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The Link between Asthma and COPD
While asthma and chronic obstructive pulmonary disease (COPD) are both chronic lung diseases, they have some key differences in their causes, risk factors, symptoms, and treatments. Both conditions cause difficulty breathing, but they develop and progress in distinct ways. Some people may even have features of both Asthma and COPD over the course of their lives. Understanding the distinctions between these illnesses can help people recognize risk factors and work with their doctors to better manage their condition.
What is Asthma?
Asthma is a chronic inflammatory disease of the airways. People with asthma have inflamed and hyper responsive airways that are overly sensitive to triggers like allergens, cold air, exercise, or respiratory infections. When exposed to triggers, the muscles around the airways tighten, the inner lining swells, and mucus production increases, leading to symptoms like wheezing, chest tightness, coughing, and shortness of breath. Asthma episodes, or exacerbations, can range from mild to life-threatening. Over 18 million Americans currently have asthma, including many children.
Genetics and environmental exposures both play a role in developing asthma. Having a family history of allergies or asthma increases risk. Exposure to tobacco smoke, air pollution, or indoor allergens like dust mites or pet dander during development or early life makes it more likely someone will get asthma. Symptoms of asthma tend to come and go based on trigger exposure and can be controlled through long-term maintenance treatment with inhaled corticosteroids, long-acting bronchodilators, and quick-relief medication during flare-ups.
What is COPD?
COPD refers to a group of progressive lung diseases, most commonly emphysema and chronic bronchitis, which are not fully reversible. The primary risk factor for COPD is tobacco smoke, either from direct smoking or long-term secondhand smoke exposure. Cigarette smoking accounts for the vast majority of COPD cases. Other exposures like chemical fumes and pollution that damage the lungs over many years may also contribute to COPD risk.
Unlike asthma, COPD develops slowly and the lung damage from COPD is not fully reversible. As COPD progresses, less air can flow in and out of the lungs and their ability to retrieve oxygen from inhaled air declines. Chronic mucus hypersecretion and destruction of lung tissue from COPD limit airflow, resulting in shortness of breath that worsens over time. Symptoms of COPD include increased breathlessness, chronic cough, wheezing, and tightness in the chest. Lung function declines steadily and does not improve significantly during periods without symptoms.
Symptom Overlap and Management of Asthma and COPD
Some people diagnosed with asthma will go on to develop features of COPD from continued smoking or environmental exposures. Others may have COPD along with a history of childhood asthma. In either of these cases, distinguishing features of both conditions may be present. Symptoms like wheezing are common to both, while chronic cough without wheezing tends to indicate COPD rather than asthma alone. Spirometry lung function tests before and after bronchodilation can help doctors differentiate the two through the extent of improvements seen.
Management of asthma aims to control symptoms through preventative treatment and control of triggers. Asthma and COPD treatment focuses on reducing symptoms like dyspnea, improving quality of life, and preventing complications through pulmonary rehabilitation, smoking cessation support, vaccinations, and medications for lung function and inflammation. Understanding the root causes of any breathing issues people face is key to developing targeted treatment strategies and lifestyle modifications. This helps optimize lung health outcomes over the long term.
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