What is high blood pressure? What is preeclampsia? How are they related? High blood pressure When you have high blood pressure, or hypertension, the force of blood against your artery walls is too hypertension of pregnancy." Although mild high blood pressure during pregnancy is not necessarily dangerous If you develop high blood pressure during pregnancy, there is no way NHLBI Home. High Blood Pressure in Pregnancy. What Is High Blood Pressure? Blood pressure is the amount of force exerted by the blood against the walls of the arteries. What Are the Effects of High Blood Pressure in Pregnancy? Although many pregnant Common Are High Blood Pressure and Preeclampsia in Pregnancy? High blood pressure problems occur in Up to 5 percent of women have high blood pressure before pregnancy. Another 5 to 8 percent develop hypertension during pregnancy. This is called gestational hypertension, which usually goes away soon after delivery. High Blood Pressure During Pregnancy. Blood pressure is the force of the blood pushing against the walls of women who develop high blood pressure in pregnancy are monitored closely. Up to 5 percent of women have high blood pressure before pregnancy. Another 5 to 8 percent develop hypertension during pregnancy. This is called gestational hypertension, which usually goes away soon after delivery. High Blood Pressure During Pregnancy. Blood pressure is the force of the blood pushing against the walls of women who develop high blood pressure in pregnancy are monitored closely. Up to 5 percent of women have high blood pressure before pregnancy. Another 5 to 8 percent develop hypertension during pregnancy. This is called gestational hypertension, which usually goes away soon after delivery. High Blood Pressure During Pregnancy. Blood pressure is the force of the blood pushing against the walls of women who develop high blood pressure in pregnancy are monitored closely.