Diseases

Colorectal Cancer: Warning Signs

Updated 2026-06-094 min read

Early-stage colorectal cancer can be silent. Recognising warning signs and timely colonoscopy improve the chance of early diagnosis.

Warning signs

Persistent change in bowel habit
Blood in stool or rectal bleeding
Unintentional weight loss
Persistent abdominal discomfort or sensation of incomplete evacuation
Iron-deficiency anaemia of unclear cause

Who is at higher risk?

Family history of colorectal cancer or polyps
Personal history of inflammatory bowel disease
Certain hereditary syndromes
Advancing age

Role of colonoscopy

Colonoscopy can identify lesions and allow biopsy or removal of polyps. Screening intervals are individualised based on findings and risk factors.

This page is for general information only

The content here is not a diagnosis or treatment recommendation and does not replace an individual medical evaluation. If your symptoms persist, consult a physician. In emergencies call 112 or the nearest emergency department.

Symptoms Treatments FAQ

Frequently asked questions

Can young adults develop colorectal cancer?

Although risk rises with age, younger adults can also be affected, particularly with a family history.

Is rectal bleeding always cancer?

No. Most bleeding is from benign causes, but evaluation is still important.