Lying on the right side of the lower abdomen often bulging a bag immediately subsided may be caused by intestinal flatulence, some diseases may also appear similar symptoms, such as abdominal wall hernia and so on. Swallowing too much gas, gastrointestinal dysfunction, increased gas production by intestinal bacteria, weakened gastrointestinal power and other factors can lead to intestinal flatulence, which is often accompanied by symptoms such as bloating, acid reflux, loss of appetite, constipation, etc. Some people with a thin body may also suffer from flatulence under normal circumstances. Some people with a thin body, under normal circumstances will also appear abdominal bulging, swimming phenomenon, if there are no clinical symptoms can be temporarily untreated. The patient’s abdominal wall is locally weak, intra-abdominal pressure and other factors may lead to abdominal hernia, abdominal contents will leave the normal anatomical position, into the hernia sac. The hernia sac bulges out when standing or sitting, and the hernia contents flow back into the abdominal cavity when lying down, resulting in the disappearance of the bulge. Therefore, the clinical appearance of such symptoms, should be timely consultation, improve the examination, a clear diagnosis needs to follow the doctor’s instructions for treatment or disposal.