What is Bowel Cancer
Bowel cancer develops when abnormal cells in the colon or rectum grow in an uncontrolled way. The cells can form small growths called polyps, which can turn into cancer over time. Polyps are common and most do not develop into cancer. Also, not all bowel cancers develop from polyps. Bowel cancer can also be called colon, rectal or colorectal cancer depending on where the cancer starts
Who can be affected by Bowel Cancer
Bowel cancer affects men and women and is most often found in people who are 50 years and older. The chance of getting bowel cancer increases with age and in people with a family history of bowel cancer.
What are the risk factors for Bowel Cancer
Anything that can increase your risk is called a risk factor. Having one or more of these risk factors does not mean that you will develop bowel cancer. Some of these risk factors can't be changed (e.g. age) while others can (e.g. diet).
The risk factors for bowel cancer are:
- Being over 50 years old
- Having a close family member diagnosed with bowel cancer before 55 years old
- Having two or more close family members of the same side of your family who have had bowel cancer
- Having a known genetic bowel cancer syndrome in your family (such as familial adenomatous polyposis (FAP), Lynch Syndrome or other rare conditions)
- If you have previously had polyps (adenomas) in the bowel and close family members who have had polyps in the bowel
- Having inflammatory bowel diseases such as ulcerative colitis or Crohn’s disease.
Other risk factors that may increase the risk of bowel cancer:
- Being overweight or obese
- Tobacco smoking
- A low-fibre, high-fat diet
- A diet high in processed and red meat
- Drinking alcohol
What are the signs and symptoms of Bowel Cancer
There may be no warning signs that you have bowel cancer. Some signs and symptoms of bowel cancer may include:
- Bleeding from your bottom or blood in your faeces (poo)
- A change in your regular bowel habit that continues for several weeks (especially loose or more frequent poo)
- Abdominal pain, cramping or bloating
- Unexplained weight loss
- Unexplained tiredness or fatigue
Although these symptoms are usually caused by conditions other than cancer, it's important to get them checked by your doctor as soon as possible.
Diagnosis of Bowel Cancer
Bowel cancer may be identified after a screening test shows signs that you may have cancer, or after you visit your doctor with symptoms of bowel cancer (e.g. bleeding from the bottom). Usually the first test used to look for bowel cancer is called a colonoscopy. A colonoscopy is done using a long, thin, flexible tube containing a camera and a light to examine the entire length of the large bowel.
Other tests that may also be used to diagnose bowel cancer include a biopsy of the bowel (a tiny piece of tissue is taken to examine under the microscope), a sigmoidoscopy (internal examination of the lower part of the large intestine), CT scan or MRI scan (images taken of the bowel). Sometimes bowel cancer is diagnosed as a result of surgery of the bowel.
If bowel cancer is diagnosed, some more tests may be done to find out the stage of the disease and if it has spread anywhere else in the body. These tests may include a CT scan, MRI, ultrasound, chest X-ray, and lymph node biopsy.
What treatments are aviliable for Bowel Cancer
If you are found to have bowel cancer, you will be referred to a specialist. A team of health professionals will look after your care.
The treatment for bowel cancer depends on the type and stage (how far it has spread), the severity of the symptoms, your general health and preferences.
Polyps that may turn in to cancer can be removed during the colonoscopy (see diagnostic tests above). If cancer has not spread into the muscle of the bowel, no further treatment may be needed.
If cancer has spread beyond the bowel wall, the primary treatment is surgery to remove the tumour. The bowel walls will then be joined together. If it is not possible to join the bowel walls together, a special hole called a stoma will be made to the outside of the body. A colostomy bag will be attached to this hole to collect waste from the bowel.
In some cases, chemotherapy (medicines to destroy cancer cells) or radiotherapy (radiation to destroy cancer cells) may be recommended.
Some helpful websites
Bowel Cancer New Zealand
National Bowel Screening Programme