Flatulence and farts before menstruation may be caused by cold weather, normal phenomenon, indigestion and improper diet. 1. Cold weather: As the weather is too cold, and then wearing too thin clothes and not keeping warm, so that the body is attacked by the cold wind, it will cause menstrual irregularities, and there may be flatulence and farting. 2. Normal phenomenon: before menstruation, the pelvis and uterus are in a state of congestion, which will cause the intestinal peristalsis to be slower, and the gas will be gathered in the intestines, so the situation of flatulence and farting will occur. 3. Dyspepsia: dyspepsia is a disease caused by gastric dysfunction, in which there will be abnormal intestinal peristalsis, esophageal reflux, and clinical symptoms are mostly manifested as abdominal distension, belching, so there will be the phenomenon of flatulence and farts. 4. Improper diet: Eating more gas-producing foods, such as soybeans, pumpkin, sweet potatoes, etc., into the gastrointestinal tract, can be decomposed to produce more gas. This may lead to bloating and farting. Bloating and farting before menstruation, there are other reasons, such as gastritis, gastric ulcer, enteritis, etc. If the duration is longer, it is recommended to go to the hospital for examination, to clarify the cause of the disease, targeted treatment.