Lung cancer often has no symptoms in the early stages and may be picked up by chance on a chest X-ray. The first symptom you might notice is a cough. If you smoke and have chronic bronchitis, you may already have a continual cough and the first alarm may be a change in the cough(eg from dry to chesty) or a change in the colour of your phlegm(sputum).If you develop blood-stained phlegm, see your doctor. Other symptoms include chest aches, shortness of breath, unexplained weight loss, finger clubbing(broadening or thickening of the tips of the fingers), hoarse voice, swollen glands(lymph nodes) around the neck or even shoulder pain.
Attribution: BUPA