Early Signs of Kidney Disease You Should Know  

Introduction

Kidney disease often develops quietly, with little or no warning in its early stages. That is why many individuals do not realise there is a problem until the condition has progressed to an advanced stage¹. 

However, recognising the early signs of kidney disease and seeking timely medical care can help slow or even avoid further kidney damage.  

In this blog, we will explore the early kidney disease symptoms, types and causes, lifestyle and prevention tips, and when it is important to consult a doctor. 

What Is Kidney Disease?

Healthy kidneys filter waste products, excess fluid, and toxins from the blood. They also help regulate blood pressure, maintain the body’s fluid and mineral balance, and produce hormones that support bone health and red blood cell production². Kidney disease occurs when the structure or function of the kidney is impaired. This can cause waste and fluid to build up in the body^3,4.

Types of Kidney Disease

Depending on the rate at which the symptoms have developed, kidney disease can be of two main types⁴:

• Acute Kidney Injury (AKI): AKI refers to the sudden drop in kidney function, which can develop over few hours to days and may be reversible, particularly when the underlying cause is identified and treated promptly. 
• Chronic Kidney Disease (CKD): CKD develops gradually over months or years and is usually not reversible. It can range from mild kidney damage to complete kidney failure. In extreme cases, kidney replacement therapies like dialysis and transplant may be needed to survive. 

Signs and Symptoms of Kidney Disease

The seriousness of your kidney disease is primarily determined by your eGFR (estimated glomerular filtration rate), which measures how effectively your kidneys filter waste from your blood, and your uACR (urine albumin-to-creatinine ratio), which assesses kidney damage and protein leakage. 

Symptoms of AKI 

AKI develops suddenly over hours or days. A sudden drop in kidney function, suggesting AKI, would typically be associated with one or more of the following kidney disease symptoms⁶: 

• Passing much less urine than usual 
• Nausea and vomiting 
• Swelling of the feet or legs 
• Extreme tiredness, dizziness, confusion, or drowsiness 
• Shortness of breath, particularly when lying down 

Important: AKI is a medical emergency and requires prompt evaluation and treatment. Early intervention can often restore kidney function and help avoid long-term damage^4,6.

Symptoms of CKD 

Some early signs and symptoms of CKD include: 

• Loss of appetite, nausea, or vomiting: Waste accumulation in the body can reduce appetite and cause digestive symptoms. 
• Changes in urination: You may urinate more or less often than usual, especially at night, or notice changes in the appearance of your urine (such as foamy urine). Persistent unusually foamy urine may indicate excess protein in the urine and should be evaluated^3,7. 
• Swelling (oedema): Puffy feet, ankles, legs, hands, or around the eyes can occur when the kidneys are unable to remove excess fluid effectively. 
• Persistent tiredness or weakness: Damaged kidneys can lead to a build-up of waste products in the blood, making you feel unusually tired or lacking in energy. 
• Shortness of breath: Extra fluid in the body or anaemia caused by kidney disease may make breathing difficult, especially during physical activity or while lying down. 
• Difficulty concentrating or feeling confused: The build-up of toxins in the blood may affect brain function, causing poor concentration or mental fog. 
• Muscle cramps: An imbalance of minerals and electrolytes due to reduced kidney function may lead to muscle cramps. 
• Sleeping difficulty: A buildup of waste in the blood due to reduced kidney function can make it difficult to sleep. Individuals with CKD are also more likely to experience sleep disorders (like sleep apnoea). 
• Itchy or dry skin: Persistent itching and dryness can develop as waste products accumulate in the body^4,8. 
• Blood in the urine: Blood in the urine may have several causes (including kidney or urinary tract conditions) and should be medically evaluated⁹. 

Note: Many individuals with early CKD have no symptoms at all. Kidney disease is often detected during routine blood or urine tests performed for conditions such as diabetes or high blood pressure¹⁰.  

Causes of Kidney Disease

The causes of kidney disease depend on whether it develops suddenly (AKI) or gradually (CKD). 

Causes of AKI 

AKI occurs when the kidneys suddenly stop working properly, often due to an illness, injury, or reduced blood flow to the kidneys. Common causes include⁶: 

• Severe dehydration or low blood pressure 
• Serious infections, such as sepsis 
• Heavy blood loss 
• Kidney stones or urinary tract blockage 
• Enlarged prostate 
• Some medications, such as non-steroidal anti-inflammatory drugs (NSAIDs; e.g., ibuprofen, naproxen), angiotensin-converting enzyme (ACE) inhibitors, and diuretics (water pills), may increase the risk of AKI in some individuals, especially during dehydration or severe illness. It is important to not stop taking your prescribed medications without consulting your doctor. 

Note: The iodinated contrast dye used in some imaging tests, such as CT scans and angiography, may increase the risk of AKI in individuals with existing kidney disease or other risk factors. However, for most individuals with healthy kidneys, the risk is low^6,11. 

Causes of CKD 

CKD develops gradually and is usually caused by long-term conditions that damage the kidneys over time. Common causes include¹²:

• Diabetes 
• High blood pressure (hypertension) 
• Repeated kidney infections 
• Glomerulonephritis (inflammation of the kidney filters) 
• Polycystic kidney disease (an inherited condition) 
• Long-term urinary tract blockage, such as recurrent kidney stones or an enlarged prostate 
• Long-term use of certain medications (including lithium and NSAIDs) 

Why Is Early Detection of Kidney Disease Important?

Recognising signs of kidney disease early can make a substantial difference in protecting your kidney health and overall well-being. Early detection is important for several reasons^1,13:

• Slows disease progression: Early detection (and management) can help preserve kidney function and possibly avoid the risk of kidney failure. 
• Avoids complications: Timely management reduces the risk of other health problems such as high blood pressure, anaemia, bone disease, and heart disease. 
• Reduces the need for dialysis or a transplant: Managing kidney disease in its early stages may help delay or avoid kidney replacement therapy. 
• Protects overall health: Healthy kidneys support many essential body functions, so early care benefits your overall health and quality of life. 
• Improves treatment outcomes: Lifestyle changes and medications are most effective when kidney disease is detected early. 

How Is Kidney Disease Diagnosed?

If your doctor suspects kidney disease, they may recommend one or more of the following tests to assess how well your kidneys are working and identify the underlying cause^6,14:

• Blood tests: Creatinine level in the blood is used to estimate your eGFR, which is an indicator of how well your kidneys are filtering waste. 
• Urine tests: A urine test measures UACR, which tells us if (and how much) proteins are present in the urine. Protein (especially albumin) in the urine is often one of the earliest signs of kidney damage. 
• Imaging tests: An ultrasound, CT scan, or MRI may be used to examine the kidneys for structural abnormalities, blockages, or other problems. 
• Kidney biopsy: In some cases, a small tissue sample of the kidney is taken and examined under a microscope to evaluate the cause and extent of kidney damage. 

Note: In cases of AKI, doctors may also monitor urine output closely and perform additional tests, such as an ECG or imaging studies, depending on the suspected cause. 

Lifestyle Tips to Manage Kidney Disease

Living with kidney disease involves more than taking medications. There are several lifestyle habits that you can follow to slow disease progression, improve your quality of life, and support your overall well-being: 

• Take all your medications as prescribed and never stop or change them without consulting your doctor. 
• Follow an individualised eating plan recommended by your doctor or renal dietitian. 
• Plan healthy meals in advance to make it easier to follow your dietary recommendations and avoid unhealthy food choices. 
• Stay physically active with walking, yoga, swimming, or other exercises approved by your doctor. 
• Get enough quality sleep by maintaining a regular sleep schedule and creating a comfortable sleep environment. 
• Manage stress by engaging in activities you enjoy, such as reading, listening to music, gardening, or practicing relaxation techniques. 
• Stay connected with family and friends to reduce stress and improve emotional well-being. 
• Join a support group or talk to others living with kidney disease to share experiences and receive emotional support¹⁵.
• Keep regular follow-up appointments so your doctor can monitor your kidney function and adjust your treatment when needed. 

Tips To Prevent Kidney Disease

While not all kidney diseases can be prevented, healthy lifestyle habits can significantly reduce your risk. Prevention is especially important if you have diabetes, high blood pressure, heart disease, or a family history of kidney disease. Some tips for preventing kidney disease include¹⁶: 

• Control diabetes and high blood pressure, as these are the leading causes of CKD. 
• Eat a balanced, kidney-friendly diet rich in fruits, vegetables, whole grains, and low-fat dairy products while limiting salt, added sugars, and processed foods. 
• Stay physically active for at least 30 minutes on most days to support overall kidney and heart health. 
• Maintain a healthy weight to lower your risk of diabetes, hypertension, and kidney disease. 
• Maintain adequate hydration according to thirst, climate, activity, and medical advice. Note: excessive water intake does not prevent CKD and can even be harmful in individuals advised fluid restriction. 
• Avoid smoking and limit alcohol intake. 
• Use over-the-counter painkillers (especially NSAIDs) only as directed, avoiding frequent or long-term use. 
• Address recurrent urinary tract infections (UTIs) promptly to prevent them from spreading to the kidneys. 
• Get regular kidney health check-ups if you have risk factors such as diabetes, high blood pressure, heart disease, or a family history of kidney disease.  

Note: excessive water intake does not prevent CKD and can even be harmful in individuals advised fluid restriction. 

When to Consult a Doctor?

Do not ignore persistent symptoms of kidney disease that could indicate a kidney problem. Early medical attention can help identify kidney disease before it becomes more serious. Consult a doctor if you^6,10: 

• Notice blood in your urine or persistent changes in urination. 
• Have swelling of your feet, ankles, hands, or around the eyes. 
• Experience ongoing fatigue, nausea, loss of appetite, or unexplained weight loss. 
• Have persistent shortness of breath or difficulty sleeping without an obvious cause. 
• Have diabetes, high blood pressure, heart disease, or a family history of kidney disease and have not had your kidney function checked recently. 
• Experience a sudden decrease in urine output, severe swelling, confusion, or difficulty breathing, as these may be signs of AKI and require immediate medical attention. 

Also Read: High Creatinine: Symptoms, Causes, Diagnosis & Treatment

Conclusion

Kidney disease is a common but often overlooked condition that can have serious health consequences if left untreated. Therefore, knowing the early signs of kidney disease and understanding your risk can help you act before significant kidney damage occurs.  

Remember, with timely medical care and healthy lifestyle choices, it is possible to protect your kidney function and maintain your overall health for years to come. 

Frequently Asked Question (FAQs)

References 

1. Whaley-Connell A, Nistala R, Chaudhary K. The Importance of Early Identification of Chronic Kidney Disease. Mo Med. 2011;108(1):25-28. https://pubmed.ncbi.nlm.nih.gov/21462606/

2. Your Kidneys & How They Work – NIDDK. National Institute of Diabetes and Digestive and Kidney Diseases. Accessed July 3, 2026. https://www.niddk.nih.gov/health-information/kidney-disease/kidneys-how-they-work 

3. Vaidya SR, Aeddula NR. Chronic Kidney Disease. In: StatPearls. StatPearls Publishing; 2026. Accessed July 3, 2026. http://www.ncbi.nlm.nih.gov/books/NBK535404/ 

4. Kidney disease. Accessed July 3, 2026. https://www.who.int/news-room/fact-sheets/detail/kidney-disease 

5. Global Facts: About Kidney Disease | National Kidney Foundation. Accessed July 3, 2026. https://www.kidney.org/global-facts-about-kidney-disease 

6. Acute kidney injury (AKI). nhs.uk. October 3, 2018. Accessed July 3, 2026. https://www.nhs.uk/conditions/acute-kidney-injury/ 

7. Khitan ZJ, Glassock RJ. Foamy Urine. Clin J Am Soc Nephrol CJASN. 2019;14(11):1664-1666. doi:10.2215/CJN.06840619 https://pubmed.ncbi.nlm.nih.gov/31575619/

8. 10 Signs You May Have Kidney Disease | National Kidney Foundation. Accessed July 3, 2026. https://www.kidney.org/news-stories/10-signs-you-may-have-kidney-disease 

9. Hematuria (Blood in the Urine) – NIDDK. Accessed July 6, 2026. https://www.niddk.nih.gov/health-information/urologic-diseases/hematuria-blood-urine 

10. Chronic kidney disease – Symptoms. nhs.uk. October 3, 2018. Accessed July 3, 2026. https://www.nhs.uk/conditions/kidney-disease/symptoms/ 

11. Wang KC, Lin LC, Pan SY, et al. Use of iodinated and gadolinium-based contrast media in patients with chronic kidney disease: Consensus statements from nephrologists, cardiologists, and radiologists at National Taiwan University Hospital. J Formos Med Assoc. 2026;125(3):261-267. doi:10.1016/j.jfma.2025.01.019 https://pubmed.ncbi.nlm.nih.gov/39870554/

12. Chronic kidney disease. nhs.uk. October 20, 2017. Accessed July 3, 2026. https://www.nhs.uk/conditions/kidney-disease/ 

13. KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease – PubMed. Accessed July 3, 2026. https://pubmed.ncbi.nlm.nih.gov/38490803/ 

14. Chronic kidney disease – Diagnosis. nhs.uk. October 20, 2017. Accessed July 3, 2026. https://www.nhs.uk/conditions/kidney-disease/diagnosis/ 

15. 8 Self-Care Ideas for People With Chronic Kidney Disease (CKD) | National Kidney Foundation. Accessed July 3, 2026. https://www.kidney.org/news-stories/8-self-care-ideas-people-kidney-disease 

16. Preventing Chronic Kidney Disease – NIDDK. National Institute of Diabetes and Digestive and Kidney Diseases. Accessed July 3, 2026. https://www.niddk.nih.gov/health-information/kidney-disease/chronic-kidney-disease-ckd/prevention 

17. Singer R, Huang H. Weight change in chronic kidney disease: Association with mortality and kidney function. Obes Sci Pract. 2023;10(1):e723. doi:10.1002/osp4.723 https://pubmed.ncbi.nlm.nih.gov/38264010/

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