Swollen eyes in the morning usually do not require special methods to reduce the swelling. After getting up in the morning, the swollen eyes will slowly improve as people move around. The cause of swollen eyes in the morning is mainly nephritic edema, in addition to drinking a lot of water the night before can also lead to swollen eyes in the morning. The mechanism of nephritic edema is mainly twofold. Patients with nephritis tend to have a mild reduction in glomerular filtration rate, which leads to water accumulation in the body, and less water usually flows to the lower extremities of the body during the day, because the water is less, so it is often not visible that the patient has edema. However, after a person lies in bed overnight, the water overcomes the effect of gravity and can be distributed to the lax tissues of the body, and the most conspicuous lax tissues are the face and eyelids, so in the morning, we can find edema of the face and eyelids. Because this edema is usually mild, it does not require special treatment and will slowly subside when the person is active. However, it is important to find the cause of the swollen eyes in the morning and then give the appropriate treatment to eliminate the root of the problem.