This deals with pulmonary vascular diseases related to respiratory organs like the bronchus, lungs, and pleura. It particularly takes care of infectious diseases like pneumonia, tuberculosis, and bronchiectasis, chronic obstructive pulmonary diseases like asthma, pulmonary emphysema, and chronic bronchitis, intrathoracic neoplasms like lung cancer and mediastinal tumor, other pleura diseases, pulmonary fibrosis, interstitial lung disease, and sleep apnea (a disease that comes with snoring and apnea for longer than 10 seconds during sleep).