What should you know about main cause of lung cancer?

Smoke from cigarettes and other tobacco products contains substances that can damage the genetic instructions controlling lung cells. Repeated exposure can allow abnormal cells to survive and multiply. Exposure to second-hand smoke, radon, asbestos, some workplace substances, and air pollution may also contribute. Risk can reflect several exposures together, and some people develop lung cancer without a clear exposure history.

A diagnosis is not a judgement about personal choices. The cause of an individual tumour often cannot be assigned with certainty. Testing may examine the tumour’s features to help guide treatment, while scans and tissue sampling establish what is present and how it behaves.

If you smoke, stopping can improve health at any stage; a clinician can discuss nicotine replacement, medicines, and support. Reduce exposure to tobacco smoke and follow workplace safety guidance when dust, fibres, fumes, or radiation may be present. Persistent cough, coughing blood, chest pain, breathlessness, unexplained weight loss, or a hoarse voice deserves medical review.

A clinician may arrange imaging, breathing assessment, or a biopsy when symptoms or findings warrant it. If lung cancer is confirmed, treatment choices can include surgery, radiotherapy, chemotherapy, or medicines selected from tumour information.

Seek emergency help for coughing a large amount of blood, severe breathlessness, blue lips, sudden confusion, or chest pain with collapse. New weakness, a seizure, or difficulty speaking also needs immediate assessment because cancer can sometimes affect the brain or other urgent causes may be present.

Could my work, home, or smoking history affect the assessment? Which tests are needed to identify the type and extent of a lung finding? Would tumour profiling change treatment choices, and what support is available to stop smoking?