Location and appearance of two example colorectal tumors
Constipation in a young child seen on X-ray. Circles represent areas of fecal matter (stool is white surrounded by black bowel gas).
Longitudinally opened freshly resected colon segment showing a cancer and four polyps. Plus a schematic diagram indicating a likely field defect (a region of tissue that precedes and predisposes to the development of cancer) in this colon segment. The diagram indicates sub-clones and sub-sub-clones that were precursors to the tumors.
Bristol stool chart
Colon cancer with extensive metastases to the liver
Significant constipation in the plain X-ray of an 8-year-old
Relative incidence of various histopathological types of colorectal cancer. The vast majority of colorectal cancers are adenocarcinomas.
19th century satirical cartoon of a monkey rejecting an old style clyster for a new design, filled with marshmallow and opium
Micrograph of colorectal adenocarcinoma, showing "dirty necrosis".
A diagram of a local resection of early stage colon cancer
A diagram of local surgery for rectal cancer
Colon and rectum cancer deaths per million persons in 2012

Underlying associated diseases include hypothyroidism, diabetes, Parkinson's disease, celiac disease, non-celiac gluten sensitivity, colon cancer, diverticulitis, and inflammatory bowel disease.

- Constipation

The classic warning signs include: worsening constipation, blood in the stool, decrease in stool caliber (thickness), loss of appetite, loss of weight, and nausea or vomiting in someone over 50 years old.

- Colorectal cancer
Location and appearance of two example colorectal tumors

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Diagram of stomach, intestines and rectum in the average human

Gastrointestinal tract

Tract or passageway of the digestive system that leads from the mouth to the anus.

Tract or passageway of the digestive system that leads from the mouth to the anus.

Diagram of stomach, intestines and rectum in the average human
Illustration of the small intestine

Gastrointestinal cancer may occur at any point in the gastrointestinal tract, and includes mouth cancer, tongue cancer, oesophageal cancer, stomach cancer, and colorectal cancer.

Constipation, which refers to the passage of fewer and hardened stools