Flatulence may be caused by gastrointestinal dysfunction, nervousness and sedentary behavior. 1. Gastrointestinal dysfunction: due to gastrointestinal dysfunction, its own digestive function is impaired, in the car bumps, abdominal muscles are stimulated, gastrointestinal peristalsis accelerated, food digestion faster, gas production increased, the symptoms of flatulence will occur. 2. Nervous tension: when riding in a car, when the car is faster or the road is rugged, there is mental tension, vagus nerve excitability increases, which will lead to an increase in peristalsis of the gastric smooth muscle, thus increasing gas production, and there will be the phenomenon of gastric flatulence. 3. Sedentary: due to long-term sedentary in the car, the peristaltic ability of the gastrointestinal tract is reduced, the food in the stomach stagnation fermentation, gastrointestinal phenomenon, the phenomenon of gastrointestinal tract, at this time there will be the symptoms of flatulence. Sitting in the car stomach flatulence may also be caused by other reasons, it is recommended that the patient as soon as possible to the hospital, to identify the cause of the disease, under the guidance of the doctor for treatment.