Colorectal cancer, also known as colon cancer, rectal cancer, or bowel cancer, is a type of cancer which develops in the colon or large bowel. Colorectal cancer generally starts from a polyp growth, which may grow on the inner wall of the colon or rectum. Subsequently, the uncontrolled growing cells can invade or spread to elsewhere in the body thus result in metastasized cancer. Several factors may increase the risk of colorectal cancer such as inherited genetic disorders, living style, older age, smoking, alcohol, colon polyps, exposure to radiation or other factors. Colorectal cancer can be diagnosed by barium enema or by colonoscopy combined with biopsy confirmation of a colon tissue sample.
Sign and symptom
The classic signs and symptoms of colorectal cancer may include blood in stool, a change in bowel movements, weight loss, a change in stool caliber (thickness) and always feeling tired. Other signs and symptoms may vary depending on the location of bowel tumor, and the parts of the body where tumor metastasize to.
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