Can bowel cancer be prevented?

Screening can find certain polyps before they become cancerous or detect cancer before symptoms appear.

Prevention aims to reduce the chance that cancer develops. Removing a precancerous bowel polyp is a direct preventive action because it removes tissue that could later change. Early detection finds an existing cancer sooner, when treatment may be less complex. Screening can contribute to both goals.

Risk is also shaped by factors a person cannot change. A strong family history and inherited conditions such as Lynch syndrome or familial adenomatous polyposis may require a personalised surveillance plan. Having a risk factor does not mean that cancer is inevitable.

Take part in bowel screening when invited and complete any recommended follow-up after an abnormal result. Tell your clinician about bowel cancer or multiple bowel polyps in close relatives, including the relative's age at diagnosis, because this can change when and how screening is offered.

Regular physical activity, maintaining a weight that supports your health, avoiding tobacco, limiting alcohol, and eating a varied diet rich in fibre-containing foods can support lower risk. These choices work together; none can guarantee prevention. Do not take aspirin or supplements solely for cancer prevention without clinical advice, as possible harms and benefits depend on your health history.

Screening is intended for people without symptoms. Contact a clinician if you notice blood in or on the stool, a persistent change in bowel habit, unexplained weight loss, ongoing abdominal pain, unusual tiredness, or a lump in the abdomen. Seek urgent care for heavy rectal bleeding, black stools with faintness, severe abdominal pain, or repeated vomiting.

Ask which screening method and schedule fit your age, family history, previous polyps, and medical conditions. If cancer has affected several relatives or occurred unusually early in the family, ask whether genetic counselling is appropriate and what information about relatives would help the assessment.