Well, yes, blocked tear duct can be hereditary. In common, there are some people, who are born with it. As we know that blocked tear duct, is a result of an improperly formed tear duct that obstructs the tear drainage system. Generally speaking, the tear duct drains tears from the eye to the inside of the nose. And you should know that if the duct cannot drain the tears, they have nowhere to go and may collect in the eye, leading to irritation. Some symptoms can include tears pooling in the eyes or draining down the eyelid and cheeks, discharge from the eye. Treatment for a blocked tear duct is usually simple and may include massaging the tear duct or antibiotics if an infection is present. Also, surgery may be essential in some degree.