Lung cancer is the leading cause of cancer death, with the most common type being bronchial carcinoma. The major types of lung cancer are epidermoid carcinoma (35%), adenocarcinoma (30%), large cell carcinoma (15%), and small cell lung cancer (20%). Symptoms vary depending on the location and spread of the cancer, but commonly include cough, hemoptysis, dyspnea, and chest or bone pain. Diagnosis involves sputum cytology, chest imaging like CT and x-ray, and biopsies. Treatment options include surgery for localized disease, chemotherapy and radiation for metastatic cancers, and palliative care.