Respiratory disorder is a term that encompasses a variety of pathogenic conditions that affect respiration in living organisms. Respiration involves gas exchange in higher organisms. Respiratory disorders occur in the respiratory tract, which includes the alveoli, bronchi, bronchioles, pleura, pleural cavity, trachea and the nerves and muscles of breathing. Respiratory disorders or lung diseases include COPD, asthma, cystic fibrosis, emphysema, lung cancer, interstitial lung disease, mesothelioma, pulmonary hypertension, tuberculosis, alpha-1 antitrypsin deficiency, bronchiectasis, idiopathic pulmonary fibrosis, pneumonia, respiratory failure, respiratory distress syndrome, sarcoidosis, sleep apnea, sleep deprivation and deficiency, influenza and many more. If left untreated, lung disease can produce health complications and life-threatening conditions.