The gallbladder can not be seen by ultrasonography when there is a lot of gas in the abdomen. It is recommended to adjust the diet or change the examination method to observe the gallbladder. 1. Adjust diet; avoid eating gas-producing foods such as tofu and soybeans before the examination; you can promote exhaustion through abdominal massage; it is also recommended to avoid nervousness and anxiety before the examination to avoid gastrointestinal dysfunction causing intestinal flatulence. 2. Change examination: ultrasonography is easily disturbed by gas, which may affect the examination results. If the situation cannot be improved by adjusting the diet, you can change the examination method under the doctor’s advice, and choose the abdominal computerized tomography (CT) and magnetic resonance imaging (MRI) for the examination.