Farting a lot after eating raw onions may be related to the characteristics of onions, but onions themselves are irritating, excessive consumption may damage the mucous membrane of the gastrointestinal tract. Onion is a kind of easy to produce gas food, after consumption will lead to increased intestinal gas, thus causing fart phenomenon, this situation is related to the characteristics of food, will not affect the body. Onion is rich in dietary fiber, after consumption can promote gastrointestinal peristalsis faster, can also promote gas defecation. However, onion is also a stimulating food, if the gastrointestinal tract is not good, need to avoid eating a lot of onion, so as not to gastrointestinal tract by the adverse stimulation caused by gastrointestinal tract mucosal damage, stimulation, resulting in peristaltic abnormalities caused by the increase in exhaust.