28/04/2024
The tear that is produced in lacrimal glands drains to tiny ducts through the holes (punctum) located at the nasal side of upper and lower eyelids and finally to the lacrimal sac. The tear duct (nasolacrimal canal) communicates the lacrimal sac to the nasal cavity. Excess drainage of the tear into the nasal cavity is the underlying cause of runny nose in crying people.