How Does Diabetes Lead to Kidney Failure? Understanding Diabetic Nephropathy
Diabetes harms your kidneys in the long term. The kidneys contain millions of small structures called nephrons, which filter waste materials and excess fluid out of the circulation. Over time, excessive blood sugar can damage these structures.
This can happen in both type 1 and type 2 diabetes and, if not treated properly, can lead to chronic renal disease and kidney failure.
Diabetes can damage your kidneys over time, so knowing the warning symptoms and how to safeguard your kidney function can help you identify problems early and delay progression.
What Is Diabetic Nephropathy?
Diabetic nephropathy is kidney disease due to diabetes. It is also known as diabetic kidney disease. The illness might develop gradually and symptoms may not be present initially. But as the damage worsens, the kidneys become less efficient at removing waste products from the blood.
Type 1 vs. Type 2 Diabetes and Kidney Risk
Both types of diabetes can affect the kidneys. In type 1 diabetes, kidney disease often develops after several years. In type 2 diabetes, damage may already be present when diabetes is diagnosed because the condition can remain unnoticed for years.
Stages of Diabetic Kidney Disease
CKD stages are based mainly on eGFR, while the level of albumin in the urine provides additional information about the extent of kidney damage and risk.
Stage 1-2: Early Kidney Damage
Stages 1 and 2 have a normal or slightly reduced eGFR but show signs of kidney damage (albumin in the urine). Testing at these stages is important, as the individual may have no visible symptoms.
Stage 3-4: Declining Kidney Function
Stage 3 is a moderate loss of eGFR and stage 4 is a significant loss. Possible symptoms are tiredness, oedema, changes in urine, feeling unwell or reduced appetite.
Stage 5: Kidney Failure
Stage 5 is renal failure, often with an eGFR <15 mL/min/1.73 m². At this point, the kidneys may not be able to work well enough to remove waste and fluid. Depending on symptoms, test results and overall health, dialysis or transplantation may be needed.
Early Warning Signs and Symptoms to Watch For
Early kidney disease often has no clear symptoms. In later stages, possible diabetic kidney disease symptoms include:
- Swelling around ankles, feet, hands or face
- Foamy-looking pee
- Changes in urination frequency
- Weakness or fatigue
- Nausea or loss of appetite
- Advanced disease with muscle cramping or pruritus
There are several explanations for these symptoms and they don’t necessarily mean you have diabetic kidney damage. Thus, urine and blood tests are the more reliable way to diagnose kidney disease in the early stages.
Risk Factors That Speed Up Kidney Damage
Many variables can raise the risk of diabetes and kidney failure or worsen existing kidney disease.
Uncontrolled Blood Sugar
Kidney blood arteries and nephrons are damaged by chronically high blood glucose. Following an individualised Diabetes Management Plan and testing HbA1c as recommended can help keep glucose levels within the target range.
High Blood Pressure
High blood pressure can raise the pressure on the kidney’s filtering mechanism and worsen the damage. Regular check-ups, proper medicine and a low salt diet help relieve this tension.
Smoking and Obesity
Smoking damages blood arteries and has been linked to aggravating renal disease. There are correlations to diabetes and high blood pressure and being overweight or obese can be a concern. That said, weight management, physical activity and quitting smoking can be beneficial for renal health.
How Diabetes-Related Kidney Disease Is Diagnosed
To diagnose diabetes-related kidney disease, doctors advise urine and blood tests and look at your medical history and blood pressure. Two more crucial tests are the urine albumin-to-creatinine ratio (UACR) and estimated glomerular filtration rate (eGFR).
Urine Albumin Test
A urine albumin-to-creatinine ratio or UACR, looks for albumin leaking into urine. A UACR greater than 30 mg/g is higher than normal. Albumin levels might change, so repeat testing may be necessary for abnormal results.
eGFR and Blood Tests
Creatinine is a waste product of normal muscle action. A blood test analyses the amount of creatinine present and then uses this to estimate the glomerular filtration rate (eGFR). Lower eGFR usually indicates lower kidney function and can be used to monitor risks with diabetes and kidney failure.
Treatment and Management Options
The purpose of the treatment is to safeguard the function of the kidneys, keep diabetes under control and limit the risk of cardiovascular problems. Treatment is guided by renal function, albuminuria, blood pressure and other health concerns.
Blood Sugar and Blood Pressure Control
Keeping blood glucose and blood pressure within individualised targets can slow down kidney damage. A healthcare provider may also recommend a diet that is healthy for the kidneys, physical activity and quitting smoking.
Medications (ACE Inhibitors/ARBs)
Medication choices depend on a person’s renal function, blood pressure, albuminuria and other health issues.
| Medication | How it helps | When it may be used |
|---|---|---|
| ACE inhibitors | Lower blood pressure and reduce albumin leakage into the urine, helping protect kidney function. | Often used in people with diabetes, hypertension and albuminuria. |
| ARBs | Lower blood pressure and reduce albuminuria, which can help slow kidney damage. | May be used when an ACE inhibitor is not suitable or is not tolerated. |
| SGLT2 inhibitors | Help protect kidney function and can slow the progression of CKD in many people with type 2 diabetes. | Used in appropriate people with type 2 diabetes and CKD, depending on kidney function and other health factors. |
Dialysis or Transplant in Advanced Stages
If kidney failure due to diabetes has reached a severe stage, dialysis or transplantation may be required. Haemodialysis employs a machine to remove waste products and extra fluid from the blood, whereas peritoneal dialysis uses the lining of the abdomen to conduct the filtering.
Conclusion
Diabetic nephropathy usually develops gradually, making regular screening important. Controlled blood glucose and blood pressure, as well as appropriate medicines and healthy lifestyle measures, can help slow kidney damage. People with diabetes should discuss regular UACR and eGFR testing with their healthcare team, even when they don’t experience any noticeable symptoms.
For people who require dialysis because of diabetes and kidney failure, NephroPlus provides in-clinic dialysis, home haemodialysis, dialysis on wheels, dialysis on call and holiday dialysis. The right option depends on your medical needs and the plan agreed with your nephrology team.
Frequently Asked Questions (FAQ's)
Can diabetes-related kidney damage be reversed?
Early kidney damage may sometimes improve, particularly when albuminuria falls after treatment. However, established loss of kidney function is not always reversible.
How long does it take for diabetes to cause kidney failure?
There is no fixed timeline. Some people develop kidney disease after many years, while others progress faster because of persistent high blood glucose, high blood pressure, smoking or existing CKD.
What are the first signs of diabetic kidney disease?
One of the earliest measurable changes is increased albumin in urine. A rise in UACR can occur before substantial loss of eGFR, which is why screening matters even without diabetic kidney disease symptoms.
Is dialysis always needed for diabetic nephropathy?
No. Many people with diabetic kidney disease symptoms do not progress to renal failure. Dialysis is required when there is significant impairment of kidney function. The choice relies on symptoms, blood tests and overall health.
