Your sinuses are hollow air spaces within the bones between your eyes, behind your cheekbone, and in the forehead. They produce mucus, which helps keep the inside of your nose moist. That, in turn, helps protect against dust, allergens, and pollutants.
Interesting Sinus Facts
No one is completely sure why we have sinuses, but some researchers think they keep the head from being too heavy.
Sinuses are also are responsible for the depth and tone of your voice. This explains why you sound like Clint Eastwood when your sinuses are all stuffed up.
If the tissue in your nose is swollen from allergies, a cold, or environmental triggers, it can block the sinus passages. Your sinuses can’t drain, and you may feel pain.
There are eight sinus cavities in total. They are paired, with one of each in the left and right side of the face.
- Two sinus cavities are located in the forehead.
- Two are behind each cheekbone.
- Two sinus cavities are within the bones between your eyes.
- Two are behind each eye.
Common Sinus Problems
Each sinus has a narrow spot, called the transition space (ostium), which is an opening that’s responsible for drainage. If a bottleneck or blockage occurs in the transition of any of the sinuses, mucus backs up.
An Extra Sinus
About 10% of people have an extra sinus. The extra sinus “effectively narrows that transition space,” says Ford Albritton, MD, director of the Center for Sinus and Respiratory Disease at the Texas Institute in Dallas.
Deviated Nasal Septum
Another common issue is a deviated nasal septum, the thin wall of bone and cartilage inside your nasal cavity that separates your two nasal passages. Ideally, your septum is situated in the center of your nose, equally separating the two sides. But whether from genetics or injury, in about 80% of people, the nasal septum is displaced to one side, making one nasal passage smaller than the other. A deviated septum is one reason some people have sinus issues. A deviated septum can also lead to obstructed breathing and snoring.