(COPD), also known as chronic obstructive lung disease (COLD), and chronic obstructive airway disease (COAD), among others, is a type of obstructive lung disease characterized by chronically poor airflow.It typically worsens over time.
Chronic obstructive pulmonary disease (COPD) is a progressive lung disease that makes it difficult to breathe. “Progressive” means that the disease gets worse over time. Approximately 12 million people in the United States have been diagnosed with COPD.  COPD, or chronic obstructive pulmonary (PULL-mun-ary) disease, is a progressive disease that makes it hard to breathe. Progressive means the disease gets worse over time. COPD can cause coughing that produces large amounts of mucus (a slimy substance), wheezing, shortness of breath, chest tightness, and other symptoms. Cigarette smoking is the leading cause of COPD. Describes how COPD, or chronic obstructive pulmonary disease, is a progressive disease that makes it hard to breathe. Details the symptoms of COPD. Shows how the disease works in the lungs. Explains how progress of the disease can be slowed. Progressive means the disease gets worse over time. COPD can cause coughing that produces large amounts of mucus (a slimy substance), wheezing, shortness of breath, chest tightness, and other symptoms. Cigarette smoking is the leading cause of COPD. Chronic Obstructive Pulmonary Disease (COPD) is an umbrella term used to describe progressive lung diseases including emphysema, chronic bronchitis, refractory (non-reversible) asthma, and some forms of bronchiectasis. This disease is characterized by increasing breathlessness.  Chronic obstructive pulmonary disease (COPD), also known as chronic obstructive lung disease (COLD), and chronic obstructive airway disease (COAD), among others, is a type of obstructive lung disease characterized by chronically poor airflow. It typically worsens over time. COPD is a type of obstructive lung disease in which chronic incompletely reversible poor airflow (airflow limitation) and inability to breathe out fully (air trapping) exist. The poor airflow is the result of breakdown of lung tissue (known as emphysema) and small airways disease (known as obstructive bronchiolitis). COPD is a lung disease that makes it hard to breathe. It is caused by damage to the lungs over many years, usually from smoking. COPD is often a mix of two diseases: 1  Chronic bronchitis (say bron-KY-tus). 2  In chronic bronchitis, the airways that carry air to the lungs (bronchial tubes) get inflamed and make a lot of mucus. 3  This can narrow or block the airways, making it hard for you to breathe. 4  Emphysema (say em-fuh-ZEE-muh). COPD, or chronic obstructive pulmonary disease, is a lung disease that causes coughing, wheezing, shortness of breath, and other symptoms. COPD is a major cause of disability and the third leading cause of death in the United States. More than 10,000 volunteers from across the country are taking part in COPDGene. Describes how COPD, or chronic obstructive pulmonary disease, is a progressive disease that makes it hard to breathe. Details the symptoms of COPD. Shows how the disease works in the lungs. COPD, or chronic obstructive pulmonary disease, is a lung disease that causes coughing, wheezing, shortness of breath, and other symptoms. COPD is a major cause of disability and the third leading cause of death in the United States. Progressive means the disease gets worse over time. COPD can cause coughing that produces large amounts of mucus (a slimy substance), wheezing, shortness of breath, chest tightness, and other symptoms. Cigarette smoking is the leading cause of COPD. Chronic Obstructive Pulmonary Disease, or COPD, refers to a group of diseases that cause airflow blockage and breathing-related problems. It includes emphysema, chronic bronchitis, and in some cases asthma. 
http://www.healthline.com/health/copd http://www.nhlbi.nih.gov/health/health-topics/topics/copd/ http://www.nhlbi.nih.gov/health/health-topics/topics/copd/ http://www.copdfoundation.org/What-is-COPD/Understanding-COPD/What-is-COPD.aspx https://en.wikipedia.org/wiki/Chronic_obstructive_pulmonary_disease http://www.webmd.com/lung/copd/tc/chronic-obstructive-pulmonary-disease-copd-overview http://www.nhlbi.nih.gov/health/health-topics/topics/copd/names http://www.nhlbi.nih.gov/health/health-topics/topics/copd/ http://www.cdc.gov/copd/index.html
what is copd disease