Colorectal cancer
Classification and external resources
Diagram of the lower gastrointestinal tract
ICD-10	C18.-C20./C21.
ICD-9	153.0-154.1
ICD-O:	M8140/3 (95% of cases)
OMIM	114500
DiseasesDB	2975
MedlinePlus	000262
eMedicine	med/413 med/1994 ped/3037

Colorectal cancer, also known as colon cancer, rectal cancer, or bowel cancer, is a cancer in the colon or rectum (parts of the large intestine), or in the appendix. Genetic analysis shows that essentially colon and rectal tumours are genetically the same cancer. Symptoms of colorectal cancer typically include rectal bleeding and anemia which are sometimes associated with weight loss and changes in bowel habits (defecation pattern).