Blocked Tear Duct (Dacryostenosis) | Symptoms & Causes

What causes a blocked tear duct?

  • Tears help clean and lubricate the eye and are produced in the lacrimal gland, located under the bone of the eyebrow.
  • Tears from the lacrimal gland flow over the eye through tiny ducts along the eyelid and drain away from the eye through two small openings at the inner corner of the eyelids.
  • They then drain into a larger passage from the eye to the inside of the nose, called the nasolacrimal duct, or tear duct.

In some babies, the openings into the tear duct haven’t formed properly. This causes a blockage, and the tears have no place to drain. A blocked tear duct can occur in one or both eyes.

What are the symptoms of a blocked tear duct?

Each child may experience symptoms differently, but the most common symptoms of a blocked tear duct include:

  • tears pooling in the corner of your baby's eye
  • tears draining down your baby's eyelid and cheek
  • mucus or yellowish discharge in the eye
  • reddening of the skin from rubbing

Because infants don’t produce tears until they are several weeks old, a blocked tear duct may not be noticeable at birth. A blocked tear duct may also be noticeable only when a baby cries, or in cold or windy weather when tears are stimulated.