Chronic obstructive pulmonary disease (COPD) is the name for a collection of lung diseases including chronic bronchitis, emphysema and chronic obstructive airways disease. The main symptom of COPD is an inability to breathe in and out properly. This is also referred to as airflow obstruction.
NHS
Guide to the symptoms, diagnosis, treatment and risks of COPD from the NHS
British Lung Foundation
Information and guidance on living with COPD