A sinus infection (sinusitis) is caused by a virus or (sometimes) bacteria that creates swelling in the nasal passages. Oftentimes, sinus infections come with or after a viral upper respiratory ...

Sinuses are air-filled structures in your head that serve many purposes. They create a mucus that moisturizes the inside of your nose. Additionally, sinuses affect the way your voice sounds and act as ...

Sinus infections can cause facial pain and pressure, headaches, congestion, and discolored mucus. People may find it difficult to determine if their symptoms are caused by a sinus infection or a cold.

Allergic rhinitis (allergies or hay fever) and sinusitis (sinus infections) can cause similar symptoms, making them difficult to tell apart. However, they have different causes and treatments.

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 ...