Pregnant women vomiting yellow water is vomiting serious, the stomach contents or bile out of the state, is generally a normal physiological phenomenon, but there may be pathological liver or digestive tract disease, pay attention to distinguish judgment, diet to eat less and more, nutritious, timely rehydration if serious. 1, physiological factors: generally is the normal physiological response to pregnancy, the symptoms of the digestive tract is the main. Pregnant women vomit yellow water is due to the reduction of gastric acid secretion in the body after pregnancy, heavy nausea, vomiting often causes difficulties in eating. Bile is continuously secreted into the stomach, so that the gastric juice will be mixed with bile, which is often yellow, and when vomiting, yellow water will be vomited, which usually disappears in the third month of pregnancy. In late pregnancy, it is considered to be caused by the increased pressure of the uterus on the bottom of the stomach, so that the emptying function of the stomach is blocked. 2, pathological factors: there may be hepatobiliary surgical diseases or gastrointestinal diseases, such as acute gastritis, acute cholecystitis, acute pancreatitis, or food poisoning, eating food containing toxins irritating, may also lead to pregnant women vomiting yellow water. It is important to go to the hospital in time to find out the cause. It is recommended to pay attention to eating less and more meals, eating a light diet, eating food that is easy to digest and absorb, and eating more vegetables and fruits rich in vitamins. Replenish nutrition, avoid serious vomiting leading to water-electrolyte balance imbalance, medical and surgical diseases also need to be actively dealt with, early detection and early treatment.