Pre-eclampsia is a syndrome which can present from 20 weeks of pregnancy, probably due to an alteration in the maternal uteroplacental blood flow. This is one of the main causes of maternal and perinatal morbidity and mortality. Early detection of pre-eclampsia is key for the survival of the mother and the foetus. Pre-eclampsia is a serious complication which occurs in 3-5% of pregnancies. Sometimes pre-eclampsia does not cause symptoms, high blood pressure can appear suddenly or slowly. Women with chronic hypertension and existing conditions before pregnancy require special medical supervision and follow-up.