Lung cancer develops in the tissues of the lungs and is often associated with smoking, air pollution,or occupational exposure. Early stages may show minimal symptoms. As the disease progresses,symptoms such as chronic cough, chest pain, breathlessness, fatigue, and coughing up blood mayappear. Diagnosis includes imaging tests, bronchoscopy, and biopsy. Treatment depends oncancer type and stage and may include surgery, chemotherapy, radiation therapy, immunotherapy,or targeted therapy. Early detection significantly improves outcomes.