What Causes Sinus Infections?

The sinuses are air pockets located inside the bones of the skull. They are located to either side of the nose (maxillary), behind and in between the eyes (ethmoid), in the forehead (frontal), and there is one much further back in the head (sphenoid). These spaces contain mucus that drains by way of small pin holes in the sinuses. As a result of allergies or colds, these small holes get plugged, preventing the mucus from draining properly. As the mucus builds up, pressure builds and causes pain. In addition, the mucus becomes a perfect breeding ground for bacteria to grow, resulting in sinusitis. Acute sinusitis can last four weeks or more while chronic sinusitis can last twelve weeks or more.