What are the symptoms/dangers of pre-clampsia?

Preeclampsia: Preeclampsia is the disorder of late pregnancy manifested by elevated blood pressure, increased excretion of urinary protein, and/or edema. There are other optional manifestations such as elevated liver enzymes. Preeclampsia, if left untreated, will progress to eclampsia, the hallmark thereof, is seizures. It's very important that pre-eclampsia be identified and treated promptly.