One way to test for colorectal cancer is to look for occult (hidden) blood in the stool. If the test results are positive (that is, if hidden blood is detected), a colonoscopy will be needed to investigate further. Although blood in the stool can be from cancers or polyps, it can also have other causes, such as ulcers, hemorrhoids, or other conditions.
Patients with colorectal cancer are managed depending on the size and extent of the cancer, among other factors. Types of treatment may include surgery, chemotherapy, radiation therapy, or newer therapies like targeted therapy or immunotherapy.