Tumors develop from the linings of the large intestines usually in areas where colon polyps have formed. These tumors are usually slowly enlarging, but may reach very large sizes. They may eventually obstruct the intestinal tract or spread to nearby organs. Detection of these cancers is readily done through colonoscopy.
Causes of Colorectal Cancer
Colorectal cancer commonly develops from benign colon polyps. Diets rich in animal fats and low in dietary fiber are associated with an increased incidence of colorectal cancer. A personal or family history of colon polyps or of colon cancer increases the risk of developing the disease.
Signs and Symptoms of Colorectal Cancer
The symptoms which appear increase as the tumor enlarges. At first, there may be minimal or no symptoms. As the tumor progresses, there is usually a change in the frequency, appearance, or size of the stool. In addition, blood in the stool or black stools may occur. People develop lower abdominal pain and swelling. Loss of weight and loss of appetite commonly occur. With increasing blood loss, people may feel fatigued or develop shortness of breath or rapid or irregular heart beats. If the tumor obstructs the intestinal tract, severe constipation, abdominal swelling, nausea, and vomiting will occur.
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Medical Content Last Updated on 07/12/2008
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