What should you know about the causes of non-small cell lung cancer?

NSCLC begins when cells in the lung gain changes that affect growth and repair. Tobacco smoke is a major preventable exposure, but people who have never smoked can also develop this cancer. Second-hand smoke, radon, some workplace substances, air pollution, and previous chest radiation may contribute in particular circumstances. Risk is shaped by the combination and duration of exposures rather than one event alone.

A tumour’s molecular changes can differ from one person to another. These changes are not automatically inherited from a parent; many arise during a person’s lifetime. Testing tumour tissue or blood may identify alterations that help the team select treatment, but a detected alteration does not necessarily explain exactly why the cancer began.

Tell the clinician about smoking or vaping, second-hand smoke, work exposures, radon concerns, previous radiation, family cancer history, and relevant medical conditions. This history helps frame testing, although it cannot prove causation. Diagnosis and staging may involve scans, a biopsy, and laboratory assessment of tumour features.

If NSCLC is confirmed, treatment is matched to its type, location, spread, symptoms, and molecular findings. Options can include surgery such as lung lobectomy, focused radiation, immunotherapy, or targeted therapy. Stopping tobacco exposure can support breathing and treatment planning at any stage.

Arrange medical assessment for a cough that persists or changes, coughing blood, unexplained breathlessness, chest pain, repeated chest infections, or unexplained weight loss. These symptoms have many possible causes and do not by themselves establish lung cancer. Seek urgent help for severe breathing difficulty, large-volume bleeding, blue lips, or sudden confusion.

What risk factors are relevant in my history? Which tests will confirm the diagnosis and stage? Will the tumour be tested for molecular changes, and how would those results affect treatment? Should my household or workplace be checked for an exposure such as radon?