Hypertensive disorders of pregnancy are an important cause of severe morbidity, long-term disability and death among both mothers and their babies. The majority of deaths due to pre-eclampsia and eclampsia are avoidable through the provision of timely and effective care to the women presenting with these complications. Optimizing health care to prevent and treat women with hypertensive disorders is a necessary step towards achieving the Millennium Development Goals. This chapter covers the physiological changes in blood pressure during pregnancy, classification of hypertensive disorders during pregnancy, and timing of delivery of women with pre-eclampsia/eclampsia. The womb actually is the best neonatal intensive care unit but in certain few conditions the uterine environment is not beneficial for the baby or maternal condition is such that it would be hazardous for the pregnancy to carry on and delivery is then expedited. It is the gestational age which has the maximum impact on the outcome of the baby more than any other various measurements.