Farting after drinking milk can be caused by indigestion, flora disorders and lactose intolerance. 1. Indigestion: Milk is a high protein food, when the protein content can not be fully digested by the body, it will lead to farting after drinking milk especially stinky situation. 2. Bacterial disorder: If the patient’s intestinal flora is disturbed, the milk consumed may not be fully digested, which may lead to farting after drinking milk, which is particularly foul-smelling. 3. Lactose intolerance: when the patient’s body lacks the enzyme that breaks down lactose, after eating milk, because the lactose in the milk can not be completely broken down, abdominal distension and fart odor will occur. Therefore, it is recommended that patients go to the hospital in time for relevant examinations and timely treatment, so as to avoid delaying the condition and causing adverse consequences.