The right abdomen always feels bloated but without pain may be caused by liver cyst, cirrhosis, cecum cancer and so on. 1. Liver cyst: it is a common benign lesion in liver, most of the patients have no obvious symptoms, some of the people may manifest right upper abdominal distension, fullness, which may be accompanied by vague pain or dull pain in upper abdomen, dyspepsia and other symptoms, which may be manifested as a feeling of bloating in the right abdomen but without pain. 2. Cirrhosis: it is the final stage of the development of various chronic liver diseases. In the early stage, there may be no symptoms, or there may be symptoms such as mild fatigue, loss of appetite, abdominal distension, nausea, epigastric tenderness, etc. In serious cases, there may be symptoms such as ascites, jaundice, edema of lower limbs, abdominal pain, vomiting of blood, black stools, etc. It may also manifest as a feeling of fullness in the right abdomen. It can also be manifested as the right abdomen always feels distended without pain. 3. Appendix cancer: refers to the cancer occurring in the appendix, with no obvious symptoms in early stage, but symptoms such as anemia, epigastric fullness, nausea, diarrhea or constipation, change of stool habit and character in late stage, etc. It may also be manifested as a feeling of bloating in the right abdomen but without pain. There are many other causes of right abdominal distension without pain, which should be emphasized, timely consultation, identify the cause of the disease, and follow the doctor’s instructions for further treatment or therapy.