The colon cancer symptoms may include severe abdominal pain, rectal bleeding, weight loss for no apparent reason, or changes in bowel habits (constipation or recurrent diarrhea). But these symptoms often do not appear until the cancer is in its later stages. An absence of symptoms does not mean an absence of cancer. In fact, the colon cancer is sometimes called the "silent murderer" due to lack of symptoms until it is in advanced stages. A colonoscopy is the only method that can actually help prevent colon cancer in the future because during colonoscopy can find polyps, easily operable as part of the procedure, preventing these polyps can become cancer in the future. If cancerous polyps are found and can often be removed during colonoscopy and treatment can begin immediately.
When colon cancer is diagnosed in its early stages, the survival rate is 95%. So check-ups are extremely important. Once colon cancer spreads to the liver, is usually fatal, with a very low survival rate of 9%. A colonoscopy is recommended for both men and women aged equal or over 50 years, unless there are other risk factors such as family history, obesity, smoking, ulcerative colitis or Crohn's disease, in which case it should prevent be even more rigorous.
Source: http://www.cancersolution.tk/2011/06/colorectal-cancer-prevention.html
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