A sinus headache is caused by inflammation or blockage in the sinus cavities, often due to sinus infections (viral, bacterial, or fungal), allergies, or structural issues in the nose like nasal polyps or a deviated septum. These blockages cause mucus buildup and pressure in the sinuses, leading to pain and headache typically felt around the eyes, nose, cheeks, or forehead. Allergies, irritants like smoke, and sometimes dental problems can also trigger sinus headaches by causing inflammation or blockage in the sinuses.
Key causes of sinus headaches include:
- Sinus infections causing inflamed and mucus-filled sinuses
- Allergic reactions causing sinus inflammation
- Structural abnormalities blocking sinus drainage (nasal polyps, deviated septum)
- Environmental irritants and sudden air pressure changes
The blockage prevents mucus drainage, creating pressure and inflammation that results in headache pain associated with sinusitis.
