When crying, the lacrimal glands of the eyes secrete large amounts of tears, which are composed mainly of water. In the process of producing tears, there is a large amount of local fluid in the eye, which cannot be completely discharged through the tear duct or other parts of the eye in a short period of time. Therefore, in the process of producing large amounts of tears, the osmotic pressure around the local tissues of the eyelids changes, and some of the water seeps into the interstices of the eyelid tissues, causing the edema of the eyelids that develops after crying. It is this phenomenon that determines the edema of the eyelids after crying because of the large amount of fluid produced that cannot be metabolized quickly. Since it is not accompanied by significant dysfunction, the edema will resolve on its own within a short period of time after stopping crying and does not require special treatment.