Brushing your teeth in the morning and spitting yellow bitter water can be caused by gallstones cholecystitis, bile reflux gastritis and other diseases. 1. gallstones: gallbladder stones can lead to obstruction of the gallbladder duct, which in turn leads to localized infections and inflammation of the gallbladder, which can lead to bile secretion disorders and increased excretion of bile, which can increase due to the increase in stimulation when brushing the teeth and lead to the emergence of vomiting of yellow bitter water. 2. Bile reflux gastritis: due to Helicobacter pylori infection, bile reflux into the stomach, resulting in gastric mucosal damage, can trigger bile reflux gastritis, can occur when brushing teeth, vomiting yellow bitter water performance, accompanied by abdominal distension, stomach burning and other uncomfortable symptoms. 3. Other factors: acute gastroenteritis, acute gastrointestinal cold caused by staphylococcus aureus infection, can cause nausea, vomiting, acid reflux and other discomforts, can be seen when brushing teeth, vomiting yellow bitter water performance. When brushing teeth, spitting yellow bitter water persists unrelieved, need to consult a doctor in a timely manner, under the guidance of specialists to actively carry out appropriate treatment, will help to alleviate the uncomfortable symptoms as soon as possible.