Pregnant, why vomit?

Pregnancy vomiting is a normal reaction in early pregnancy, may be related to the increase of human chorionic gonadotropin in the mother during pregnancy. After pregnancy, the placenta will secrete human chorionic gonadotropin, which is often said to be HCG. When the hormone secretion increases, it will cause gastric acid secretion to decrease, gastric motility to slow down, so that water and food are stored in the stomach, which is easy to cause vomiting. In addition, in the early stages of pregnancy, the excitability of the cerebral cortex of pregnant women is reduced, and the inhibition of the central nervous system under sebum is weakened, resulting in autonomic nervous dysfunction and vomiting.