Flatulence after eating is caused by improper diet, indigestion, irritable bowel syndrome and imbalance of intestinal flora, but eating food that is easy to produce gas and too cold will cause stimulation to the digestive system and affect the function of the digestive system, and many people will have a feeling of bloated stomach after meals. When the human body has indigestion, not only the intestinal peristalsis will be relatively slow, but also there will be insufficient secretion of digestive juices, because the food can not be digested in time, so it will be fermented in the stomach to produce gas, so the feeling of flatulence will appear after meals. Irritable bowel syndrome mainly occurs when there are bad emotions, such as stress, depression, anger, and these bad emotions will lead to disorders of the body’s plant nerves, which will affect the function of the stomach and intestines, and many people will experience undigested food and abdominal flatulence during the disease. Some people have an imbalance of intestinal flora, especially in the excessive growth of gas-producing bacteria will react with food residues to produce a lot of gas, which leads to intestinal flatulence after meals.