question: Hi, I am a 43 year old female.  I am very overweight but have always been in good health.  However, recently I have found a lump that is movable and soft on the left side of my belly button.  It is pressing in and and begininng to close my belly button on that side.  Also I have noticed changes in my bowel movement frequency (more frequently)and maybe in my urination  (more frequent) as well.  I have also just developed a slight lower back ache.  Any ideas of thoughts on what it could mean and what I should do?