Preeclampsia, a narrowing of the blood vessels, is a dangerous condition unique to pregnancy. Because of this narrowing, women with preeclampsia can have decreased blood flow to the kidneys, brain, liver, retina, and placenta. Symptoms of preeclampsia include high blood pressure, swelling of the hands and face, and protein in the urine. Preeclampsia can cause fetal complications such as stillbirths, premature births, and low birth weight. Preeclampsia research scientists do not know the specific cause or causes of the condition. Its only definite cure is delivering the fetus.