Dacryocystitis is an infection of the tear sac
that lies between the inner corner of the eyelids and the nose. It usually results from
blockage of the duct that carries tears from the tear sac to the nose. The blocked duct
harbors bacteria and becomes infected. Dacryocystitis may be acute (sudden onset) or
chronic (frequently recurs). It may be related to a malformation of the tear duct, injury,
eye infection, or trauma.