Dacryocystitis is an inflammation of the lacrimal sac in the inner corner of the eye. Tears run down through this sac when they leave our eyes. Tears have a very important function in helping to keep the eyes hydrated, clean and free of bacteria. Their production by the lacrimal glands is an ongoing process. In case of blockage of the lacrimal canal, bacteria accumulate inside the lacrimal sac, an infection develops, which is followed by an inflammatory process, which can lead to dacryocystitis. Acquired dacryocystitis can be acute or chronic. Acute dacryocystitis is a sudden onset of pain and redness in the medial canthal region.