Sophia Smith on Instagram: "Why do pregnant women experience morning sickness?#shortsvideo Morning sickness, medically known as nausea and vomiting during pregnancy, is one of the most common symptoms in early pregnancy. The medical community generally believes it is the result of multiple factors, not a single cause. The main cause is the rapid change in hormone levels. Human chorionic gonadotropin (hCG): This hormone is secreted by the placenta after conception, and its levels rise rapidly. Th