The judgment of which is scarier, primary hypertension or secondary hypertension in pregnancy, is not absolute. Both conditions are considered hypertensive disorders in pregnancy, which are relatively more dangerous and need to be evaluated by obstetricians and cardiologists before pregnancy. If left uncontrolled and untreated during pregnancy, it may have adverse effects on the mother and the fetus. Hypertensive disorders in pregnancy have a serious impact on the health of the mother and child and are a major cause of increased maternal and perinatal morbidity and mortality. Such diseases can reduce blood perfusion to all organs and systems of the body, thus causing harm to the mother and child. Combined hypertensive disorders of pregnancy may cause adverse effects such as cerebral edema, cerebral hemorrhage, renal failure, elevated serum aminotransferases, anemia, hemolysis, fetal distress, and placental abruption. Both primary hypertension in pregnancy and secondary hypertension in pregnancy are hypertensive disorders in pregnancy and can cause the above mentioned hazards; the degree of risk cannot be compared between the two. During pregnancy, it is necessary to evaluate the condition of the mother and child in conjunction with many indicators during pregnancy, such as blood pressure, blood routine, liver function, renal function, fetal development, etc. It is necessary to closely monitor and control blood pressure during pregnancy, pay close attention to the intrauterine development of the fetus, and deal with the problem in time when it is detected.