Bronchitis occurs when the air passages in your lungs become inflamed. Bronchitis can be acute or chronic. Acute bronchitis is usually due to a viral infection — such as a cold — that starts in your nose or sinuses and spreads to the airways.
Usually a virus but can also be cause by bacteria. Some viruses associated with bronchitis include rhinovirus, parainfluenza, influenza A and B and coronavirus.
Signs and symptoms:
Usually a non productive cough, with or without fever, chest pain with breathing, heavy sensation on chest.
Diagnosis: chest x-ray and or sputum culture