Sinus headache refers to head and facial pain associated with inflammation of the sinuses (called sinusitis). The sinuses are hollow cavities in the skull that have openings into the nose. Colds and allergies cause inflammation of the nasal passages and can lead to sinusitis. Sinus headache is a symptom of sinusitis.

Sinus Headache: Areas of Pain
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Allergies and viral upper respiratory infections increase nasal secretions and cause tissue lining the nasal passages to swell. This results in nasal congestion and stuffiness. The nasal passages become blocked and normal drainage cannot occur. Secretions that are trapped in the sinuses may become infected with bacteria or, rarely, fungus. The swollen tissue or infection may create pain and pressure.