Hyperemesis gravidarum does not necessarily occur in the second child born by cesarean section, but there is an increased risk of recurrence. Hyperemesis gravidarum refers to high blood pressure during pregnancy and is a serious pregnancy complication that is harmful to mother and baby. When the diagnosis is clear during pregnancy it is important to strengthen the management of pregnancy, follow the doctor’s instructions to pay attention to rest, monitor the changes in blood pressure, and need antihypertensive treatment if necessary. When a pregnant woman’s first pregnancy is complicated by gestational hypertension, the risk of hyperemesis gravidarum in another pregnancy is also high, and can be prevented in advance under the guidance of a doctor. Have gestational hypertension pregnancy history of women, another pregnancy, can follow the medical advice in pregnancy 11 ~ 13 + 6 weeks or so, take a small dose of aspirin, but also pay attention to appropriate rest, to ensure adequate sleep, to ensure that the intake of adequate protein and calories, such as meat, eggs, poultry, etc., dynamic monitoring of blood pressure changes, if necessary under the guidance of the doctor labetalol and other medications to lower blood pressure treatment. Therefore hyperemesis gravidarum cesarean section of the second child does not necessarily suffer from hyperemesis gravidarum, but the risk of reoccurrence will increase, we need to do a good job of counseling before preparing for pregnancy, active prevention.