Why do nausea and vomiting symptoms occur in early pregnancy? Pregnancy is a very special thing that brings endless happiness and joy to the mother, but it is also accompanied by many discomforts and symptoms. Among them, early pregnancy reaction is also widely accepted as one of the common conditions in early pregnancy. Many pregnant women experience nausea and vomiting, and these symptoms are often severe and affect the mother\’s daily life. So, what exactly causes this phenomenon? This article will elaborate on it from many aspects. hormones