1. Constipation
Constipation is an important sign of cancer in the colon. A 2011 study published in the Asian Pacific Journal of Cancer Prevention highlights the link between constipation and colorectal cancer risk.
An earlier 2004 study published in the European Journal of Cancer supported the hypothesis that constipation or laxative use increases the risk of colon cancer.
A tumor present at the far end of the colon can make it very difficult to eliminate waste products, thereby causing constipation.
If you persistently have fewer bowel movements per week, without any prior problem of constipation, consult your doctor to find out the exact cause.