In general, lying down with a bulge in the stomach to move a little and disappeared to consider for abdominal hernia, gastrointestinal dysfunction and other causes. 1. Abdominal hernia: caused by tissue defects or decreased supportive role of the abdominal contents, such as intestinal tubes, omentum, etc. to reach the subcutaneous, the formation of a mass, common inguinal hernia and hiatal hernia, femoral hernia, umbilical hernia and so on. When the movement, due to the increase of intra-abdominal pressure, will lead to the appearance of hernia, the abdomen will appear bulging, when the intra-abdominal pressure drops after moving, the bulging will disappear again. 2. Gastrointestinal dysfunction: such as irritable bowel syndrome, can cause gastrointestinal function is weakened, after eating due to slow gastrointestinal peristalsis, may lead to the accumulation of food in the gastrointestinal tract, resulting in a bulge in the stomach, with the continuous movement of the gastrointestinal or body position changes, the food continues to be digested, the abdominal mass can continue to move forward or disappear. Lying stomach bulge move a little and disappeared there may be intestinal accumulation of gas and other causes, it is recommended to seek medical attention in order to clarify the diagnosis, under the guidance of the doctor for targeted treatment.