SYNTHETIC DEMONSTRATION — no real student or patient. Not a medical device.

endocrine

Diabetes and Kidney Disease: How Diabetes Damages the Kidneys

Diabetes is one of the leading causes of kidney disease. Persistently high blood sugar damages the kidneys' filtering units over time — a condition called diabetic nephropathy. Early stages have no symptoms, making regular urine and blood tests essential for anyone with diabetes to catch damage early.

Talk to a clinician

Nina Osei, NP — Nurse Practitioner

checkups, refills & skin. Gale can match you with a licensed clinician for a visit.

Find care →

How does diabetes damage the kidneys?

The kidneys filter waste from the blood through millions of tiny units called glomeruli, each supplied by its own small blood vessel network. High blood sugar injures these vessels in the same way it damages those in the eyes and peripheral nerves — causing them to thicken, leak protein, and gradually lose their filtering function. Diabetes is the leading cause of chronic kidney disease in the United States, affecting approximately one in three adults with diabetes 1.

Over years, this can progress from subtle protein leaking into the urine all the way to significantly reduced kidney function. When kidney function falls far enough, the kidneys can no longer maintain the body's balance of fluids, salts, and waste — a stage called kidney failure (end-stage renal disease) requiring dialysis or transplant 12. High blood pressure, which is very common in people with diabetes, accelerates kidney damage significantly 2.

What are the stages and symptoms of diabetic kidney disease?

Diabetic kidney disease progresses silently for many years 12. The earliest detectable sign is small amounts of a protein called albumin appearing in the urine — a stage called moderately increased albuminuria. This signals that the kidney filter is starting to leak.

As kidney function declines, blood tests show a rising creatinine level and falling estimated glomerular filtration rate (eGFR), a measure of how well the kidneys are filtering.

Only in later stages do symptoms typically appear, and they are often nonspecific: - Swelling in the feet, ankles, or hands (fluid retention) - Fatigue and difficulty concentrating - Reduced appetite or nausea - Foamy or bubbly urine (significant protein leakage) - High blood pressure that becomes harder to control

Because symptoms arrive late, routine laboratory testing is the only reliable way to detect damage early 1.

Which tests monitor kidney function in people with diabetes?

The ADA Standards of Care recommend that most people with diabetes have two specific tests checked at least annually 1:

Urine albumin-to-creatinine ratio (UACR) — detects albumin (protein) leaking from the kidneys. A normal result is below 30 mg/g. Moderately elevated levels (30–300 mg/g) indicate early kidney disease; higher levels suggest more advanced damage.

Estimated glomerular filtration rate (eGFR) — calculated from a blood creatinine measurement, this estimates how many milliliters of blood the kidneys filter per minute. An eGFR above 60 is generally considered normal; lower values indicate reduced kidney function.

Together, UACR and eGFR give a complete picture of both structural damage and functional decline. Your clinician may check both more frequently if abnormalities are already present 1.

What slows the progression of diabetic kidney disease?

Several interventions have strong evidence for preserving kidney function 123:

Blood sugar control — keeping A1c near your individualized target reduces the rate of kidney damage accumulation. Even modest improvements matter over years 1.

Blood pressure control — high blood pressure damages kidney vessels directly; targets in diabetes are typically lower than in the general population 1.

ACE inhibitors or angiotensin receptor blockers (ARBs) — these blood pressure medicines have specific kidney-protective effects beyond blood pressure lowering, particularly in people with elevated urine albumin 1.

SGLT2 inhibitors — a class of diabetes medications (such as dapagliflozin and empagliflozin) with strong evidence for slowing CKD progression and reducing the risk of kidney failure, independent of glucose-lowering effects 3. The DAPA-CKD trial showed dapagliflozin reduced the composite of ≥50% eGFR decline, kidney failure, or death from kidney or cardiovascular causes by 39% compared to placebo 3.

Reducing sodium and managing protein intake — a registered dietitian can provide personalized guidance. Avoiding NSAIDs (ibuprofen, naproxen) is also important — these common pain relievers can accelerate kidney damage in people with existing kidney disease 2.

When might I need to see a nephrologist?

Your primary care clinician can manage early diabetic kidney disease. Referral to a nephrologist (kidney specialist) is typically considered when 1:

  • eGFR falls below approximately 30 or is declining rapidly
  • Urine albumin is very high and difficult to control
  • Blood pressure is difficult to manage despite multiple medications
  • The diagnosis of kidney disease is uncertain (not clearly diabetes-related)
  • Kidney failure requiring dialysis is approaching

Gale can help coordinate that referral and ensure your lab history is shared with the nephrologist.

Common questions

Can diabetic kidney disease be reversed?

Very early changes, particularly mildly elevated urine albumin, can sometimes normalize with excellent blood sugar and blood pressure control. More established kidney disease is generally not reversible, but progression can be significantly slowed with the right medications and lifestyle changes.

Does having diabetes mean I will definitely develop kidney disease?

Not necessarily. Many people with well-controlled diabetes maintain normal kidney function throughout their lives. The risk increases with poor blood sugar control, high blood pressure, longer diabetes duration, and family history of kidney disease — but the risk is not inevitable.

My urine test showed a little protein. Should I be alarmed?

A single elevated result does not always mean kidney disease. Protein in urine can be caused by a recent infection, fever, intense exercise, or dehydration. Clinicians typically confirm the finding with repeat testing over several months before making a diagnosis.

Can I eat a lot of protein if I have diabetic kidney disease?

High protein intake may increase the workload on the kidneys. Guidance depends on your stage of kidney disease. A registered dietitian with experience in kidney disease can provide personalized dietary recommendations — ask your Gale clinician for a referral.

Talk to a clinician

Nina Osei, NP — Nurse Practitioner

checkups, refills & skin. Gale can match you with a licensed clinician for a visit.

Find care →

Signs that need prompt medical attention

  • —Sudden large decrease in urine output
  • —Severe swelling of the legs or sudden weight gain of several pounds in a day or two
  • —Shortness of breath at rest or when lying down
  • —Confusion or difficulty thinking clearly alongside worsening kidney function

These symptoms can indicate rapidly worsening kidney function or fluid overload. Contact your clinician the same day or go to an emergency room if symptoms are severe.

This article provides general health education and does not replace personalized medical advice. Kidney disease management requires individual assessment by a qualified clinician who can review your specific lab results and medical history.

References

  1. 1.American Diabetes Association Professional Practice Committee (2024). Standards of Care in Diabetes—2024. Diabetes Care. doi:10.2337/dc24-SINT ✓Annual UACR and eGFR monitoring recommendations; blood pressure and glycemic targets for kidney protection; role of ACE inhibitors/ARBs and SGLT2 inhibitors in diabetic kidney disease; definition of albuminuria categories
  2. 2.National Institute of Diabetes and Digestive and Kidney Diseases (2023). Diabetic Kidney Disease. NIDDK Health Information. link ✓Overview of how diabetes causes kidney damage through blood vessel injury; prevalence (1 in 3 adults with diabetes); role of blood pressure, NSAID avoidance, and lifestyle in kidney protection
  3. 3.Heerspink HJL, Stefansson BV, Correa-Rotter R, et al. (DAPA-CKD Trial Committees and Investigators) (2020). Dapagliflozin in Patients with Chronic Kidney Disease. New England Journal of Medicine. doi:10.1056/NEJMoa2024816 ✓DAPA-CKD trial: dapagliflozin reduced the composite kidney/cardiovascular outcome by 39% in patients with CKD and albuminuria, with or without type 2 diabetes

3 sources, numbered by first appearance. General health information, not medical advice — synthetic demonstration content.