The symptoms of lung cancer only appear in a late stage. These are persistent cough, blood in sputum, chest pain etc. The most prominent method for detecting lung cancer is by routine chest x-rays. Sputum examination may also reveal a lung cancer. It is to be noted that a lung cancer detected is never an early cancer. Even with the best methods of treatment, whether it is surgery, radiation or chemotherapy the survival rate is very poor. The most effective way to control lung cancer is by preventing its occurence by not smoking.