Many patients with a long history of diabetes often find that there is a lot of foam in the urine. In this case, it is best to check with the hospital and be alert to the occurrence of diabetic nephropathy! For the appearance of more foam in urine, attention should be paid to identify the following three conditions: 1. If fresh urine contains a lot of foam then you should be alert to the combination of urinary tract gas-producing bacillus infection. 2, If the foam appears after a period of time, it may be due to the decomposition of sugar in the urine by external bacteria to produce gas. 3, the last, and most common, is the emergence of chronic complications of diabetes, that is, diabetic nephropathy, which can lead to increased protein content in the urine, easy to produce foam. What is diabetic nephropathy It is generally believed that diabetic nephropathy is one of the most common microvascular complications of diabetes mellitus, with microalbuminuria to massive proteinuria as the main manifestation. Diabetic nephropathy is found in about half of people with diabetes for 10-20 years, and poor glycemic control can accelerate the onset and progression of diabetic nephropathy. Currently, diabetic nephropathy is the leading cause of death in type 1 diabetic patients with a disease duration of 10 years or more, and it is also the second leading cause of kidney failure leading to dialysis, therefore, diabetic patients should be alert to the occurrence of diabetic nephropathy.