Introduction A cough is one of the body's natural defense mechanisms that helps clear mucus, irritants, allergens, and germs from the airways. Most coughs caused by common colds or viral infections improve within a week or two with adequate rest, hydration, and supportive care. However, when a cough continues for more than three weeks, it should never be ignored. A persistent cough can interfere with daily life, disturb sleep, cause chest discomfort, and sometimes indicate an