Flatulence on a full stomach can be caused by improper diet, as well as other diseases such as indigestion, chronic gastritis and gastric ulcer. 1. Improper diet: If the patient eats too quickly or too much during the meal, as well as eating a large amount of dietary fiber containing food, will lead to gas production or gastrointestinal tract to increase the accumulation of gas, resulting in the patient to eat a full stomach flatulence phenomenon. 2. Dyspepsia: Dyspepsia is caused by a combination of factors, including gastrointestinal dyskinesia and visceral hypersensitivity. The main symptoms of patients are postprandial fullness, middle and upper abdominal pain, early fullness and so on, so patients will have the symptom of flatulence on a full stomach. 3. Chronic gastritis:Chronic gastritis is caused by a variety of reasons, partly due to the combination of Helicobacter pylori infection. Patients will experience symptoms such as fullness, discomfort in the upper and middle abdomen, and dull pain, so patients will have the manifestation of flatulence on a full stomach. 4. Other: gastric ulcer, intestinal obstruction and other diseases can also lead to the phenomenon of flatulence on a full stomach. When patients have symptoms of flatulence on a full stomach, it may be caused by diet and does not require treatment. If it is a disease that causes flatulence, the patient should consult a doctor in time and follow the doctor’s instructions for treatment.