This is considered to be an early pregnancy reaction such as nausea and vomiting, which usually occurs on the 40th day of pregnancy. In addition to these reactions, there are also reactions such as preferring to sleep, not wanting to eat or feeling full after eating very little. Pregnancy vomiting usually disappears naturally by about 12 weeks of pregnancy. As for the specific cause of vomiting during pregnancy, it is still uncertain, but it is generally believed to be related to the elevated blood HCG during pregnancy. Because the time of early pregnancy reactions such as nausea and vomiting and the time of HCG rise and fall in pregnant women’s body basically match, it is believed that there is a relationship between the two. Besides, these factors such as fear of pregnancy, mental tension, emotional instability, poor economic conditions and poor physical condition also make it easy for pregnancy vomiting to occur.