Asthma cough symptoms
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Asthma Cough Symptoms: Prevalence and Clinical Importance
Cough is a very common and often troublesome symptom in people with asthma. It can be the main or even the only symptom in some patients, especially in forms like cough variant asthma, where wheezing may not be present at all Zhou2022Turcotte2011Tepetam2020. Studies show that cough is frequently reported alongside other classic asthma symptoms such as wheezing, breathlessness, and chest tightness, with combinations of these symptoms affecting the majority of asthma patients .
Cough Severity and Its Impact on Asthma Control and Quality of Life
Research highlights that cough severity is closely linked to poor asthma control and a lower quality of life. Patients with severe asthma often rate their cough as more severe than their wheezing, and higher cough severity is associated with worse scores on asthma control tests and quality of life questionnaires Lee2024Lee2023Holmes2022. In fact, many patients consider cough to be one of the most bothersome asthma symptoms, sometimes even more so than wheezing or breathlessness . Patients are often willing to tolerate other symptoms if it means reducing their cough .
Cough Frequency and Objective Monitoring
Objective monitoring of cough frequency shows that people with uncontrolled asthma cough more often than those with controlled asthma. Cough frequency is an independent indicator of asthma control, separate from measures of airway inflammation or airflow obstruction . This means that even if lung function tests or inflammation markers are normal, frequent coughing can still signal poor asthma control .
Cough Phenotypes in Asthma: Classic, Cough Variant, and Cough Predominant
Asthma can present in different ways, with some patients experiencing cough as the main symptom (cough variant asthma or cough predominant asthma), while others have more classic symptoms like wheezing and breathlessness Zhou2022Turcotte2011Tepetam2020. Cough variant asthma is often underdiagnosed because it lacks wheezing, and the cough can be persistent, sometimes occurring day and night and lasting for months or years . These different phenotypes can be distinguished by the presence of laryngeal symptoms, cough sensitivity, and the degree of airflow obstruction, but not necessarily by airway inflammation or comorbidities .
Mechanisms and Treatable Traits of Asthma-Related Cough
The mechanisms behind cough in asthma are complex and can involve airway inflammation, bronchoconstriction, and increased sensitivity of the cough reflex (cough hypersensitivity) Turcotte2011Lai2023. Cough hypersensitivity may cause symptoms like throat irritation and an exaggerated response to triggers. While inhaled corticosteroids and bronchodilators can help with cough related to inflammation and bronchoconstriction, cough hypersensitivity may require other treatments, such as speech therapy or neuromodulator medications .
Cough as a Predictor of Exacerbations and Disease Burden
Frequent or productive cough in asthma is linked to a higher risk of future asthma attacks (exacerbations) and a greater overall symptom burden . Patients with frequent cough are more likely to experience worsening symptoms and require more medical attention, including hospital admissions .
Conclusion
Cough is a key symptom of asthma that can occur alone or with other symptoms. It is often severe, impacts quality of life, and is a strong indicator of poor asthma control and future risk. Recognizing and addressing cough as a distinct and treatable trait in asthma is important for better management and improved patient outcomes Lee2024Lee2023Marsden2016+2 MORE.
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