Sigmoid colon polyp and fart very smelly may be due to indigestion, intestinal mucosal irritation, malignant tumor secretion and other reasons. 1. Indigestion: polypoid sigmoid colon, may lead to the accumulation of food in the intestinal tract, over time the host food corruption and fermentation, resulting in fart stink. 2. Intestinal mucosal irritation: benign sigmoid colon occupations may compress and irritate the intestinal mucosa, resulting in enteritis and other causes, leading to farting very smelly. 3. Malignant tumor secretion: sigmoid colon malignant tumor, the tumor will have some abnormal secretion, resulting in fart stink. Sigmoid colon occupation and fart very stinky cause there are many other reasons, the patient should consult a doctor in time, improve the relevant examination to clarify the cause of the disease, in the doctor’s formal guidance under the treatment.