Prime objective of this article is to explain general symbols of a Sinus Infection. There are varieties of sinus infections: acute, subacute, frequent, and chronic. Mostly they differ on how long they last and how often the symptoms come back. Sinus infections or the correct medical term, sinusitis, happens when the sinus tissues swell or perhaps get inflamed. It can be be extremely painful for sufferers. Generally, it happens when sinuses get blocked. Germs and bacteria subsequently grow and cause the infection in the sinuses. The cause of the actual sinuses getting blocked to begin with can be due to cold, allergies, nasal polyps, or perhaps a shift in the nose called a deviated septum.