Early Detection Is Key
The ACS suggests that both men and women be screened for colorectal cancer starting at age 50. The gold standard diagnostic test is the colonoscopy. If no precancerous polyps are found, you may not need to have the test repeated more than once every 10 years. If you have a family history of colon or rectal cancer, you may need to be tested earlier. Talk with your doctor about this.
Take the National Cancer Institutes colorectal cancer risk assessment here.