Lactose intolerance is a hereditary condition caused by a lack of enzymes in the body that break down lactose, which can manifest as flatulence among the symptoms. Flatulence, on the other hand, can be caused by a variety of reasons such as intestinal flora imbalance, indigestion, and low gastrointestinal tract function. Lactose intolerance is a recessive genetic defect, due to the lack of enzymes in the body to break down lactose, the lactose in food can not be fully digested and absorbed by the enzyme lactase in the small intestine, and it stays in the intestinal lumen, causing a series of gastrointestinal symptoms, such as bloating, diarrhea, dyspepsia, abdominal pain, nausea, and vomiting by increasing osmolality in the intestinal lumen, and increasing the volume of food residue, and it most often occurs after consuming some dairy products. Intestinal flatulence refers to the accumulation of excessive gas in the gastrointestinal tract and can not be discharged, with spasmodic pain, abdominal distension, knocking the drumming sound as the main signs, when the condition is serious, it can cause shortness of breath and respiratory distress, mostly occurring in the flatulence compression of the diaphragm. The main causes of intestinal flatulence are constipation, indigestion, intestinal flora imbalance, gastrointestinal dysfunction, etc. Dyspepsia, abdominal distension, nausea and vomiting are the main clinical manifestations. It is recommended to consult a doctor in time to determine the cause of intestinal flatulence under the guidance of the doctor with relevant examinations and give targeted treatment to avoid delaying the condition, and when lactose intolerance occurs, it is recommended to avoid consuming lactose foods to avoid causing discomfort.