Obstructive lung illnesses such as asthma, bronchiectasis, and chronic obstructive pulmonary disease (COPD), which encompasses chronic bronchitis and emphysema, are all characterized by airway blockage. Because the bronchial tree is constricted owing to inflammation, the amount of air that may enter alveoli is limited. Symptoms of obstructive lung disease are frequently discovered and identified with pulmonary function tests like spirometry. Many obstructive lung illnesses are treated by avoiding triggers, using bronchodilators for symptom management, and suppressing inflammation in severe instances. Smoking is a significant cause of chronic bronchitis and emphysema, while serious infections and cystic fibrosis are common causes of bronchiectasis. Asthma has yet to be definitively identified