Frankly Speaking About Colorectal Cancer
(Second edition)
Understanding Colorectal Cancer
Colorectal cancer is the second most common cancer overall in the United States. Only lung cancer is more common.
Fortunately, the number of people diagnosed with colorectal cancer has been decreasing over the last 20 years, partly as a result of more screening, which results infinding and removing colorectal polyps before they turn into cancer.
The number of Americans who die from colorectal cancer has also declined in the last 20 years. This reflects the declining number of people diagnosed with colorectal cancer as well as improvements in early detection and treatment.
What is cancer?
Cancer is a condition in which cells multiply uncontrollably to form growths that invade and destroy normal tissue. Cancer cells can spread from their original site to other parts of the body. This is called metastasis (pronounced: muh-TASS-tuh-sis). The plural is metastases (pronounced: muh-TASS-tuh-seez).
Cancers are named for the place in the body where they begin, not where they may spread. So, for example, if you have colorectal cancer that has spread to the liver, you do not have liver cancer, you have liver metastases from colorectal cancer.
“I just keep thinking to myself: ‘I may have cancer, but cancer does not have me!’”
– Pam
What is colorectal cancer?
Cancer that begins in the colon is called colon cancer, and cancer that begins in the rectum is called rectal cancer. Cancer that starts in the colon or rectum may also be called colorectal cancer.
The colon and rectum are part of the body’s digestive system. The digestive system takes in nutrients (like vitamins and proteins) from foods and helps pass waste material out of the body. The organs in the digestive system include the esophagus, stomach, and the small and large intestines.
The first 6 feet of the large intestine are called the large bowel, or colon. The last 6-8 inches are the rectum and the anal canal. The anal canal ends at the anus (the opening of the large intestine to the outside of the body).
Anatomy of the lower digestive system, showing the colon and other organs.
Courtesy: National Cancer Institute
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