Many people in life will have this experience, after waking up eyes swollen, and unknowingly swelling subsided, it is not clear when it will appear again. The specific reasons are as follows: 1. Dietary factors: drinking too much water and eating too much salty food before going to bed. Water and sodium retention, the kidneys are overburdened due to lead to eyelids and other weak parts of edema. As well as malnutrition low protein can also manifest as swollen eyes. 2, eye factors: excessive eye use, long time playing cell phones to see the electronic screen, will make the eyes overworked, poor blood circulation, edema. Lack of sleep so that the eyes do not get rest and crying tear stimulation will affect the blood circulation of the eyes leading to edema. 3, postural factors: leading to obstruction of fluid reflux, such as not pillow pillow, head low foot high position, etc. 4. Allergic factors: Allergy to certain substances leads to edema of the eyelids. 5, physiological factors: many women will have physiological edema due to hormone secretion during PMS. 6, kidney factors: kidney dysfunction and organic lesions of the kidneys can lead to water-electrolyte disorders and physiological dysfunctions resulting in oedema. 7. Heart factor: Cardiac insufficiency can also lead to edema of the eyes. However, edema is also generally found in the legs and ankles. In summary, diet, lack of sleep, body position, physiological conditions, allergies and kidneys, heart and many other factors can cause edema of the eyes after waking up, if this situation often occurs, it is recommended to seek medical attention to identify the cause of symptomatic treatment.