Yellow and bitter water in the morning is due to the vomiting of bile. If the patient vomits, after all the contents of the stomach have been vomited out, he may then vomit up very bitter yellow water, which at this time is bile. Due to the change in gastrointestinal dynamics, bile refluxes into the stomach and is expelled from the body with vomiting. Try not to drink or eat during vomiting to avoid aggravating the symptoms. If the vomiting is severe, it can be treated with antiemetic drugs such as domperidone and metoclopramide tablets as prescribed by your doctor. After the symptoms are relieved, a small amount of water can be consumed, and the diet should be more fluid food, such as rice porridge and noodles which have the effect of nourishing the stomach, and can alleviate the stomach discomfort. In addition, patients are advised to develop good dietary habits, avoid overeating, and try not to drink alcohol, so as not to cause damage to the body. The above drugs are prohibited for those who are allergic to them and all should be taken as prescribed by the doctor. If the patient’s vomiting symptoms are serious, or persist without improvement, it is recommended to go to the hospital in a timely manner, after clarifying the cause of the disease, under the guidance of the doctor for targeted treatment.