Now a day, one of the major reasons for non-accidental death is the cancer. Lung cancer is uppermost cause of cancer death in all over world. It’s possible to reduce the ratio of death if persons are aware for early detection by which appropriate treatment can be done by the doctors within some safe duration. When a group of cells becomes irregular growth uncontrollably and lose balance to make malignant tumours that is invades surrounding tissues, termed as cancer. It can be classified mainly into two parts Non-small cell lung cancer (NSCLC) and small cell lung cancer (SCLC). The symptoms, diagnosis and treatments are also discussed here