Tear duct blockage can be caused by a partial or complete obstruction in the ear drainage system, says the Mayo Clinic. The drainage system starts at the inner corner of the eye and works to remove tears from the surface of the eye into the nose. When the tear fluid arrives in the nose, it will either be absorbed, or it will evaporate. A blocked tear duct prevents the normal drainage of tears. Newborn babies are often born with this issue, but it resolves on its own over time. Adults can develop a blocked tear duct from infection, inflammation, injury or a tumor, the Mayo Clinic says. This can cause some mild to moderate symptoms.
Inflammation
Redness of the eye and surrounding tissues, including the eyelid, may be a sign of a blocked tear duct. The eye becomes irritated when the tears cannot move as they should through the drainage system. There may be painful swelling at the inner corner of the eye(s). Eye inflammation is called conjuctivitis.
Infection
Dacrocystitis describes recurrent eye infections. Mucous discharge of the eye or bloody tears are symptoms of such an infection. The Mayo Clinic explains that when tears are not draining properly, the fluids can promote bacterial, viral or fungal growth, leading to the infection of the eye.
Other Problems
Blurred vision is a common symptom of a tear duct blockage or eye infection. Continual tears that run onto the cheeks for no other known reason are associated with this ailment. Infants and children may wake up with a crusted-over eye that requires massage and a warm cloth to loosen before they can open their eyes. The crust may be yellowish and uncomfortable.
