Vomiting yellow water on an empty stomach has certain harmful effects on the body. This situation is usually considered to be caused by physiological factors such as morning hunger, improper diet, and plant nerve disorders. If it occurs only occasionally, there is no need to worry, you can brush your teeth and rinse your mouth after drinking warm water, local hot compresses; or improve your diet, avoid spicy food stimulation, avoid staying up late, and relieve discomfort through exercise, listening to music and other methods. However, if this situation is likely to damage the gastric mucosa for a long time, and there is no content in the stomach when fasting, vomiting yellow water may aggravate the symptoms of gastrointestinal discomfort, and in serious cases may even cause dehydration and digestive system diseases, it is necessary to seek medical attention in a timely manner. The yellow water vomited on an empty stomach may be gastric juice or bile. When vomiting occurs, the vomited gastric juice, bile or digestive tract contents irritate the esophagus and gastrointestinal mucosa, which can induce abdominal pain, bloating, nausea, stomach cramps and other digestive discomfort symptoms and easily cause bile reflux gastritis. In addition, if the continuous stimulation of the gastrointestinal mucosa may cause mucosal tearing, vomiting may also lead to the cardia mucosa tearing, appearing upper gastrointestinal bleeding. For example, when vomiting stomach contents and yellow water on an empty stomach, it may easily cause mucosal tearing and can lead to upper gastrointestinal bleeding, and some patients may experience vomiting bright red or dark red blood. Also, since nutrients cannot be replenished during vomiting, if the symptoms worsen with diarrhea, it may lead to dehydration of the patient. In addition, if the patient is vomiting stomach contents and then vomiting yellow water, it may cause multiple damages to the esophagus, which may lead to mucosal inflammation and eventually local mucosal intestinal epithelial hyperplasia due to long-term repeated stimulation. Therefore, if there is a long-term fasting vomiting yellow water, you need to see a doctor for examination. If the symptoms of yellow water vomiting on an empty stomach are due to hormonal influences in early pregnancy, frequent vomiting may affect eating and may have adverse effects on the health of the mother and fetus, so it is recommended to seek medical attention and rehydration therapy if necessary.