Glucose 3+ generally refers to positive glucose in urine, which may be related to physiologic causes such as large intake of high-sugar foods, or pathologic causes such as diabetes mellitus and kidney disease. 1. Physiological reasons: when consuming a large amount of high-sugar food, etc., it may cause temporary elevation of urinary glucose. 2. Pathological causes: urine does not contain glucose, if there is a urine glucose 3 +, it may be due to high blood sugar caused by renal glucose threshold decreased significantly, the renal tubules can not be excess glucose absorption, so as to be excreted in the urine, indicating that the patient may have diabetes mellitus disease. Kidney disease can cause changes in the renal glucose threshold, which can also cause elevated glucose in the urine. When glucose in the urine is elevated, another examination should be performed every other day to clarify the cause under the guidance of the doctor so that active treatment can be carried out.