Eating a leek old fart is usually a physiological phenomenon, but may also be indigestion, intestinal flora imbalance and other pathological factors. Farting in the medical known as exhaust, leeks are rich in crude fiber, after eating can promote gastrointestinal peristalsis, promote intestinal gas discharge. Therefore, after eating leeks often exhaust is usually a physiological phenomenon. But may also be pathological factors, such as the existence of indigestion, plus leeks of crude fiber is difficult to absorb. After the fermentation of food in the intestinal tract, more gas accumulates, and there is an increase in the amount of flatulence. When the intestinal flora is dysbiotic, the harmful bacteria increase compared to probiotics, and react with the intestinal contents to increase gas production, resulting in frequent flatulence. The above are some of the possible causes, and it is recommended to consult a medical professional for diagnosis of specific cases.