The common causes of bloating and watery mouth include functional factors, gastrointestinal disorders, gastric ulcers and so on. 1. Functional factors: stressful life, mental tension, etc., may cause excessive secretion of gastric acid, resulting in bloating, vomiting and so on. 2. Gastrointestinal tract dysfunction: Long-term diet irregularity or improper diet, causing gastrointestinal tract dysfunction, accelerating the secretion of gastric acid, stimulating the gastric mucosa, resulting in bloating and vomiting of water. 3. Gastric ulcer: excessive secretion of gastric acid, gastric mucosa damage, causing reflux, bloating and vomiting. There may be other reasons for the bloating and vomiting, such as gastroesophageal reflux disease, etc. It is recommended to go to the hospital in time to find out the cause of the problem and carry out standardized treatment under the guidance of the doctor.