A pulmonologist is a medical doctor who specializes in the field of pulmonology, which focuses on the respiratory system. Pulmonologists diagnose and treat conditions and diseases affecting the lungs and respiratory tract, such as asthma, chronic obstructive pulmonary disease (COPD), pneumonia, tuberculosis, lung cancer, and pulmonary hypertension. They are trained to perform procedures such as bronchoscopy, which involves examining the airways using a thin, flexible tube with a camera, and they may also interpret various pulmonary function tests to evaluate lung function. Pulmonologists often work closely with other healthcare professionals, including primary care physicians, respiratory therapists, and thoracic surgeons, to provide comprehensive care for patients with respiratory issues.