Preeclampsia is a serious blood pressure condition that develops during pregnancy after 20 weeks. It can cause organ damage, premature birth and other complications for you and the fetus. Learn how to prevent, diagnose and treat preeclampsia. Pre-eclampsia is a hypertensive syndrome that occurs in pregnant women, most often after 20 weeks' gestation, which consists of new-onset, persistent hypertension with either proteinuria or evidence of systemic involvement. All pregnant women presenting with hypertension and either proteinuria or... Preeclampsia is when you have high blood pressure and protein in your urine during pregnancy or after delivery. Learn about symptoms, treatment, and more. Preeclampsia is persistent high blood pressure that develops during pregnancy or the postpartum period and is often associated with high levels of protein in the urine OR the new development of decreased blood platelets, trouble with the kidneys or liver, fluid in the lungs, or signs of brain trouble such as seizures and/or visual disturbances.