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Chronic Obstructive Pulmonary Disease (COPD) is a prevalent respiratory illness marked by long-lasting respiratory symptoms and restricted airflow. It typically manifests through symptoms like persistent cough, sputum production, and shortness of breath. The diagnosis relies on patient history, physical exams, and spirometry tests that assess lung function. Treatment options include ceasing smoking, using bronchodilators, corticosteroids, engaging in pulmonary rehabilitation, and in some cases, applying oxygen therapy or opting for surgery. While the prognosis depends on the disease's severity, early intervention can lead to better outcomes. Preventive measures focus on avoiding smoking and minimizing exposure to environmental pollutants and occupational hazards.