Respiratory medicine is a medical sub-specialty that focuses on the diagnosis and management of diseases affecting the respiratory system, including asthma, chronic obstructive pulmonary disease (COPD), tuberculosis, HIV infections with opportunist infections, pneumonia, and lung cancer. Specialists in this field utilize various diagnostic techniques, such as pulmonary function tests like spirometry, endoscopy such as bronchoscopy and imaging studies, to develop tailored treatment plans aimed at improving lung function and overall respiratory health.