A new profession is becoming known around us, and that is – fart smeller! Yes, you heard it right, the job of a fart smeller is to smell the patient’s farts to determine the patient’s physical condition. So, what do you know about the smell of farts? The gas in the intestine mainly comes from the process of food decomposition by bacteria and fermentation by fungi in the large intestine, so people who like to eat foods high in sugar usually have more farts. Although farts are unpleasant to smell, they are a normal physiological need of the human body. Foreign scientists have found that a person farts 6 to 20 times a day. On average, each person releases between 500 and 1,500 milliliters of exhaust gas per day. Not farting or farting less often means more prone to flatulence and gastrointestinal disorders. If a person not only does not fart or poop for several days, but also has bouts of abdominal pain, it is often a precursor to intestinal obstruction. In Chinese medicine, farting is called “yag qi”, which is considered to be an indicator of disease and is important for the treatment of acute and chronic gastritis, dysmenorrhea and other diseases. In Western medicine, “farting” is elegantly referred to as “exhaust”, for example, the doctor will ask the patient, “Have you exhausted today?” Normal farts are usually smelly, but not particularly so. If you give these smelly farts a general classification, there are even smelly farts, such as the milk farts of babies. However, such farts are unhealthy and usually indicate that the food your baby eats, such as milk, is not digested and absorbed well. The food you normally eat is “processed” by bacteria and turned into a gas rich in hydrogen sulfide, which is basically the smell of farts. A fart with a foul odor may indicate a bacterial infection in the intestinal tract of the farting person. The intestinal mucosa is damaged by bacterial toxins, and the fart may also discharge exfoliated necrotic mucosal epithelial cells, often with symptoms such as colic, urgency, and even fever. Fishy smelling farts may indicate gastrointestinal bleeding. The blood accumulates in the patient’s gastrointestinal tract, and the stomach acid and intestinal bacteria break down the blood, sometimes discharging stools that look like tar. In addition, when there is a malignant tumor in the intestinal tract, the fart will also have a fishy smell because the cancerous tissues are rotting, flaking and bleeding, plus the fermentation effect of bacterial decomposition. If the fart is not caused by eating food containing irritating odor such as garlic, onion, leek or excessive intake of meat, it should be taken seriously because such phenomenon may be caused by some intestinal inflammation or gastrointestinal dysfunction, and the fart may also be a symptom of intestinal cancer. A normal person farts 5-10 times a day, and about 500ml of gas is discharged. When the amount of farts is much more than usual, there may be indigestion, gastritis, and other stomach diseases as well as liver, biliary and pancreatic diseases. In addition, it may also be caused by eating, and treatment is usually not necessary. Abnormal farts are a barometer of health. The smell and amount of farts are related to our diet and can also reflect the health of the digestive tract.