The specific cause of pregnancy vomiting is unknown, but it is related to the following factors: i. The time of appearance and disappearance of early pregnancy vomiting is consistent with the time of rise and fall of HCG level in pregnant women’s blood, suggesting that severe pregnancy vomiting may be related to the rise of HCG level; ii. The severity of vomiting in some pregnant women is significantly correlated with free thyroid hormone; iii. Pregnant women in poorer conditions are also prone to severe pregnancy vomiting. When pregnant women experience pregnancy vomiting, it is recommended to eat less and more meals, eat light, easy to digest food, nausea, vomiting is serious, you can take oral vitamin B6 to stop vomiting, water-electrolyte disorders to correct timely rehydration.