Urine sugar (++) refers to excessive glucose content in the urine, which is reflected in the urine routine examination. The clinical appearance of urine glucose (++) can be seen in the following two major types of diseases: 1. diabetes mellitus, diabetes mellitus patients with high blood glucose, beyond the kidney’s ability to absorb glucose, a large amount of glucose from the kidneys out of the body and produce urine glucose (++), blood glucose > 8.4mmol/L or more, urine glucose (++) may appear in the urine. 2. renal tubular disease, because the renal tubular reabsorption of glucose impaired. causing normal glucose to be excreted from the renal tubules. This condition is usually caused by a lowering of the renal glucose threshold and is usually a tubular-associated disease. Therefore, urine glucose (++) is primarily an increase in glucose in the urine and is seen for many reasons.