscarriage; insufficient progesterone secretion can cause uterine decidua to develop poorly, thereby affecting the development of the fertilized egg and causing miscarriage; increased prostaglandins can cause frequent contractions of uterine muscles, which can also lead to miscarriage; hypothyroidism can hinder the cellular oxidation capacity, thereby affecting the growth and development of the embryo and causing miscarriage.

3. History of induced abortion or miscarriage

The incidence of miscarriage will increase 10 times for expectant mothers who have a history of induced abortion. The more times of induced abortion, the greater the possibility of miscarriage in the future pregnancy; the incidence of miscarriage will also increase for those who have a history of artificial abortion, intrauterine contraceptives and oral contraceptives. Doctors usually recommend that you wait at least one and a half years after an abortion before preparing for pregnancy, and at least one year after a medical abortion before getting pregnant. If you take long-acting oral contraceptives, you should stop taking them for 3 to 6 months before planning to get pregnant. After stopping taking short-acting oral contraceptives, you need to resume menstruation before you can get pregnant.

4. Father Factor

Abnormal fertilized eggs are the main cause of early miscarriage. A large part of miscarriages in the first two months of pregnancy are due to defects in sperm and eggs, which cause the embryo to terminate at a certain level. Relevant studies have shown that about 10% of expectant fathers have a certain amount of bacteria in their semen, which may affect embryo development and eventually lead to miscarriage. Oligospermia is caused by a small number of sperm, which means fewer chances of meeting the egg; sperm abnormalities are manifested in some way as abnormal genetic material in sperm, such as large-headed sperm are mostly diploid sperm, diploid sperm conceives, and the embryo is polyploid, thus causing miscarriage.

5. Accidental Injury

During pregnancy, especially in the early stages of pregnancy, if the expectant mother is hit, squeezed, falls, participates in heavy physical labor, does intense sports, undergoes abdominal surgery or has appendicitis, it can also cause uterine contractions and lead to miscarriage. Excessive tension, anxiety, fear, sadness and other mental trauma can also cause uterine contractions and lead to miscarriage. The expectant mother's family should pay special attention. If a relative or friend dies during pregnancy, the family should try to comfort the expectant mother and use other things to divert the expectant mother's attention in time to prevent her from being overly sad and causing miscarriage.

6. Bad habits

If an expectant mother is an alcoholic, ethanol will directly harm the fetus and interfere with the blood circulation of the placenta and fetus, leading to fetal death and miscarriage. Heavy smoking (including passive smoking) will reduce blood flow to the placenta and cause complex changes in hormone levels in the body. Both can lead to intrauterine growth retardation or miscarriage of the fetus.

We all know the causes of threatened abortion. After pregnancy, we should go to the hospital regularly for detailed examinations to avoid the occurrence of threatened abortion. Patients with weaker constitutions must be very careful in their lives, try not to do housework, and do not walk around casually. Many patients with weak constitutions suffer from threatened abortion.