Morning-After Puffy Eyes
Seasonal allergies, a cold, a sinus infection: These are some of the things that can lead to water building up under the eye.
"We have the thinnest skin around our eyes, so it's the area that's most influenced by the in-and-out flow of fluids," Goldburt says.
A dinner heavy with salty food or a night of crying while watching a tearjerker movie can also cause morning-after puffiness. The reason is osmosis. "Water always travels from areas in the body where there's low salt concentration to tissues where there's more salt, Goldburt explains. That principle holds true whether the salt comes from tears or from soy sauce.