Pregnant women vomiting yellow water in the morning is a kind of pregnancy reaction, this situation may be a heavy reaction, especially in the morning when there is no food in the stomach when fasting, the bile in the stomach is easy to vomit, so it will be expressed as yellow liquid. At this time, if you can eat, try to eat a liquid diet. If you cannot eat and vomit right after eating, it means that you have severe pregnancy vomiting, and you need to go to the hospital for fluid treatment in time. This may cause water and electrolyte disorders over time and dehydration in pregnant women, which will have a great impact on the body and affect the development of the fetus. If the vomiting phenomenon is significantly reduced after eating, it can be observed for the time being, and the pregnancy reaction will gradually reduce or disappear after about 20 days to 1 month.