Edema occurs when a woman has her period, mainly because when a woman has her period, her body’s estrogen level will rise, and estrogen will cause water and sodium retention, which will cause an increase in interstitial fluid, thus triggering women to have edema in their eyes. After menstruation clears, the edema will slowly disappear, but if women usually also have swollen eyes, it is considered to be related to kidney function. It is advisable to go to the hospital for urological ultrasound and urinary routine examination to clarify the cause and target treatment. Women should pay attention to menstrual hygiene during their periods, change sanitary napkins regularly, and pay attention to keeping warm and not getting cold.