Pre-eclampsia is an abnormality in the course of pregnancy and refers to the appearance of the aura of miscarriage before the 28th week of pregnancy, including a small amount of vaginal bleeding and the appearance of paroxysmal abdominal pain or low back pain. Patients often discharge dark red or bloody leucorrhea, which may last for 4-5 days or even more than a week, without the discharge of pregnancy. If the clinical symptoms disappear after rest or treatment, the pregnancy may continue. If the vaginal bleeding increases or the abdominal pain worsens, it may develop into an inevitable miscarriage at a later stage. The cause of preterm abortion is premature contraction of the uterus. Hormonal disorders in women, infections, exertion, uterine diseases, and psychological factors may lead to premature contraction of the uterus and signs of miscarriage. In case of systemic infection, high fever can induce uterine contraction and cause miscarriage; certain known pathogenic infections such as toxoplasma, herpes simplex, mycoplasma, cytomegalovirus, etc. are associated with miscarriage; ischemic and hypoxic diseases such as heart failure, severe anemia, hypertension, chronic nephritis and severe malnutrition can also cause miscarriage. When the abdomen is squeezed and hit, it can also lead to miscarriage. A common cause of preterm miscarriage is exposure to adverse factors in the environment, such as formaldehyde, benzene, lead and other harmful chemicals. Therefore, avoiding the above-mentioned causes can reduce the probability of preterm abortion. Once a pregnant woman shows signs of mild preterm abortion, she should pay attention to rest, reduce activities, prohibit sexual intercourse, and do ultrasound to make sure the fetal heart is normal before carrying out fetal preservation treatment. Pregnant women also need to relax and avoid excessive mental tension. If the symptoms of pre-eclampsia are obvious and cannot be relieved after rest, or even aggravated, you need to go to the hospital in time, under the guidance of the doctor for necessary examinations, and follow the doctor’s instructions for medication, such as progesterone to ensure embryonic development, maintain pregnancy, inhibit uterine smooth muscle contraction, and reduce uterine tension.