Functional abdominal distension is abdominal distension and fullness discomfort. Patients themselves feel that their stomachs are too distended, and above the pubic hair interval below the stomach and epigastric region is called the abdomen. In addition to abdominal distension and discomfort, some patients also suffer from loss of appetite, constipation and indigestion throughout the gastrointestinal tract. If functional abdominal distension is done on abdominal plain film, some patients can see the pneumatization of the gastrointestinal tract, but some other patients do not have serious pneumatization of the gastrointestinal tract, but only have increased intestinal sensitivity and increased intestinal sensitivity than others, so they feel full and uncomfortable, in fact, normal people do not feel, but they feel full and uncomfortable. Most patients mainly show many symptoms such as abdominal distension, inability to relieve, and also pain, constipation and indigestion.