Bowel cancer prevention is an important part of looking after your long-term health. Bowel cancer, also known as colorectal cancer, is one of the most common cancers in Australia, and while it cannot always be prevented, there are practical steps that may help reduce your risk.
Prevention is not about one single habit, test, or procedure. It usually involves a combination of healthy lifestyle choices, being aware of your personal risk factors, taking part in bowel cancer screening when eligible, and seeking medical advice if you notice symptoms. For some people, prevention may also involve a colonoscopy, particularly when there is a positive bowel screening result, bowel symptoms, previous polyps, or an increased risk due to family or medical history.
Many bowel cancers develop slowly over several years. Some begin as small growths in the bowel lining called polyps. Not all polyps become cancer, but some types can develop into bowel cancer over time if they are not detected and removed. This is why early detection, screening, and appropriate investigation are so important.
In Australia, eligible people aged 45 to 74 can complete a free at-home bowel screening test every two years through the National Bowel Cancer Screening Program. People aged 45 to 49 can request their first free kit through the National Cancer Screening Register, while people aged 50 to 74 are generally sent a kit in the mail every two years.
For people in Melbourne who need further investigation, Direct Endoscopy provides colonoscopy in Melbourne across multiple locations, including Frankston, Hampton, Bayswater, Narre Warren and Rosebud.
Article index
- What is bowel cancer prevention?
- Why bowel cancer prevention matters
- Can bowel cancer be prevented?
- Bowel cancer risk factors
- Diet and bowel cancer prevention
- Red meat, processed meat and bowel cancer risk
- Fibre, wholegrains, fruit and vegetables
- Exercise and bowel cancer prevention
- Maintaining a healthy weight
- Alcohol, smoking and bowel cancer risk
- Screening and early detection
- Colonoscopy and polyp removal
- Family history and higher-risk patients
- Inflammatory bowel disease and bowel cancer prevention
- Symptoms not to ignore
- A practical bowel cancer prevention plan
- How Direct Endoscopy can help
- Final thoughts
What is bowel cancer prevention?
Bowel cancer prevention means taking steps that may reduce your chance of developing bowel cancer, while also improving the chance of detecting early changes before cancer becomes advanced. It includes lifestyle choices, bowel screening, awareness of symptoms, and appropriate medical follow-up.
Some risk factors for bowel cancer cannot be changed. These include age, family history, certain inherited conditions, and a previous history of bowel cancer or particular types of polyps. However, other risk factors are modifiable. These include diet, physical activity, body weight, alcohol intake and smoking.
Prevention also includes early detection. This is important because bowel cancer may not cause symptoms in its early stages. A person can feel well and still have early bowel changes. Screening can detect tiny traces of blood in the stool that may not be visible. A colonoscopy can then be used to examine the bowel and, in many cases, remove polyps before they become more serious.
It is useful to think of bowel cancer prevention in two ways. The first is reducing risk through everyday habits. The second is detecting and treating early changes through screening and medical investigation.
Why bowel cancer prevention matters
Bowel cancer is a significant health issue in Australia. Cancer Australia’s bowel cancer statistics show that thousands of Australians are diagnosed with colorectal cancer each year. Cancer Australia estimated that 14,784 new cases of colorectal cancer would be diagnosed in Australia in 2025.
Although these numbers are concerning, bowel cancer is often highly treatable when found early. The National Bowel Cancer Screening Program states that if bowel cancer is detected early, more than 90% of cases can be successfully treated.
This is why prevention and early detection matter so much. The aim is not only to reduce the risk of bowel cancer developing, but also to find warning signs early enough for effective treatment. For some people, the first sign may be a positive bowel screening result. For others, it may be a symptom such as rectal bleeding, a persistent change in bowel habits, unexplained tiredness, or iron deficiency.
Delaying investigation can allow a problem to progress. On the other hand, doing the screening test when eligible, speaking to your GP about symptoms, and following through with recommended investigations can make a major difference.
Can bowel cancer be prevented?
No cancer can be completely prevented in every person. Some people develop bowel cancer despite having a healthy lifestyle and no obvious risk factors. However, there are clear steps that may reduce risk and improve early detection.
Cancer Australia identifies bowel cancer risk factors including age, family history, inflammatory bowel disease, polyps, lifestyle factors such as diet, exercise, smoking and alcohol, and genetic factors.
This means bowel cancer prevention should be seen as a layered approach. A healthy diet may help reduce risk. Regular physical activity may help reduce risk. Avoiding smoking and limiting alcohol may help reduce risk. Screening helps detect early signs of bowel cancer. Colonoscopy can investigate symptoms or positive screening results and may allow polyps to be removed.
In short, prevention is not a guarantee, but it is still worthwhile. Even small changes made consistently over time may contribute to better bowel health and overall health.
Bowel cancer risk factors
Understanding your risk factors can help you know whether routine bowel screening is enough or whether you should speak with your GP about a more personalised approach.
Risk generally increases with age. This is one reason Australia’s national bowel screening program focuses on people aged 45 to 74. However, bowel cancer can occur in younger adults too, so symptoms should never be ignored simply because someone is under the screening age.
Your risk may be higher if you have a strong family history of bowel cancer, particularly if a close relative was diagnosed at a younger age. It may also be higher if you have previously had bowel polyps, previous bowel cancer, inflammatory bowel disease such as ulcerative colitis or Crohn’s disease affecting the colon, or certain inherited bowel cancer syndromes.
Lifestyle can also influence risk. A diet high in processed meats, excessive red meat intake, low fibre intake, physical inactivity, smoking, high alcohol intake and carrying excess body weight are all factors commonly discussed in bowel cancer prevention advice.
If you are unsure whether you are average risk or higher risk, speak with your GP. They can review your personal history, family history and symptoms, and advise whether you should participate in routine screening or be referred for specialist assessment.
Diet and bowel cancer prevention
Diet is one of the most important modifiable areas in bowel cancer prevention. While no single food can prevent bowel cancer, overall eating patterns matter.
A bowel-friendly eating pattern usually includes plenty of fibre-rich foods such as vegetables, fruit, legumes, wholegrains, nuts and seeds. It also means limiting processed meats and being mindful of red meat intake. A healthy diet can also support a healthier body weight, better blood sugar control, improved gut function and better general health.
Cancer Australia’s lifestyle risk guidance recommends consuming adequate dietary fibre, including unprocessed cereals and legumes, and aiming for five servings of vegetables and two servings of fruit per day. Cancer Australia also recommends limiting red meat to less than 500 grams per week and avoiding processed meat to reduce cancer risk.
For many people, bowel cancer prevention does not require a complicated diet. It may start with simple changes, such as adding vegetables to more meals, choosing wholegrain bread or cereal, replacing processed meats with lean proteins, eating legumes more often, and reducing takeaway or highly processed foods.
Red meat, processed meat and bowel cancer risk
Red meat includes beef, lamb, pork, veal, goat, venison and kangaroo. Processed meat includes foods that have been preserved by smoking, curing, salting or adding preservatives. This can include bacon, ham, salami, prosciutto, frankfurts and some sausages.
Cancer Council NSW states that there is strong evidence that eating red and processed meat increases the risk of bowel cancer. Bowel Cancer Australia also advises limiting red meat and avoiding or minimising processed meats as part of reducing bowel cancer risk.
This does not mean every person must become vegetarian. However, it does mean it is sensible to reduce the amount of processed meat in your diet and keep red meat intake within recommended limits. For example, instead of bacon or processed meats at breakfast, you might choose eggs, mushrooms, avocado, baked beans or wholegrain toast. Instead of processed meats in sandwiches, you might choose chicken, tuna, egg, hummus, falafel or salad-based fillings.
For people who eat red meat regularly, smaller portions and fewer red meat meals across the week can be a practical starting point. Replacing some meals with fish, chicken, legumes, tofu, eggs or other protein sources can help improve the overall balance of the diet.
Fibre, wholegrains, fruit and vegetables
Fibre plays an important role in bowel health. It helps keep bowel motions regular and supports a healthier gut environment. Fibre-rich foods also tend to be more filling, which can help with weight management.
Good sources of fibre include oats, wholegrain bread, brown rice, barley, lentils, chickpeas, beans, vegetables, fruit, nuts and seeds. Increasing fibre is often easier when done gradually. A sudden increase can cause bloating or discomfort in some people, so it may be better to increase fibre slowly and drink enough water.
Examples of practical fibre improvements include adding lentils to soups, choosing wholegrain breakfast cereal, adding chickpeas to salads, eating fruit as a snack, replacing white bread with wholegrain bread, and adding extra vegetables to curries, pasta sauces, stir-fries and rice dishes.
Dietary changes should also be realistic. The best prevention strategy is one that can be maintained long term. A diet does not need to be perfect to be helpful. Consistent improvements over time are more valuable than short-term extreme changes.
Exercise and bowel cancer prevention
Regular physical activity is another important part of bowel cancer prevention. Physical activity helps support a healthy weight, improves metabolic health, supports bowel function, and may reduce the risk of colon cancer.
Cancer Council Australia’s bowel cancer prevention policy identifies physical inactivity as a contributor to bowel cancer risk and highlights the role of lifestyle factors in prevention. Cancer Council NSW also lists being physically active as one of the key ways to reduce bowel cancer risk.
Exercise does not need to mean going to the gym every day. Walking, cycling, swimming, gardening, dancing, resistance training and team sports can all contribute. The key is to reduce long periods of sitting and build regular movement into your week.
For many adults, a practical starting point is a brisk walk most days of the week, combined with strength-based activity a couple of times a week. If you have not exercised for a long time, have a medical condition, or are unsure what is safe for you, speak with your GP before starting a new exercise program.
Maintaining a healthy weight
Maintaining a healthy weight can also help reduce bowel cancer risk. Excess body weight, particularly around the waist, has been linked with an increased risk of bowel cancer.
The most effective approach is usually not a short-term diet, but a sustainable pattern of eating and activity. This may include eating more fibre-rich whole foods, reducing highly processed foods, limiting sugary drinks, reducing alcohol, being physically active, and improving sleep routines.
For people who are carrying excess weight, even modest weight loss may have broader health benefits. It can also improve blood pressure, blood sugar control, joint pain, sleep quality and general energy levels.
If weight loss has been difficult, it may be worth discussing this with your GP or a dietitian. Support can make lifestyle changes more realistic and sustainable.
Alcohol, smoking and bowel cancer risk
Alcohol and smoking are also important in cancer prevention. Alcohol intake has been linked to several cancers, including bowel cancer. Smoking is also associated with a range of cancers and other serious health conditions.
If you drink alcohol, reducing the amount and frequency can support better health. This may mean having more alcohol-free days, choosing smaller servings, avoiding binge drinking, or replacing routine drinks with non-alcohol alternatives.
If you smoke, quitting is one of the best things you can do for your overall health. It can reduce your risk of many cancers and improve heart, lung and blood vessel health. Quitting can be difficult, but support is available through GPs, pharmacists, quit programs and nicotine replacement options where appropriate.
Bowel cancer prevention is not about blaming patients. Many factors contribute to cancer risk, and not all of them are controllable. However, reducing alcohol and avoiding smoking are practical steps that can improve long-term health.
Screening and early detection
Bowel cancer screening is one of the most important tools for early detection. The national screening test is designed for people who do not have symptoms. It looks for tiny traces of blood in the stool, which may be an early warning sign of bowel cancer or polyps.
Eligible Australians aged 45 to 74 can complete a free screening test every two years through the National Bowel Cancer Screening Program. People aged 45 to 49 can request their first kit through the National Cancer Screening Register. People aged 50 to 74 are generally mailed a kit every two years.
The test is completed at home and then posted to a laboratory. It is simple, private and does not require bowel preparation or sedation. If the result is negative, you should continue routine screening when due and still speak with your GP if symptoms develop. If the result is positive, you should follow up with your GP. A positive result does not mean you definitely have bowel cancer, but it does mean further investigation is needed.
In many cases, the recommended next step after a positive screening result is colonoscopy. This allows the bowel lining to be examined directly and can help identify the cause of bleeding.
Colonoscopy and polyp removal
A colonoscopy is a procedure that allows a specialist to examine the inside of the large bowel and rectum using a thin, flexible camera. It is commonly recommended after a positive bowel screening result, when bowel symptoms need investigation, or when a person is at increased risk due to personal or family history.
Colonoscopy can play an important role in bowel cancer prevention because it can detect polyps. In many cases, polyps can be removed during the procedure and sent for testing. Removing certain types of polyps may reduce the chance of those polyps developing into bowel cancer in the future.
Before a colonoscopy, you will need to complete bowel preparation so the bowel lining can be seen clearly. You can read more about this process on Direct Endoscopy’s colonoscopy preparation page.
It is important to understand that colonoscopy is not usually the first screening option for every average-risk person. The RACGP colorectal cancer screening guidance recommends immunochemical faecal occult blood testing every two years from age 45 to 74 for average-risk people and notes that colonoscopy is not generally recommended for screening people at average or slightly increased risk according to family history.
However, colonoscopy may be recommended when there is a positive screening result, concerning symptoms, previous polyps, inflammatory bowel disease, or higher-risk family history. If you have been referred for a colonoscopy, your GP or specialist can explain why it is appropriate for your situation.
Family history and higher-risk patients
Family history is an important part of bowel cancer prevention. If a close relative has had bowel cancer or advanced polyps, especially at a younger age, your own risk may be higher. The level of risk depends on how many relatives were affected, how closely related they are to you, and the age at which they were diagnosed.
The RACGP guidance on familial colorectal cancer notes that a comprehensive family history should be taken and regularly updated to identify patients who may be at risk of familial colorectal cancer.
If you have a family history of bowel cancer, do not rely only on general advice. Speak with your GP about your specific situation. You may need earlier screening, more frequent testing, colonoscopy surveillance, or referral to a specialist or family cancer clinic.
It is also helpful to know whether relatives had bowel cancer, bowel polyps, or a known inherited cancer syndrome. If possible, ask about the age at diagnosis and whether more than one family member was affected. This information can help your doctor assess your risk more accurately.
Inflammatory bowel disease and bowel cancer prevention
People with inflammatory bowel disease, including ulcerative colitis and Crohn’s disease affecting the colon, may need a more personalised bowel cancer prevention and surveillance plan.
Long-term inflammation in the colon can increase the risk of bowel cancer in some patients. The level of risk depends on several factors, including how much of the colon is affected, how long the condition has been present, how active the inflammation is, and whether there is a family history of bowel cancer.
If you have inflammatory bowel disease, it is important to follow the surveillance plan recommended by your gastroenterologist. This may involve colonoscopy at specific intervals even if you feel well. Routine home bowel screening may not be enough for people with known inflammatory bowel disease or ongoing bowel symptoms.
If your symptoms change, or you develop bleeding, unexplained weight loss, worsening diarrhoea or anaemia, speak with your GP or specialist promptly.
Symptoms not to ignore
Bowel cancer prevention is not only about lifestyle and screening. It is also about responding quickly to symptoms. Bowel cancer can sometimes cause symptoms, although early bowel cancer may have no symptoms at all.
Bowel Cancer Australia’s symptoms guide lists common symptoms such as blood in the stool, a persistent change in bowel habit, changes in stool shape or appearance, abdominal pain or cramping, unexplained weight loss, and signs of anaemia.
Speak with your GP if you notice:
- Blood in your stool or bleeding from the rectum
- A persistent change in bowel habits
- Ongoing diarrhoea, constipation, or a feeling that the bowel does not empty properly
- Unexplained abdominal pain, bloating or cramping
- Unexplained tiredness, weakness or iron deficiency
- Unexplained weight loss
- Narrower stools or a noticeable change in stool appearance
These symptoms do not always mean bowel cancer. They may be caused by haemorrhoids, infections, irritable bowel syndrome, inflammatory bowel disease, diverticular disease, diet changes or medication. However, symptoms should not be ignored, especially if they are new, persistent, unexplained or worsening.
If you have symptoms, do not wait for a routine bowel screening kit. Screening is designed for people without symptoms. Symptoms need medical assessment.
A practical bowel cancer prevention plan
Bowel cancer prevention can feel overwhelming if you try to change everything at once. It is usually easier to focus on a few practical steps and build from there.
1. Complete bowel screening when eligible
If you are aged 45 to 74 and eligible, complete the free bowel screening test every two years. If you are aged 45 to 49, you can request your first free kit through the National Cancer Screening Register. If you are aged 50 to 74, watch for the kit in the mail and complete it when it arrives.
2. Follow up positive screening results
A positive screening result does not mean you have bowel cancer, but it does need proper follow-up. Speak with your GP. A colonoscopy may be recommended to investigate the source of bleeding.
3. Know your family history
Ask your family whether any close relatives have had bowel cancer, advanced polyps, or related cancers. Share this information with your GP, especially if a relative was diagnosed at a younger age.
4. Improve your diet gradually
Add more fibre-rich foods such as vegetables, fruit, legumes and wholegrains. Reduce processed meats and keep red meat intake within recommended limits. Focus on sustainable changes rather than short-term dieting.
5. Move more and sit less
Build regular movement into your week. Walking, swimming, cycling, gardening and strength training can all help. If you sit for long periods, take regular movement breaks.
6. Limit alcohol and avoid smoking
Reducing alcohol and quitting smoking can support cancer prevention and improve overall health. If quitting smoking is difficult, ask your GP or pharmacist about support options.
7. Do not ignore symptoms
Speak with your GP if you notice rectal bleeding, persistent changes in bowel habits, unexplained abdominal pain, unexplained weight loss or iron deficiency. Symptoms should be investigated even if you are younger than the routine screening age.
How Direct Endoscopy can help
Direct Endoscopy provides specialist gastroenterology and endoscopy services across multiple Melbourne locations, including Frankston, Hampton, Rosebud, Narre Warren and Bayswater. You can view the full list of hospital locations on the locations page.
If your GP has recommended further investigation because of a positive bowel screening test, bowel symptoms, a family history of bowel cancer, previous polyps, or another risk factor, Direct Endoscopy can assist with timely assessment and colonoscopy services.
A colonoscopy can feel daunting, but it is a common procedure and an important tool in bowel cancer detection and prevention. During colonoscopy, the bowel lining can be examined carefully, and polyps may be removed if found. This can help identify problems early and reduce the risk of certain polyps developing into bowel cancer.
For more information about the procedure, you can read Direct Endoscopy’s guide on when to get a colonoscopy and how it works. If you are preparing for a procedure, you can also visit the colonoscopy preparation page.
Patients can visit the Direct Endoscopy book online page for more information about appointment options.
Final thoughts
Bowel cancer prevention is not about one single action. It is about combining healthy lifestyle choices, regular screening, symptom awareness, and appropriate medical follow-up.
You cannot control every risk factor, but you can take practical steps. Eat more fibre-rich foods. Limit processed meat. Stay active. Maintain a healthy weight. Reduce alcohol. Avoid smoking. Know your family history. Complete bowel screening when eligible. Speak with your GP if symptoms appear.
For some people, prevention also involves colonoscopy, especially when there is a positive bowel screening result, bowel symptoms, previous polyps, inflammatory bowel disease, or increased risk due to family history.
If you are concerned about bowel cancer risk or have been advised to have a colonoscopy, speak with your GP about the most appropriate next step.