Pregnancy sickness is usually associated with changes in hormone levels in the body, and some pregnant women experience pregnancy sickness associated with psychosomatic factors. The reaction to pregnancy vomiting usually occurs in the second to third month of pregnancy, when the placenta secretes a large amount of human chorionic gonadotropin, or HCG, which will cause the mother to produce digestive discomfort, such as nausea, loss of appetite, vomiting, etc., which is also the process of the mother’s continuous adaptation to the fetus. Generally speaking, after the third month of pregnancy, the level of human chorionic gonadotropin in the body decreases and tends to stabilize, and the reaction of pregnant mothers to pregnancy vomiting will gradually reduce, or even disappear. A small number of pregnant women have prolonged vomiting, which, in addition to changes in hormone levels, may be related to factors such as individual psychological oversensitivity and excessive mental stress after pregnancy. In this case, it is recommended to provide necessary psychological counseling to pregnant women. The reaction of pregnancy is most obvious in 8-12 weeks of pregnancy, and gradually reduces or even subsides after 12 weeks, and the emergence of the reaction of pregnancy vomiting is closely related to the change of HCG level. If the vomiting is not particularly severe, there is no need for medical treatment.