Asthma is a respiratory condition marked by spasms in the bronchi of the lungs, causing difficulty in breathing, wheezing, breathlessness, chest tightness, and coughing. It usually results from an allergic reaction or other forms of hypersensitivity.
                                
                                
                                                            
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COPD (Chronic obstructive pulmonary disease) is a chronic inflammatory lung disease that causes obstructed airflow from the lungs. It's caused by long-term exposure to irritating gases or particulate matter such as cigarette smoke. Symptoms of COPD include breathing difficulty, chest tightness, cough, mucus (sputum) production and wheezing. People with COPD are at increased risk of developing heart disease, lung cancer and a variety of other conditions.
                                
                                
                                                            
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A cough is a common reflex action that clears the throat of mucus or foreign irritants. Coughing to clear the throat is typically an infrequent action, although a number of conditions can cause more frequent bouts of coughing.
                                
                                
                                
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