The causes

The causes of colorectal cancer are largely unknown. However, a number of factors are believed to increase the risk of getting the condition.

  • Diet: It is thought that a diet high in animal fat and protein, and low in fibre, may increase the risk of developing colorectal cancer.

  • Lifestyle factors: Obesity, lack of exercise, smoking and excessive alcohol consumption may also increase the risk of developing this cancer.

  • Family history: People with a family history of colorectal cancer may have an increased risk of developing the condition. Those who have more than one family member diagnosed with colorectal cancer, or whose parents or siblings developed colorectal cancer under the age of 45, also have a higher risk.

The symptoms

If you notice any of the following symptoms, consult your doctor immediately. However, you should note that having these symptoms does not necessarily mean that you have cancer.

  • Blood or mucus in your stools

  • Changes in bowel habits lasting more than two weeks

  • General abdominal discomfort (gas, pain, bloating, fullness or cramps)

  • Unexplained weight loss

  • Constant tiredness or feeling weak

Colorectal cancer may also cause ileus (an inability of the muscles in the large bowel to push along digested food). The symptoms of this include constipation, abdominal pain and bloating.

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