This document discusses the causes and treatment of watery eyes. It begins by defining watery eyes as excess tearing caused by overproduction of tears or obstruction of tear drainage. The two main types are lacrimation due to excessive tear production and epiphora due to issues with the tear drainage system. The tear production system and drainage system anatomy are described. Causes of excess tearing include inflammation, irritation, and hypersecretion. Causes of defective drainage include punctal malposition, obstructions, and lacrimal pump failure. Evaluation involves examining the eyes and testing tear drainage function. Treatment depends on the underlying cause but may include punctal dilation, lacrimal intubation, dacryocystorhinostomy surgery