Possible causes of bloating in the right upper abdomen include chronic cholecystitis, hepatitis, liver tumor, liver abscess and other diseases of the hepatobiliary system. 1. Chronic cholecystitis: eating a high protein, greasy diet may cause symptoms of bloating and indigestion, which may be accompanied by pain in the upper right abdomen. 2. Hepatitis: early stage of the disease may have no obvious symptoms or right upper abdominal distension and discomfort, which may be accompanied by generalized weakness, loss of appetite and other symptoms. 3. Liver tumor: Early stage of the disease may be manifested as persistent vague pain, distension or stabbing pain in the right upper abdomen or middle-upper abdomen, which may be aggravated at night or after exertion. 4. Liver abscess: patients may have the manifestation of right upper abdomen distension, accompanied by fever, anorexia and other symptoms. There may be other reasons for the swelling of the right upper abdomen, it is recommended to go to the hospital in a timely manner to improve the examination, to clarify the cause of the disease and then give targeted treatment.