Generally, the process of being diagnosed with lung cancer is as follows:
An X-ray and a computerised tomography (CT) scan (where your body is X-rayed at a number of angles before a computer puts together a detailed image) of your chest will first be done to show if there is a lung tumour. Your doctor may confirm the diagnosis of cancer by taking some samples of the cells from your tumour and testing them (this is called a biopsy).