Diabetic nephropathy generally does not cause symptoms of back pain. Diabetic nephropathy refers to patients with long-term hyperglycemia, typically those whose blood sugar has been elevated for ten years or more, causing damage to the small blood vessels. The kidneys, being rich in small blood vessels, undergo glomerular sclerosis. Early in the disease, patients experience an increased glomerular filtration rate. As the condition progresses, proteinuria gradually increases. When proteinuria occurs, patients may exhibit noticeable edema, and in some cases, patients may develop severe edema due to substantial proteinuria, leading to serious complications like pulmonary edema and heart failure, which manifest as respiratory difficulties and chest tightness. However, these conditions do not cause back pain, even though there is glomerular sclerosis, as patients do not feel any pain associated with it.