Cancer screening involves testing people who may be at risk for cancer but do not have any symptoms and generally feel well.
In this section
- Lung cancer can occur anywhere in the lungs, from the bronchus – which brings air in – to the pleura – the thin tissue that covers the lungs and lines the chest cavity – and anywhere in between.
- There are two main types of lung cancer: non-small cell lung cancer (NSCLC), which accounts for 80-85% of cases, and small cell lung cancer (SCLC), which accounts for the rest.
- Lung cancer is slightly more common in men than in women.
- About half of lung cancer cases are diagnosed at a late stage. At later stages, lung cancer is harder to treat.
- Screening can help find lung cancer early when it is more likely to be treated successfully.
Who should be screened for lung cancer?
Cancer screening is done on people who may be at risk of getting lung cancer. In Ontario, people aged 55-80 with a smoking history may be referred. A risk assessment will be completed to determine eligibility
How we screen for lung cancer
Wondering if you fit the criteria for lung cancer screening, or looking for help reducing your risk factors? Talk to a Certified Respiratory Educator or Certified Smoking Cessation Counselor through our Lung Health Line.
For more information please email us a patientsupport@lunghealth.ca or call us at 1-888-344-LUNG (5864).

What to expect during a lung cancer screening test
First, you’ll change into an exam gown and lie on the able of the CT machine, with your arms raised above your head. The table will slowly pass through the centre of the machine.
You will be asked to lay still, and may be asked to hold your breath at times. Both ends of the machine will be open, and the technician performing the scan will be able to see and hear you at all times. In most cases, the scan takes just a few minutes.
Why screening matters
- Because 70% of Canadian lung cancer cases are diagnosed at a late stage (stage III or stage IV). With proper screening protocols in place, we could detect lung cancer in its earlier, more treatable stages.
- Regular screening is important because it can find lung cancer early when treatment has a better chance of working.
If someone is at high risk of getting lung cancer, getting screened regularly can greatly lower their risk of dying from lung cancer
What we’re doing about it
The Lung Health Foundation is advocating for coast-to-coast publicly organized lung cancer screening programs. Only three provinces, Ontario, British Columbia and Nova Scotia, have formally adopted such a program. Meanwhile, several other provinces utilize opportunistic screening (screening outside of an organized program, triggered by a healthcare provider)
What comes after screening?
Remember, a “positive” screening result doesn’t necessarily mean that you have lung cancer – but getting answers is important. The sooner you know, the sooner you can act.
If a small growth was spotted, your next steps may include returning for another low-dose CT scan to check for any changes. If your health-care provider spots something more suspicious, you will need further testing, like a biopsy or PET scan.

Lung Cancer Screening
“Screening” means checking for cancer before symptoms develop, even if you feel healthy. Screening can help detect cancer in its earliest stages.

Diagnosis and Staging
Being diagnosed with lung cancer is often life-changing, and emotional distress is common. Understanding the steps and procedures can help you feel more in control, prepare you to advocate for yourself during your treatment.

Navigating Your Lung Cancer Care
The cancer care system can seem overwhelming at first, but we’re here to help you navigate it in a way that makes you feel empowered and supported.

Treatment
Your treatment team will consider a number of factors when choosing treatments that will fight your cancer most effectively. They will consider your overall health, age, and personal situation.

Questions and Answers About Coping with Lung Cancer
The questions we list here are the top coping questions reported by people with lung cancer. Our answers provide some basic information, but we encourage you to discuss any concerns or questions with your oncologist and other members of your cancer care team.
