Gestational hypertension, also known as pregnancy-induced hypertension, typically arises after the 20th week of pregnancy and is characterized by high blood pressure. The exact cause is not fully understood, but it is believed to stem from issues with the placenta, which supplies oxygen and nutrients to the growing fetus. Factors such as insufficient blood flow to the placenta, damage to blood vessels, and inflammation may contribute to the development of gestational hypertension. Additionally, pre-existing conditions like obesity, diabetes, and certain kidney diseases can increase the risk.