Sinus infections are some of the most common diseases around the globe. This condition, also known as sinusitis, occurs when there is an inflammation of the sinuses. All in all, there are 8 sinuses (4 pairs) in the human body and they are all located in the head. It is important to know them and where they are located to be able to apply effective treatment. The sinus pairs are as follows: frontal, maxillary, ethmoid and sphenoid sinuses. Frontal sinuses run vertically in the forehead, maxillary sinuses are located behind the cheekbones, ethmoid sinuses are between the eyes and lastly sphenoid sinuses are located behind the eyes. Although most of the sinus infections symptoms occur in all cases of sinusitis, some symptoms of sinus infection only appear on inflammation of certain sinuses….