Preeclampsia, eclampsia and HELLP syndrome are disorders that occur only during pregnancy and the postpartum period, which affect both the mother and the unborn baby. Preeclampsia affects at least 5 percent of all pregnancies, it is a rapidly progressive condition characterized by high blood pressure, swelling and protein in the urine. Sudden weight gain, headaches and changes in vision are important symptoms; however, some women with rapidly advancing disease report few symptoms.