The presence of foam in the urine does not necessarily indicate diabetes. The diagnosis of diabetes is based on the blood glucose level and clinical symptoms. There are also some diabetic patients who do not have obvious symptoms but only have significantly elevated blood glucose found during physical examination. The diagnostic criteria for diabetes are fasting venous blood glucose >7mmol/L and venous blood glucose >11.1mmol/L 2 hours after meals. if there is foam in the urine it is mostly due to protein in the urine, there are many causes of urine protein, diabetes is only one of the causes of protein in the urine. In addition to high blood pressure, kidney disease, cold, infection and other factors can appear positive urine protein, so it is necessary to test urine routine, blood routine, biochemical series and other related tests to clarify the cause of the disease in order to target treatment.