Stomach distension and vomiting may have the following causes: 1. Due to indigestion, some patients often show a lack of gastric power because of their poor constitution. When patients eat irritating food or food that is difficult to digest, they will experience flatulence, uncomfortable and vomiting. 2. Patients with imbalance of intestinal flora, a large amount of waste gas accumulates in the intestinal tract and cannot be discharged in time, which will also cause symptoms of bloating and vomiting. 3. If patients suffer from gastrointestinal tumors, chronic gastritis and other gastrointestinal diseases such as gastric dilatation, they will also cause gas to accumulate in the gastrointestinal tract, resulting in bloating, uncomfortable and vomiting. 4, gastrointestinal dysfunction, there will be gas discharge and absorption disorders, which will also lead to bloating, uncomfortable, vomiting.