As part of a series on lung diseases, HealthCentral interviewed Bindu Akkanti, MD, about corticosteroids for COPD (external link) treatment; Pushan Jani, MD, about how allergies (external link) can worsen COPD; and Guatam Sikka, MD, about the differences in lungs (external link) with COPD, and why asthma coughs can have a metallic taste (external link).