**1.13 Progression of acute sinusitis into asthma**

Acute sinusitis often begins with the symptoms of common cold. These symptoms may fade away in less than 4 weeks but if symptoms persist for more than 12 weeks despite of proper medical treatment then acute sinusitis is converted into chronic sinusitis. In chronic sinusitis airways get severely inflamed with either bacterial or viral infection, which leads to the development of asthma. Which is known as sinusitis related asthma [21, 22].
