Why do you need a colonoscopy?

Posted by Purvi Gada, MD, Minnesota Oncology and Ridgeview Cancer & Infusion Center on Mar 26, 2019 1:30:00 PM

undefined-372140-editedMarch is Colorectal Cancer Awareness Month, a time set aside to remind all men and women to speak with their health care providers about getting screened for the disease. By finding cancer or polyps early that may become cancer, it is easier to treat and possibly cure.

According to the American Cancer Society, colon cancer is the third leading cause of cancer deaths for men and women. It is estimated that approximately 140,000 new cases are expected to be diagnosed this year, and more than 50,000 people will lose their lives to the disease. However, the number of cases and deaths from colorectal cancer has declined over the past 15 years in large part because of colorectal cancer screening, which can detect polyps before they turn into cancer.

For both men and women at average risk for colorectal cancer, the American Cancer Society recommends screening begin at age 45 using one of the tests listed below. 

Tests that find polyps and cancer

Tests that many find cancer

** For FOBT or FIT used as a screening test, the take-home multiple sample method should be used. An FOBT or FIT done during a digital rectal exam in the doctor's office is not adequate for screening.

For people with certain risk factors, screening should begin earlier or be done more often. While the exact cause of colorectal cancer is unknown, risk factors for the disease include:

  • Age - chances of being diagnosed with colorectal cancer increase as a person gets older
  • Family history - having close relatives with colorectal cancer increases a person's risk of developing the disease
  • Diet - diets high in fat and low in calcium, folate and fiber may increase the risk
  • Ethnicity - Jews of Eastern European descent have a higher rate of colon cancer
  • Genetic alterations - certain syndromes that involve family members having hundreds of polyps in their colon or rectum may make someone more likely to get colorectal cancer
  • History of colorectal polyps - common in people over the age of 50, some growths on the inner wall of the colon or rectum can become cancerous
  • Smoking - may increase risk of developing polyps and colorectal cancer
  • Alcohol - heavy use of alcohol has been linked to the disease
  • History of bowel disease - a disease called ulcerative colitis (Crohn's colitis) increases the risk of colon cancer
  • Lack of exercise - people who are not active have a higher risk of colorectal cancer
  • Overweight - being overweight increases a person's risk

Colon Screening




Medical and health information presented here is intended to be general in nature, and should not be viewed as a substitute for professional advice. Please consult with a health care professional for all matters relating to personal medical and health care issues. In case of an emergency, please call 911. 

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