Vomiting bitter water in the morning is mainly considered to be the presence of gastrointestinal dynamics, biliary tract diseases, esophageal cardia lesions, and so on. 1. weakened gastrointestinal power: decreased gastrointestinal power can lead to bile reflux to the throat, vomiting bitter, yellow water, leading to the slowing down of gastrointestinal peristalsis factors include chronic gastritis, gastric ulcer, duodenal ulcer and other diseases. 2. Biliary tract diseases: such as cholecystitis, cholelithiasis, chronic pancreatitis, etc. These diseases can lead to vomiting yellow and bitter water in the morning. 3. Esophageal cardia lesions: These include structural disorders of the esophageal cardia, such as pancreatic achalasia, reflux esophagitis, and other disorders, which can lead to reflux of gastric contents and can result in vomiting of yellow and bitter water. Bitter water vomiting in the morning may also be due to other reasons, such as stomatitis, etc. It is recommended to go to the hospital for relevant examinations, such as gastroscopy, Helicobacter pylori examination, ultrasound examination of the liver, gallbladder, spleen, pancreas, etc., so as to make a clear diagnosis, and then give reasonable treatment.