High urine vitamin C is a normal physiological phenomenon. For example, eating large amounts of fresh vegetables and fruits rich in vitamin C before a recent checkup can cause vitamin C to be elevated. The part of vitamin C in the body that is not absorbed and the excess is excreted through the urine, so the urine vitamin C will be high. Also, if you are taking vitamin C tablets for various reasons, it can also lead to elevated vitamin C in the body. Excess vitamin C is excreted in the urine, and this can lead to elevated vitamin C in the urine. When elevated vitamin C occurs, it will quickly return to normal if you eat as little fresh vegetables and fruits as possible and try to control your intake of vitamin C. If it is a disease state, commonly after severe vomiting, for example, some people have pregnancy vomiting or diabetic ketoacidosis, there will be elevated urine vitamin C. At this time, we need to see if the blood glucose level is normal.