Respiratory diseases associated with chronic cough
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Chronic Cough and Respiratory Diseases: Prevalence and Key Conditions
Chronic cough, defined as a cough lasting eight weeks or longer, is a common symptom across many respiratory diseases and significantly impacts patients' quality of life and disease severity 124. The most frequently associated respiratory diseases include asthma, chronic obstructive pulmonary disease (COPD), bronchiectasis, interstitial lung disease (ILD), and sarcoidosis 1247. Prevalence rates of chronic cough in these conditions vary widely: asthma (8–58%), COPD (10–74%), bronchiectasis (82–98%), ILD (50–89%), and sarcoidosis (3–64%) .
Other notable causes of chronic cough include cough variant asthma, sinobronchial syndrome, atopic cough, gastroesophageal reflux disease (GERD), eosinophilic bronchitis, post-nasal drip syndrome, and rhinosinusitis 2457. In some cases, chronic cough may be unexplained, termed idiopathic or refractory chronic cough 19.
Impact of Chronic Cough in Respiratory Diseases
Chronic cough in respiratory diseases is linked to worse health outcomes, including increased symptom burden, more severe disease, higher frequency of exacerbations, and even increased mortality, particularly in conditions like idiopathic pulmonary fibrosis 138. In COPD, chronic cough is associated with more respiratory symptoms (such as sputum production, wheezing, and dyspnea), lower lung function, increased inflammation, and greater health-care utilization 138. Individuals with chronic cough also face higher risks of COPD exacerbations, pneumonia, and all-cause mortality, independent of smoking status and airflow limitation .
Pathophysiology and Mechanisms: Cough Reflex and Hypersensitivity
Chronic cough is often associated with heightened cough reflex sensitivity or cough reflex hypersensitivity, which has been observed in asthma, COPD, bronchiectasis, ILD, and sarcoidosis 14. Changes in airway nerves and inflammation can enhance the cough reflex, sometimes persisting even after the initial cause is removed . However, the mechanisms underlying chronic cough in these diseases are not fully understood, and more research is needed to develop targeted therapies 14.
Psychological and Social Burden of Chronic Cough
Chronic cough in respiratory diseases is strongly associated with psychological comorbidities, including higher rates of depression and anxiety compared to patients without chronic cough . The severity of cough correlates with worse health status and greater psychological distress, highlighting the need for holistic management approaches that address both physical and mental health .
Risk Factors and Comorbidities
Asthma, persistent smoking, and lower socioeconomic status are consistently identified as risk factors for chronic cough . Chronic cough is also associated with comorbidities such as obesity, depression, hypertension, and cardiovascular disease, even in cases where no major underlying respiratory condition is identified . Environmental exposures, such as cigarette smoke and air pollution, are additional contributors 46.
Diagnosis and Management Strategies
Accurate diagnosis of the underlying cause is crucial for effective management, as treating the primary disease often leads to significant improvement in cough symptoms 2457. Diagnostic approaches include clinical evaluation, imaging, and sometimes multidisciplinary assessment, especially when the cause is unclear 27. In cases where the cough is refractory or unexplained, symptom management and desensitization of cough pathways may be considered .
Conclusion
Chronic cough is a prevalent and burdensome symptom in a range of respiratory diseases, most notably asthma, COPD, bronchiectasis, ILD, and sarcoidosis. It is associated with worse disease outcomes, increased psychological distress, and a higher risk of comorbidities and mortality. Understanding the underlying mechanisms and improving diagnostic and management strategies remain key priorities to enhance patient quality of life and health outcomes 1234+6 MORE.
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