Diabetic nephropathy is damage to small blood vessels caused by diabetes, and the kidneys contain a large number of small blood vessels. Therefore, it generally takes more than ten years for diabetes to damage these small blood vessels, causing kidney lesions, proteinuria, renal failure, and other clinical manifestations. This disease can be treated in departments specializing in diabetes or endocrinology, as well as in nephrology. In the early stages of diabetic nephropathy, treatment primarily involves controlling blood sugar levels, and visiting departments like diabetes or endocrinology might be more specialized in this regard. These departments are proficient in adjusting medications for blood sugar control. When patients develop significant proteinuria, the condition progresses, and it is advisable to visit nephrology. At this point, the treatment focuses on the kidney lesions, as well as managing complications caused by diabetic nephropathy.