S. BENJAMIN, CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY S. BENJAMIN, CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Colon cancer. Colonoscope (endoscope) view of malignant tumours in the human colon. The tumours are seen as reddened lumps at upper centre, with normal colon tissue pale pink. Symptoms of colon cancer are changed bowel movements (constipation or diarrhoea), blood in the faeces and lower abdominal pain. Sometimes there are no symptoms until the tumour grows so big as to obstruct the intestine. Surgical removal (colectomy) is a usual treatment, with a good prognosis if the cancer is discovered early. Colon cancer is thought to be more common in those with a high-fat, low-fibre diet.
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