The hazards of vomiting yellow water during pregnancy are mainly electrolyte disorders and malnutrition affecting fetal development. The yellow water vomiting during pregnancy is a normal physiological phenomenon, usually caused by the early pregnancy reaction, vomiting may be serious bile are vomited out, the phenomenon of yellow water vomiting will occur. 1, electrolyte disorders: pregnant women vomiting yellow water may cause electrolyte disorders in the body, resulting in weakness, nausea and even coma and other symptoms. The vomiting phenomenon will gradually improve after the electrolyte level is balanced. 2, malnutrition affects fetal development: bile vomiting will affect the absorption of fat, severe vomiting will also make the pregnant woman’s appetite decline, affecting the feeding, so that the intake of various nutrients is insufficient to affect the growth and development of the fetus, so that the fetal growth is limited. Pregnant women should be encouraged to eat less and more meals, drink warm water, eat some nutritious food, and eat a diversified diet, which can reduce the early pregnancy reaction and supplement maternal nutrition, and the phenomenon of vomiting yellow water will be alleviated, which is beneficial to the growth and development of the fetus.