Farting is also known as anal exhaust, eating and intestinal gas production has a certain relationship, so when eating or after eating anal exhaust is a normal physiological phenomenon. When eating or after eating exhaust is mainly due to people in the eating, the digestive tract normal flora will digest the food in the intestine, produce hydrogen sulfide and other gases, the gas with the intestinal peristalsis, can be discharged through the anus; eating with the food into the digestive tract, there will be part of the gas is swallowed, part of the unabsorbed gas will ultimately be discharged out of the body through the anus. If there is no anal excretion for a long time, we should be alert to the possibility of certain diseases, such as pediatric anal insufficiency, intestinal obstruction, intestinal tumors, intestinal torsion, etc. Frequent excretion should also be considered for pathological factors, such as intestinal bacterial imbalance and so on. It is recommended to consult a doctor in time for clear diagnosis and treatment under the guidance of a professional physician.