A sinus infection, or sinusitis, is inflammation of the cavities around your nasal passages ... or behind your eyes. This ...

Sinuses are air-filled cavities that are located within the bones of the skull, especially around the nose and eyes. These cavities are lined with a membrane that produces mucus, helping to ...

Sinusitis can cause facial pressure, sinus headache, and other symptoms. Treatment may depend on the cause. A sinus infection, also known as sinusitis or rhinosinusitis, occurs when your nasal ...