Vomiting yellowish bitter water may be caused by dietary indiscretion, or it may be related to digestive system diseases. 1. Dietary indiscretion: after alcoholism or overeating cold and stimulating food, the function of the gastrointestinal tract will be impaired and the gastric mucosa will be irritated, causing violent vomiting. When the stomach is emptied, it will produce reverse suction on bile, which will reflux into the stomach, resulting in vomiting yellow bitter water. 2. Digestive system diseases: cholecystitis, gallstones and other digestive system diseases, may lead to bile reflux, the stomach contents and bile vomiting, bile color yellow, vomit will show yellow bitter water. In addition to the above reasons, the early reaction of pregnancy, food poisoning, cranial hypertension and angina pectoris may vomit yellow bitter water. It is recommended to consult a doctor in time to identify the cause of the disease and treat it accordingly, do not take medication on your own to avoid delaying your condition.