What should you know about lung cancer screening?

Screening is intended for people with a sufficiently high risk of lung cancer, based on factors such as age, smoking history and current health. Eligibility rules vary by programme and can change, so a clinician should assess whether screening is appropriate for you.

Screening commonly uses a low-dose CT scan rather than waiting for symptoms. It may find a nodule or other change that is not cancer, leading to repeat imaging or further tests. A clear screening scan does not rule out future disease, and screening is not a substitute for reporting new symptoms.

Tell your clinician about current or past smoking, occupational exposures, previous scans, lung conditions and family history. Ask which programme is available, how often imaging is offered and how an unexpected finding will be followed. Bring earlier scan reports when possible so images can be compared.

If you smoke, support to stop can reduce ongoing harm and can be discussed whether or not you qualify for screening. Screening decisions should include the possible value of earlier detection, the chance of false alarms and the practical steps after an abnormal result.

Do not wait for a screening appointment if you develop persistent cough, coughing blood, chest pain, breathlessness, unexplained weight change or a hoarse voice. Contact a clinician for assessment. Severe breathing difficulty, blue lips, sudden confusion or collapse requires emergency help.

Ask whether you meet local eligibility criteria, what scan method is used, what happens after an abnormal image, how smoking support fits the plan, and how screening differs from investigating symptoms.