Lung cancer is a serious disease that occurs when abnormal cells in the lungs grow uncontrollably. These cells can form tumors, which may interfere with normal lung function. The two main types of lung cancer are non-small cell lung cancer and small cell lung cancer, with non-small cell being the most common. Smoking is the leading cause, but other factors like air pollution and asbestos exposure can also increase risk. Symptoms of lung cancer often include a persistent cough, chest pain, and difficulty breathing. Early detection is crucial for better treatment outcomes, which may involve surgery, radiation therapy, or chemotherapy. Regular check-ups and avoiding risk factors can help reduce the chances of developing this disease.