Farting after drinking milk may be caused by lactose intolerance, indigestion, irritable bowel syndrome, and other causes such as intestinal dysbiosis. 1. Lactose intolerance: Lactose intolerance is caused by a congenital decrease in the expression of the lactase gene, or damage to the mucosa of the small intestine caused by inflammatory bowel disease or radiotherapy. Patients will have hyperactive bowel sounds, abdominal distension, nausea and vomiting, diarrhea, colic and other manifestations after eating dairy products. If patients have lactose intolerance, they may have bloating and farting after drinking milk. 2. Dyspepsia: dyspepsia is considered to be caused by heredity, gastrointestinal dyskinesia, and visceral sensory hypersensitivity. Patients may have symptoms such as postprandial fullness, early satiety, and upper-middle abdominal pain. As a result, patients who drink milk, which is not easily digested in the stomach, may experience bloating and farting a lot. 3. Irritable bowel syndrome: The cause of irritable bowel syndrome is still unclear, and it is considered to be related to abnormal gastrointestinal dynamics, intestinal infections, food intolerance and other reasons. Patients will have abdominal pain, diarrhea, constipation, heartburn, abdominal distension and other manifestations, and the patient’s abdominal pain symptoms will be relieved after defecation or exhaust. If the patient himself suffers from irritable bowel syndrome, after drinking milk may appear to fart a lot of performance. 4. Other: farting after drinking milk may also be caused by intestinal flora dysbiosis and chronic gastritis. It is recommended that patients who have farted a lot after drinking milk need to consult a doctor in time, and the doctor will choose targeted measures to treat the cause of the disease.