What is COPD?  How do bronchitis, asthma, and emphysema "fit" with COPD?  What causes COPD?  What are the symptoms?  How is COPD diagnosed?  Can a patient have COPD and not know it?  How is the condition treated?   Dr. Bradley Hayward, an Instructor in Medicine at Weill Cornell, will discuss these questions.  Dr. Hayward is board-certified in Critical Care Medicine, Pulmonary Medicine, and Palliative Medicine.