Strange fart odor does not necessarily indicate a disease, but is first considered to be related to diet. If patients often eat gas-producing foods, such as sweet potatoes, beans and soy products, potatoes, etc., the starch and protein in the food may be decomposed into foul-smelling gas during the intestinal retention. There are some people who prefer more stimulating food such as onions, leeks, raw garlic, ginger, etc., after eating in the intestinal decomposition will also produce a heavy odor, is a normal physiological phenomenon. In addition to the above, patients often fart strange odor, may be related to the following diseases: 1, indigestion: patients may be due to external environmental factors and bacterial or viral infections, resulting in indigestion. Patients may be accompanied by abdominal pain, diarrhea, watery stools and other accompanying symptoms. Due to poor peristaltic function, resulting in the accumulation of food in the gastrointestinal tract, producing gas, after the intestinal peristaltic operation of the discharge, it will carry the taste of the intestine, becoming fishy and unpleasant; 2, gastrointestinal bleeding: if the patient has gastrointestinal bleeding, the accumulation of blood in the intestine may lead to abdominal pain, tarry stools, the patient’s body gas carrying the blood and food generated by the decomposition of the intestine together with the outward discharge. There may be an unpleasant smell; 3. Intestinal lesions: If patients have intestinal lesions such as enteritis and intestinal cancer, inflammatory sites or malignant tissues may become erosion and bleeding. The foul-smelling gas will be produced after the decomposition of intestinal flora, and usually these patients will also suffer from abdominal pain, constipation, shortness of breath, abnormal stool characteristics and other accompanying symptoms. The above three diseases are not the only indicators of fart odor, and because of the large differences in individual cases, a comprehensive assessment should be made on a case-by-case basis. If a patient has a strange fart with accompanying symptoms such as abdominal pain or diarrhea, he or she should actively go to the hospital for examination and take appropriate treatment. If a patient has only a single manifestation, he or she should pay attention to minimizing the consumption of excessive gas-producing foods and strong-tasting foods in daily life, which can avoid the occurrence of this symptom to a certain extent.