The symptoms of abnormal intestinal fermentation mainly refer to some manifestations of irritable bowel syndrome, which are usually related to intestinal dysfunction or dyspepsia, and their symptoms can be divided into physiological manifestations and changes in mental status. 1. physiological manifestations: because the patient’s intestinal peristalsis slows down, the intestinal contents accumulate in the intestine for a long time, while the intestinal flora is dysbiosis, so that the intestinal contents are decomposed and fermented by some bacteria in the intestine, such as Escherichia coli. Produce a large amount of gas, which leads to a series of clinical manifestations such as abdominal distension, belching, halitosis, burping, and even over-smelling exhaust; 2. Mental state: abnormal intestinal fermentation may cause the mental state of patients to be affected, such as symptoms of insomnia, anxiety, depression, etc., and when the nerves in the brain are affected, there will also be frequent headaches and lack of concentration. Such patients should pay attention to their daily diet, avoid eating gas-producing foods, such as radish, leek, soy products, etc., and reduce the intake of spicy and stimulating foods, such as chili pepper, pepper, garlic, etc., to avoid stimulation of the intestinal mucosa, resulting in abnormal intestinal motor function, etc., which can cause abnormal intestinal fermentation. Bifidobacterium can also be taken to regulate intestinal flora, promote intestinal peristalsis, balance the imbalance of intestinal flora, which helps to reduce the symptoms.