Stomach bloating is usually caused by gastroptosis, food accumulation, gastrointestinal dysfunction, etc. When the patient is standing, the position of the stomach will move down due to gravity, resulting in a decrease in volume. 1. Gastric ptosis: When patients with gastric ptosis stand up, the position of the stomach will shift downward due to gravity, resulting in a decrease in volume, and the symptoms of gastric ptosis will be relieved when they lie down, which will result in the patient’s stomach being distended when standing up, but not distended when lying down on the bed. 2. Accumulation of food: when food accumulates in the stomach as a result of over-eating, part of the food cannot be fully absorbed and digested, and the symptoms of abdominal distension are relieved when the patient changes the body position, and there may be the symptom that the stomach is distended when the patient is standing up, but not when the patient is lying down on the bed. 3. Gastrointestinal dysfunction: Gastrointestinal dysfunction will lead to gastrointestinal food can not be absorbed in time, intestinal bacterial fermentation produces gas and flatulence, lying down will relieve the discomfort symptoms, there will be the case of the patient’s stomach bloating when standing up, lying on the bed, the stomach is not bloated. It is recommended that patients consult a doctor in time to identify the cause of the disease and standardized treatment with the help of the doctor.