Colorectal cancer
Cancer of the colon or rectum
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Key Takeaways
- Colorectal cancer , also known as bowel cancer , colon cancer , or rectal cancer , is the development of cancer from the colon or rectum (parts of the large intestine).
- Signs and symptoms may include blood in the stool, a change in bowel movements, weight loss, abdominal pain and fatigue.
- Risk factors include diet, obesity, smoking, and lack of physical activity.
- Another risk factor is inflammatory bowel disease, which includes Crohn's disease and ulcerative colitis.
- It typically starts as a benign tumor, often in the form of a polyp, which over time becomes cancerous.
Colorectal cancer, also known as bowel cancer, colon cancer, or rectal cancer, is the development of cancer from the colon or rectum (parts of the large intestine). It is the consequence of uncontrolled growth of colon cells that can invade/spread to other parts of the body. Signs and symptoms may include blood in the stool, a change in bowel movements, weight loss, abdominal pain and fatigue. Most colorectal cancers are due to lifestyle factors and genetic disorders. Risk factors include diet, obesity, smoking, and lack of physical activity. Dietary factors that increase the risk include red meat, processed meat, and alcohol. Another risk factor is inflammatory bowel disease, which includes Crohn's disease and ulcerative colitis. Some of the inherited genetic disorders that can cause colorectal cancer include familial adenomatous polyposis and hereditary non-polyposis colon cancer; however, these represent less than 5% of cases. It typically starts as a benign tumor, often in the form of a polyp, which over time becomes cancerous.
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