Gestational Hypertension Pregnancy-induced hypertension is also called toxemia or preeclampsia. It occurs most often in young women with a first pregnancy. HELLP Syndrome HELLP syndrome is a serious complication of severe pregnancy-induced high blood pressure. It usually develops before delivery, but may also occur after delivery. Chronic Hypertension When a woman has pre-existing hypertension or develops hypertension before the 20th week of pregnancy, this is called chronic hypertension.