The right abdominal pain with a lump may be caused by appendiceal abscess, lipoma, intestinal tumor, ovarian tumor and so on. 1. Appendiceal abscess: it may be caused by appendiceal abscess due to appendiceal infection, and the main feature of appendiceal abscess is pain in the right lower abdomen, and the phenomenon of abdominal mass may also occur. 2. Lipoma: the main feature of this disease is localized mass, accompanied by pain. Surgery is usually the treatment of choice to remove the diseased tissue. 3. Intestinal tumor: it may also be caused by intestinal tumor. For example, the tumor of ascending colon often manifests as right abdominal mass, which is also accompanied by local pressure and pain, and there are obvious symptoms such as abnormal bowel movement, black stool or stool with blood. 4. Ovarian tumor: right ovarian tumor can also cause right abdominal pain and mass. Therefore, if patients have severe or persistent right abdominal pain, they should go to the hospital in time to clarify the cause and get treatment as soon as possible.