What is cancer?
Cancer refers to many different diseases but they are all due to cells growing too much, forming a tumour. The type of cancer is named according to the type of cell which is growing too much. As the tumour grows it destroys normal cells around the tumour and can break away to spread around the body. The cancer cells can spread to the lymph glands near the tumour and to other organs in the body. The stage of the cancer depends on the size of the tumour itself, whether lymph glands are affected and whether other organs are affected. Lung cancer starts from cells within the airway or lung.