The eventual outcome of this is the formation of tumours, which can continue to grow in size, invading neighbouring tissue.
Changes in bowel habits are some of the first physical manifestations to occur with the disease, and these can persist.
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It isn’t uncommon for patients to notice rectal bleeding or blood in their stool either, which can change the colour of excrements.
When bleeding occurs inside the digestive tract it can make stool dark brown, maroon or black, depending on the location of the tumour.
Source: Daily Express
