Cough
An irritation of the airway gives rise to the natural cough reflex as the pressure in the chest builds up when there is mucus production in the airway tubes. Cough is the most common symptom in bronchitis, both acute and chronic. In acute bronchitis, patients complain from a persistent cough lasting a few weeks, and in chronic type, patients continue coughing for months and longer, depending on the severity of the disease.