The lungs are two organs found in your chest and form part of your respiratory system. This system is responsible for your breathing.

Lung cancer is when the cells in your lung change and start to grow out of control. These cells increase to form a tumour. Cells from this tumour may spread to other parts of the body.

Over 2000 people are diagnosed with lung cancer each year in Ireland.

Secondary cancer in the lung (lung metastases): sometimes cancer spreads to the lungs from somewhere else in your body. E.g. the breast or bowel. This is treated differently to cancer that starts in the lung (primary lung cancer).