After the patient is pregnant with the following behaviors are prone to miscarriage: first, after pregnancy, frequent sex, and sex is stronger, especially easy to lead to miscarriage. Because of the mechanical stimulation of sexual life is easy to cause uterine contraction, in addition to frequent sexual life is easy to lead to female vaginal flora imbalance, triggering infection. If the infection caused by the uterine cavity infection, it is likely to lead to miscarriage. Secondly, after pregnancy, if the patient carries out strenuous activities, such as running, jumping rope, or lifting heavy objects, or the patient has habitual constipation and chronic cough. These activities and diseases may increase the woman’s abdominal pressure, causing uterine contractions and leading to miscarriage. Third, the patient does not pay attention to the protection of the body after pregnancy, if there is a viral cold or take drugs that are easy to cause fetal malformation or kill the embryonic activity, may cause miscarriage.