Elevated blood sugar concentration can cause swelling in the eyes of individuals. Under normal circumstances, blood sugar in the human body can maintain the normal energy metabolism of the human body within a certain range, but if blood sugar is too high, it will lead to lesions of various blood vessels in the body, especially the tiny blood vessels. Most of the blood vessels inside the human eye are small vessels, so high blood sugar can easily cause eye diseases, which can lead to blurred vision or swelling of the eyes, and in serious cases, it can affect the normal vision of individuals and even lead to blindness. Various sugar factors gather in the blood vessels, plus the tiny blood vessel diameter is too small, once triggered thrombosis, it is easy to block the eye blood vessels. So people with high blood sugar should pay attention to keep their blood sugar at normal levels and try to avoid blood sugar fluctuations in order to keep themselves healthy.