Farting odor may be a physiological phenomenon, or it may be caused by some kind of disease, such as intestinal tumors, intestinal infections, and you should consult a doctor in time to find out the cause of the disease. 1. Physiological phenomenon is seen in the consumption of large amounts of protein-containing substances such as meat. Protein in the digestive tract is decomposed and metabolism process, by the intestinal bacteria decomposition and fermentation, will produce hydrogen sulfide and the formation of odor. 2. Pathological factors: intestinal bacterial infection can destroy the intestinal mucosa, intestinal mucosal necrosis and shedding will release odor; intestinal cancer, gastrointestinal dysfunction, may make the fart smell bad. If there is blood in the stool, change of stool color, diarrhea, constipation, etc., you should consult a doctor in time. If physiological reasons are excluded, you should consult a doctor in time to find out the cause of the disease and follow the doctor’s instructions for standardized treatment.