Which condition is characterized by excessive tearing?

The condition characterized by excessive tearing is lacrimal duct obstruction. In this situation, the normal drainage of tears through the lacrimal sac and duct is impaired. When the lacrimal ducts are obstructed, tears accumulate in the eyes instead of being properly drained away, leading to an overflow of tears, often perceived as excessive tearing.

Dry eye syndrome, on the other hand, typically results in decreased tear production, which can lead to discomfort but not excessive tearing. Pinguecula and pterygium are growths on the conjunctiva that may cause irritation and redness but are not primarily associated with excessive tear production. Therefore, the characteristic of excessive tearing specifically points to lacrimal duct obstruction.