A cough is a natural reflex action that helps clear the airways of irritants such as mucus, dust, smoke, or foreign particles. It is a protective mechanism of the body that helps keep the airways clear and ensures that thelungs and respiratory tract remain free from obstructions. Coughing can also help expel microbes or pathogens from the respiratory system. There are two main categories of cough: Acute Cough: This type lasts for a short duration, typically less than three weeks. It is often caused by viral infections (like the common cold or flu), allergies, or irritants.