Cancer screening in Ontario: what is offered and when

Screening means testing for a cancer before there are any symptoms. Ontario runs organised programs and will send invitations and reminders, but you do not have to wait for a letter — you can ask a primary-care provider, and some tests can be arranged without one.

The programs

• Colorectal: most people aged 50–74 at average risk do a free at-home stool test (FIT) every two years. People with a family history may start earlier with a colonoscopy.
• Breast: people aged 50–74 at average risk are screened with a mammogram, generally every two years; those 40–49 can now self-refer in Ontario.
• Cervical: screening is offered from age 25 for people with a cervix who have ever been sexually active; Ontario is moving to HPV-based testing.
• Lung: a program for people aged 55–74 with a significant smoking history uses low-dose CT scans.

Exact ages and intervals change as guidelines are updated — confirm current details with Ontario Health or a clinician.

Between screens: know your body

Screening does not replace paying attention. See someone promptly about a new or changing lump, a mole that changes, unexplained bleeding or weight loss, a persistent cough or hoarseness, a change in bowel or bladder habits, or a sore that will not heal.

Why early detection is the whole point

Many cancers found early — before they have spread — can be treated successfully and with less aggressive treatment. The same cancer found late is harder to treat and harder on the person. A stool test in a drawer or a booked mammogram is a small task with a large payoff.

Sources

• Ontario Health (Cancer Care Ontario) — Cancer screening
• Canadian Cancer Society — Screening in Canada