Preeclampsia: Preeclampsia is a serious complication of pregnancy. Preeclampsia is associated with high blood pressure and protein in the urine. Preeclampsia is also referred to as toxemia, or toxemia of pregnancy. The cause of preeclampsia is unknown. Symptoms of preeclampsia are high blood pressure, decrease in urine output, edema of the hands and face, rapid weight gain, and nervous system changes. Treatment of preeclampsia depends on the gestation period of the baby and the associated medical conditions of the mother.