Upper abdominal distension may be related to gastrointestinal disorders, gallbladder disorders, pancreatic disorders and other causes. 1. Gastrointestinal diseases: If you suffer from gastrointestinal dysfunction, you may experience epigastric distension, nausea, vomiting, abdominal pain and other symptoms. 2. Gallbladder diseases: such as chronic cholecystitis, persistent right upper abdominal pain or discomfort, nausea, vomiting, belching, acid reflux, epigastric distension and other symptoms. 3. Pancreatic diseases: such as chronic pancreatitis, when complicated by pancreatic hydrothorax, abdominal distension can occur. It is recommended to go to the regular hospital in time, to clarify the cause of the disease, under the guidance of the doctor for standardized treatment, so as not to delay the condition of the body to bring adverse effects.