Simply put, sinusitis is inflammation of lining of your sinuses.
The sinuses are located behind eyes, cheeks, and jaw. They are chambers in which mucous is produced to clean out bacteria that we take in every day through mouth and nose. The mucous moves along cilia, which are tiny, moving hairs that maneuver mucous. Sinusitis creates difficulties for sinuses as they try to do their job, because cilia cease to move and sinuses either produce too much mucous or too little.
Sinusitis can be caused in a variety of ways. The inflammation of sinus lining is sensitive to changes in temperature or humidity, and often swimming, diving, extreme changes in temperature, and smoking will set off inflammation. The reason these things can cause sinusitis is that they create a friendly environment for bacteria and viruses.
For example, smoking paralyzes cilia, causing sinuses to think that there are bacteria or a virus and to produce more mucous. Since cilia cannot move, mucous just sits there, congests, and becomes a breeding ground for more bacteria, creating a sinus infection. Stagnant water or liquid buildup from water activities can produce similar effects. Or, if a virus has already infected sinuses and swelling occurs, then produced mucous will build up even more. Sinusitis is just beginning of any nasal problem.
What many people donít know is that sinusitis, though beginning in sinuses can also contribute to an ear infection. The reason is that sinuses and ears are connected through Eustachian tube, and something as simple as sneezing can push infection right out to ears. Not only can infection move out to ears but also down to lungs. Sinusitis is not entirely unrelated to an upper respiratory infection. Often Sinusitis, ear infection, and upper respiratory infection have similar, if not same, causes.