Preeclampsia, pree uh KLAMP see uh, is a serious condition that affects about 5 percent of pregnant women. Preeclampsia can interfere with growth of the fetus (unborn baby) and lead to premature birth. It may result in the death of the mother, her unborn baby, or both. Symptoms usually occur late in pregnancy. They include high blood pressure, excessive protein in the urine, and body swelling. Preeclampsia was formerly called toxemia of pregnancy.