What is the cause of pregnancy vomiting? Nausea and vomiting can occur during pregnancy, which is called Morning Sickness in English, but in fact pregnancy vomiting can occur at any time of the day, not just in the morning. About 50% of pregnant women develop nausea and vomiting, and about 30% develop nausea without vomiting. The cause of vomiting during pregnancy is unclear and may be related to hormone changes during pregnancy. In rare cases, severe or persistent nausea or vomiting may also be caused by thyroid, liver diseases, urinary tract infections and other problems unrelated to pregnancy. When did pregnancy vomiting occur in what? Most pregnant women have mild symptoms of pregnancy vomiting, usually occurring in the first pregnancy Read More …