Flatulence can be caused by physiological or pathological factors, such as: improper diet, gastric ulcer, chronic gastritis, etc. 1. Physiological: usually eat a lot of greasy, high-sugar food or gas-producing food, such as: onions, soybeans, etc., which will lead to excessive gas production in the stomach and flatulence. 2. Gastric ulcer: due to the weakening of gastrointestinal peristalsis, flatulence may occur, especially ulcers at the gastric sinus can easily lead to gastric gas or gastric contents discharge obstruction, which will aggravate the situation of abdominal distension. 3. Chronic gastritis: chronic gastritis can lead to gastric mucosal damage, affecting gastric peristalsis, slowing down the gastric exhaust, so you will feel gas in the stomach, bloating. There are other causes of flatulence, if the symptoms of flatulence worsen or continue to be unrelieved, it is recommended to go to the hospital, under the guidance of the doctor to clarify the cause of the disease, symptomatic treatment.