Sinusitis is an infection of the sinus cavities.
Acute sinusitis is an infection of the sinus cavities around your nasal passages. This interferes with drainage and causes mucus to build up. Symptoms often include yellow or greenish discharge; nasal obstruction or congestion; pain and tenderness around your eyes, cheeks or forehead; a reduced sense of smell; and a cough which may be worse at night. Acute sinusitis is often caused by the common cold. Sinusitis that lasts more than eight weeks or keeps coming back is called chronic sinusitis.
Treatment of sinusitis depends on the signs and symptoms.