Nausea and vomiting in pregnancy, often referred to as morning sickness, is a common condition affecting many pregnant individuals, particularly during the first trimester. It typically occurs due to hormonal changes, especially increased levels of human chorionic gonadotropin (hCG) and estrogen. Symptoms can vary in intensity and may occur at any time of the day. While most cases are mild and resolve by the second trimester, some individuals may experience more severe symptoms, known as hyperemesis gravidarum. This condition can lead to dehydration and weight loss, requiring medical attention. Treatment options include dietary changes, hydration, and, in some cases, medication.