Preeclampsia is a pregnancy complication characterized by high blood pressure and signs of damage to other organ systems, often the kidneys. It typically occurs after the 20th week of pregnancy and can affect both the mother and the baby. Symptoms may include swelling, sudden weight gain, headaches, and changes in vision. If left untreated, preeclampsia can lead to serious complications, such as eclampsia, which involves seizures, or HELLP syndrome, a severe form of the condition. Regular prenatal check-ups are essential for early detection and management to ensure the health of both the mother and the baby.