A pilonidal sinus is a small tunnel that develops at the top of the crease in the buttocks. Trapped hair around the buttocks crease can lead to an abscess, and a pilonidal sinus may develop as a ...

The sinuses are four hollow spaces on both sides of your face and head. They're connected by narrow channels that allow air and fluids to flow between your nose and throat. If you have inflammation in ...

Share on Pinterest Inflammation from a sinus infection can put pressure on nerves, causing tooth pain. Sinuses are cavities that are filled with air. Small hairs called cilia line the sinuses. Cilia ...

Sinus tumors develop in your nasal cavity and in the open spaces around your nose, which are called the paranasal sinus cavities. They’re the same areas where you often feel pain and pressure when you ...