Lung cancer is one of the most common and deadly forms of cancer, often caused by smoking or exposure to secondhand smoke. Dr. Mayank highlights that symptoms include a persistent cough, weight loss, and blood in sputum. Early detection through imaging tests and biopsies improves treatment outcomes. Depending on the stage, treatment may involve surgery, radiation, chemotherapy, or targeted therapies. Smoking cessation and avoiding environmental pollutants are key preventive measures.