The causes of farting at night are dietary factors, gastrointestinal tract dysfunction, intestinal flora disorders and so on. 1. Dietary factors: because patients like to eat gas-producing foods, such as sweet potatoes, soy products, carbonated drinks, etc., resulting in an increase in abdominal gas. When it accumulates until the end of the night, the patient will have a very loud sound when he farts. 2. Gastrointestinal tract dysfunction: Due to the slowing down of peristalsis in the gastrointestinal tract, food cannot be completely digested and absorbed. The food residue retained in the intestines, after fermentation, produces a large amount of gas. When passing through the anus to ventilate, a loud noise will appear. 3. Intestinal flora disorders: Due to the intestinal flora disorders of patients, the number of harmful flora increases, and the fermentation reaction with the food residues in the intestines occurs, producing a large amount of gas. Therefore, when the patient farts, there will be a loud noise. If the patient appears to fart very loudly every night and can exclude the cause of dietary factors, it is recommended that the patient go to the hospital in time. Improve the gastroscopy, color ultrasound and other tests to clarify the cause of the disease, and follow the doctor’s instructions for treatment. So as not to delay the condition.