Is colon cancer genetic? I am so sacred because i have had constipation for a long time now, although they have been off and on, I have also had problems with strong stools, blood coming out as a result with the hard stool and see blood on the toilet paper when i wipe. Alot of constipation and bloating off and on too. I have summed it all up and i am worked up thinking i might have a cancer. Please help.