Preeclampsia is persistent high blood pressure and other problems in people who are pregnant or who have recently given birth. It can threaten the life of mother and baby, and requires prompt diagnosis and treatment. Learn more about preeclampsia, its risk factors, complications and prevention. 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. Preeclampsia is either new high blood pressure or worsening of existing high blood pressure that develops after the 20th week of pregnancy and is accompanied by excess protein in the urine. Eclampsia is seizures that occur in women with preeclampsia and that have no other cause. 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.