The unconscious flow of tears from the eyes, called tear overflow, is most often considered to be a disease of the lacrimal duct, and requires a visit to the hospital to check for narrowing, atresia, or covered obscuration of the lacrimal dots, or congenital absence. In addition, the tear duct, common tear duct, and nasolacrimal duct should be checked for obstruction or narrowing, including congenital atresia, inflammation, tumors, stones, trauma or foreign bodies, and other factors that cause structural or functional insufficiency of the tear duct, resulting in the inability to drain tears. The main reason for unconscious tearing in middle-aged and elderly people is tear overflow, the main reason is the relaxation of the oculocutaneous muscle, the role of the tear pump is weakened or disappeared, resulting in tear drainage obstruction, which belongs to the functional tear overflow.