Colorectal cancer can originate anywhere in the large intestines. The majority of colorectal cancers develop first as polyps , abnormal growths inside the colon or rectum that may become cancerous.
Colorectal cancer is more likely to occur as people get older.
A family history of colorectal cancer or colorectal polyps increases the risk of developing colorectal cancer. If you have any of these symptoms, discuss them with your doctor. Many other health problems can cause these symptoms, too. Only your doctor, through testing, can tell you why you're having these symptoms. Unlike for many other cancers, there are several screening tests that check for colorectal cancer.