Hi there.. An abdominal lump is a swelling or bulge that emerges from any area of the abdomen. causes could be epigastric hernia, umbilical hernia, lipoma, tumors of abdominal organs, obesity, ascites, liver or spleen enlargement. Without examining it's difficult to tel the reason.get ultrasound-abdominopelvis.. please consult nearby surgeon for complete examination and to know the cause and for further management..