A wide variety of microorganisms live in the gastrointestinal tract of healthy people. These microorganisms are called intestinal flora. Intestinal flora is combined in a certain proportion, and each bacteria restricts and depends on each other, forming an ecological balance in quality and quantity. Once the internal and external environment of the body changes, the characteristic is that long-term use of broad-spectrum antibiotics will inhibit sensitive intestinal bacteria, and the uninhibited bacteria will take the opportunity to multiply, thus causing flora imbalance. Its normal physiological combination is destroyed, and a pathological combination is produced, causing clinical symptoms, which is called intestinal flora imbalance. The incidence of this disease is about 2% to 3%.