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Why can a persistent cough be a symptom of some cancers?
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cancer
View through an endoscope of a polyp, a benign precancerous growth projecting from the inner lining of the colon.
A persistent cough can be a symptom of certain cancers, particularly those affecting the respiratory system, such as lung cancer.12
In the context of respiratory disease, a cough is a natural reflex triggered by irritation in the respiratory tract. When malignant tumors develop in the major airways or lungs, they can cause a persistent cough through several mechanisms:3
- Airway Irritation: Tumors may directly irritate the bronchial tree or extend into it from nearby organs, triggering an irritative cough.1
- Obstruction and Secretions: Malignant diseases can lead to the production of sputum or cause obstructions that the body attempts to clear through the cough reflex.1
- Underlying Conditions: Lung cancer may develop in individuals who already have chronic conditions like bronchitis, which are themselves associated with long-term coughing.2
Because a cough is a nonspecific symptom that can result from various infections or environmental irritants, any cough lasting longer than a few weeks warrants medical attention to rule out serious underlying conditions.31