Sinusitis is an inflammation, or swelling, of the tissue lining the sinuses. The sinuses are four paired cavities (spaces) in the head. They are connected by narrow channels. The sinuses make thin mucus that drains out of the channels of the nose.
Sinus headaches are headaches that may feel like an infection in the sinuses (sinusitis). You may feel pressure around the eyes, cheeks and forehead. Perhaps your head throbs.
What are the symptoms of sinusitis?
Pain, pressure and fullness in the cheeks, brow or forehead
Worsening pain if you bend forward or lie down
Achy feeling in the upper teeth