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Bowel cancer may develop the following symptoms:
Blood or mucus (or both) in the bowel movements;
Unexplained changes in bowel habit lasting more than two weeks, such as constipation or diarrhoea or both;
Persistent “colicky pain” in the abdomen;
Tiredness or paleness from anaemia.
Sometimes, symptoms may appear only after the cancer has spread. However, in many cases, the above mentioned symptoms do not mean cancer; but tests may be needed to make sure. The older you are, the more likely that these symptoms could mean cancer.