Chronic Kidney Disease (CKD): Symptoms, Causes, Stages, Treatment and Prevention

 

Chronic kidney disease develops gradually over time and often has no symptoms in its early stages. Early detection and treatment can slow disease progression and protect kidney function.

Chronic kidney disease (CKD) is a long-term condition in which the kidneys gradually lose their ability to filter waste products and excess fluid from the blood. It often develops silently over several months or years and is commonly caused by diabetes, high blood pressure and other conditions that damage the kidneys. Although CKD cannot usually be cured, early diagnosis, healthy lifestyle changes and appropriate medical treatment can slow disease progression, reduce complications and improve quality of life.

What Is Chronic Kidney Disease?

Chronic kidney disease, commonly called CKD, is a condition in which the kidneys become damaged and gradually lose their ability to function properly over a period of months or years.

Healthy kidneys continuously remove waste products, excess water and toxins from the bloodstream while maintaining the body's balance of fluids, minerals and electrolytes. When kidney function declines, these waste products begin to accumulate in the body, affecting many organs and increasing the risk of serious health complications.

Unlike acute kidney injury, which develops suddenly and may be reversible, chronic kidney disease progresses slowly. In many people, the damage cannot be completely reversed once it has occurred. However, early diagnosis and appropriate treatment can significantly slow the progression of the disease and reduce the risk of kidney failure.

CKD has become a major public health problem worldwide. Millions of people are living with kidney disease, and many remain unaware because symptoms often do not appear until kidney function has declined substantially.

Why Healthy Kidneys Matter

Although many people think the kidneys only produce urine, these remarkable organs perform many essential functions that keep the body healthy.

Healthy kidneys:

• Remove waste products from the blood

• Filter excess water

• Maintain the balance of sodium, potassium and other electrolytes

• Help regulate blood pressure

• Produce hormones that stimulate red blood cell production

• Activate vitamin D for healthy bones

• Maintain acid-base balance

• Help regulate fluid volume throughout the body

Each kidney contains approximately one million microscopic filtering units called nephrons.

Inside each nephron is a cluster of tiny blood vessels known as the glomerulus, which acts like a highly selective filter.

Healthy glomeruli allow waste products and excess water to pass into the urine while keeping important substances such as:

• Albumin

• Other proteins

• Blood cells

• Essential nutrients

When these filters become damaged, protein and sometimes blood begin leaking into the urine.

This is why proteinuria is often one of the earliest signs of chronic kidney disease.

Read more:

Protein in Urine (Proteinuria): Overview, Causes, Symptoms and Treatment

https://anjkreb.blogspot.com/2018/01/protein-in-urine-proteinuria-overview.html

How Common Is Chronic Kidney Disease?

CKD affects hundreds of millions of people worldwide and continues to increase because of the growing burden of diabetes, hypertension and obesity.

Many people are diagnosed only after routine blood or urine tests because the condition usually develops silently.

In Nigeria and many other African countries, chronic kidney disease is becoming increasingly common due to:

• Rising rates of hypertension

• Increasing diabetes prevalence

• Delayed diagnosis

• Limited access to specialist kidney care

• Late presentation to hospitals

• Inappropriate use of certain medications and herbal preparations

Public awareness remains low, making early screening especially important for high-risk individuals.

What Causes Chronic Kidney Disease?

Chronic kidney disease develops when diseases or injuries damage the kidneys over time.

Several medical conditions can gradually destroy the kidney's filtering units.

Diabetes Mellitus

Diabetes is the leading cause of chronic kidney disease worldwide.

Persistently high blood sugar damages the small blood vessels inside the kidneys, reducing their ability to filter waste effectively.

Diabetic kidney disease often develops gradually over many years.

Early detection through urine testing and blood tests can slow progression significantly.

High Blood Pressure

Uncontrolled hypertension is another major cause of CKD.

High blood pressure damages delicate blood vessels throughout the kidneys.

Over time, the filtering units become scarred and lose their ability to function normally.

Good blood pressure control remains one of the most effective ways to protect kidney health.

Read more:

Why Are More Young People Developing High Blood Pressure? Causes, Warning Signs and Prevention

https://anjkreb.blogspot.com/2026/07/why-are-more-young-people-developing.html

Glomerulonephritis

Glomerulonephritis refers to inflammation of the kidney's filtering units.

The inflammation may result from:

• Autoimmune diseases

• Certain infections

• Immune disorders

Persistent inflammation gradually damages kidney tissue.

Polycystic Kidney Disease

This inherited condition causes numerous fluid-filled cysts to develop inside the kidneys.

As the cysts enlarge, they replace healthy kidney tissue and reduce kidney function.

Recurrent Kidney Infections

Repeated kidney infections may gradually scar kidney tissue and contribute to chronic kidney disease if left untreated.

Urinary Tract Obstruction

Long-term blockage of urine flow caused by:

• Kidney stones

• Enlarged prostate

• Tumours

• Congenital abnormalities

can gradually damage the kidneys.

Autoimmune Diseases

Several autoimmune diseases may affect kidney function, including:

• Lupus

• Vasculitis

• Rheumatoid arthritis

These conditions may attack kidney tissue directly or indirectly through chronic inflammation.

Long-Term Medication Use

Prolonged or excessive use of certain medicines may contribute to kidney damage.

Examples include:

• Some non-steroidal anti-inflammatory drugs (NSAIDs)

• Certain antibiotics

• Some chemotherapy medicines

• Certain contrast dyes used during imaging

Always use medicines according to professional medical advice.

Other Causes

Other possible causes include:

• Sickle cell disease

• Congenital kidney abnormalities

• Multiple myeloma

• Severe dehydration over prolonged periods

• Certain rare genetic disorders

Risk Factors for Chronic Kidney Disease

Although anyone can develop CKD, certain factors increase the likelihood.

Major risk factors include:

• Diabetes

• High blood pressure

• Proteinuria

• Obesity

• Older age

• Family history of kidney disease

• Smoking

• High cholesterol

• Cardiovascular disease

• Autoimmune disorders

• Frequent urinary tract infections

• Long-term NSAID use

• Sickle cell disease

Having one or more risk factors does not necessarily mean someone will develop CKD, but regular screening becomes especially important.

Can Chronic Kidney Disease Be Prevented?

Not every case can be prevented.

However, many of the leading causes are manageable.

Early detection of:

• Proteinuria

• Diabetes

• Hypertension

provides an opportunity to prevent or delay permanent kidney damage.

Routine health checks remain one of the most effective ways to identify kidney disease before symptoms appear.

People living with diabetes or hypertension should have regular kidney function tests even if they feel completely healthy.

Stages of Chronic Kidney Disease

Healthcare professionals classify chronic kidney disease into five stages based on the estimated Glomerular Filtration Rate (eGFR), a blood test that estimates how well the kidneys are filtering waste products.

Understanding these stages helps guide treatment and monitor disease progression.

Stage 1 CKD

eGFR: 90 mL/min/1.73m² or higher

At this stage, the kidneys are still filtering blood normally, but there is evidence of kidney damage such as:

• Protein in the urine (proteinuria)

• Blood in the urine

• Structural kidney abnormalities

• Abnormal imaging findings

Most people have no symptoms at this stage.

Treatment focuses on identifying and managing the underlying cause to prevent further damage.

Stage 2 CKD

eGFR: 60–89 mL/min/1.73m²

Kidney function is mildly reduced.

Many people continue to feel completely well.

Healthcare providers usually recommend:

• Blood pressure control

• Diabetes management

• Healthy eating

• Smoking cessation

• Regular monitoring of kidney function

Stage 3 CKD

Stage 3 is divided into two parts.

Stage 3a

eGFR: 45–59 mL/min/1.73m²

Stage 3b

eGFR: 30–44 mL/min/1.73m²

Waste products begin accumulating in the bloodstream.

Some people may develop symptoms including:

• Fatigue

• Mild swelling

• High blood pressure

• Changes in urination

Complications become more common, making regular follow-up increasingly important.

Stage 4 CKD

eGFR: 15–29 mL/min/1.73m²

Kidney function is now severely reduced.

Symptoms become more noticeable.

People may experience:

• Significant fatigue

• Loss of appetite

• Nausea

• Persistent swelling

• Itching

• Difficulty concentrating

• Bone disease

• Anaemia

Patients should begin discussing future treatment options, including dialysis and kidney transplantation.

Stage 5 CKD (Kidney Failure)

eGFR: Less than 15 mL/min/1.73m²

This is also called end-stage kidney disease (ESKD) or kidney failure.

The kidneys can no longer adequately remove waste products or excess fluid.

Without kidney replacement therapy, serious complications may occur.

Treatment may include:

• Dialysis

• Kidney transplantation

• Conservative supportive care in selected patients

Symptoms of Chronic Kidney Disease

One of the greatest challenges with CKD is that symptoms often appear only after significant kidney damage has already occurred.

Many people remain completely unaware they have kidney disease until routine blood or urine tests detect abnormalities.

Early Symptoms

In the early stages, symptoms may be mild or absent.

Some people may notice:

• Mild fatigue

• Foamy urine

• Frequent urination, especially at night

• Mild swelling around the eyes

• High blood pressure

• Difficulty concentrating

Because these symptoms are not specific, they are often overlooked.

Symptoms of Advanced CKD

As kidney function declines further, symptoms become more noticeable.

These include:

• Persistent tiredness

• Weakness

• Loss of appetite

• Nausea

• Vomiting

• Swollen feet and ankles

• Puffiness around the eyes

• Dry, itchy skin

• Muscle cramps

• Difficulty sleeping

• Shortness of breath

• Persistent bad taste in the mouth

• Reduced urine output

• Unexplained weight loss

• Difficulty concentrating

Advanced kidney disease affects many organs because waste products continue accumulating in the bloodstream.

Why Does CKD Cause Swelling?

Healthy kidneys regulate the body's fluid balance.

When kidney function declines:

• Excess water accumulates.

• Sodium retention increases.

• Protein may leak into the urine.

These changes allow fluid to build up in body tissues.

Swelling commonly develops in:

• Feet

• Ankles

• Legs

• Hands

• Face

• Eyelids

Some people may also develop fluid around the lungs, causing shortness of breath.

How Is Chronic Kidney Disease Diagnosed?

CKD is diagnosed using a combination of medical history, physical examination, urine tests, blood tests and imaging studies.

Early diagnosis is important because treatment can slow disease progression before permanent damage occurs.

Urine Dipstick Test

A urine dipstick provides a quick screening test for:

• Protein

• Blood

• Glucose

• Signs of infection

Protein detected on a dipstick usually requires further evaluation.

Read:

Protein in Urine (Proteinuria): Overview, Causes, Symptoms and Treatment

https://anjkreb.blogspot.com/2018/01/protein-in-urine-proteinuria-overview.html

Urine Albumin-to-Creatinine Ratio (ACR)

The ACR measures small amounts of albumin leaking into the urine.

It is particularly useful for:

• Diabetes

• Hypertension

• Early kidney disease

This test can detect kidney damage before symptoms appear.

Blood Tests

Important blood investigations include:

• Serum creatinine

• Estimated Glomerular Filtration Rate (eGFR)

• Blood urea nitrogen (BUN)

• Electrolytes

• Blood glucose

• HbA1c

• Full blood count

These tests help assess kidney function and identify complications such as anaemia or electrolyte imbalance.

Blood Pressure Measurement

High blood pressure is both a cause and a consequence of CKD.

Blood pressure should be checked regularly.

Read:

Why Are More Young People Developing High Blood Pressure?

https://anjkreb.blogspot.com/2026/07/why-are-more-young-people-developing.html

Kidney Ultrasound

Ultrasound provides information about:

• Kidney size

• Kidney structure

• Kidney cysts

• Kidney stones

• Urinary obstruction

It is painless and commonly used during CKD evaluation.

Kidney Biopsy

Some patients require a kidney biopsy to determine the exact cause of kidney damage.

A small tissue sample is removed using a needle and examined under a microscope.

A biopsy may be recommended when:

• Kidney function declines rapidly.

• Significant proteinuria is present.

• Blood appears in the urine.

• Autoimmune disease is suspected.

• The diagnosis remains uncertain.

Treatment of Chronic Kidney Disease

There is currently no cure for most cases of chronic kidney disease.

However, treatment can:

• Slow disease progression

• Reduce symptoms

• Prevent complications

• Improve quality of life

• Delay kidney failure

Treatment depends on the underlying cause and stage of CKD.

Managing the Underlying Cause

The first step is treating the condition responsible for kidney damage.

Examples include:

• Better diabetes control

• Blood pressure management

• Treatment of kidney inflammation

• Managing autoimmune diseases

• Treating urinary tract obstruction

• Treating infections

Controlling the underlying disease often slows further kidney damage.

Blood Pressure Control

Good blood pressure control is one of the most effective ways to protect kidney function.

Healthcare professionals commonly prescribe:

• ACE inhibitors

• Angiotensin receptor blockers (ARBs)

These medicines:

• Lower blood pressure

• Reduce proteinuria

• Protect kidney function

• Slow CKD progression

Regular monitoring is important because these medicines can affect kidney function and blood potassium levels.

Diabetes Management

People with diabetes should aim for excellent blood sugar control.

This includes:

• Healthy eating

• Regular physical activity

• Medication adherence

• Regular HbA1c testing

• Routine kidney screening

Good diabetes control significantly reduces the risk of kidney complications.

Medicines Used in CKD

Depending on individual needs, treatment may include medicines to:

• Lower blood pressure

• Control blood sugar

• Reduce cholesterol

• Treat anaemia

• Correct mineral and bone disorders

• Reduce fluid retention with diuretics

• Manage electrolyte abnormalities

Patients should never start or stop medicines without consulting their healthcare provider.

Regular Monitoring

Living with CKD requires ongoing follow-up.

Healthcare providers usually monitor:

• Kidney function

• Blood pressure

• Urine protein

• Blood sugar

• Electrolytes

• Haemoglobin

• Body weight

Regular monitoring allows treatment to be adjusted before complications develop.

Lifestyle Changes That Protect Kidney Function

Lifestyle changes are an important part of managing chronic kidney disease. Healthy habits can help slow disease progression, reduce complications and improve overall health.

Healthcare professionals often recommend:

• Maintain a healthy body weight.

• Exercise regularly.

• Eat a balanced diet.

• Reduce salt intake.

• Avoid smoking and tobacco products.

• Limit alcohol consumption.

• Stay physically active.

• Take prescribed medicines as directed.

• Monitor blood pressure regularly.

• Keep diabetes under good control.

• Attend regular medical follow-up appointments.

Even small improvements in lifestyle can make a meaningful difference in preserving kidney function over time.

Read more:

Best 5 Weight Loss Tips: Five Natural Ways to Lose Weight

https://anjkreb.blogspot.com/2018/01/best-5-weight-loss-tips-5-natural-ways.html

10,000 Steps a Day: Benefits of Taking a Walk

https://anjkreb.blogspot.com/2025/05/10000-steps-day-benefits-of-taking-walk.html

Plant-Based vs Mediterranean Diet: Which Is Better for Long-Term Health?

https://anjkreb.blogspot.com/2025/05/plant-based-vs-mediterranean-diet-which.html

Diet for Chronic Kidney Disease

A healthy diet helps reduce the workload on the kidneys and supports overall health.

General dietary recommendations include:

• Eat plenty of vegetables and fruits where appropriate.

• Choose whole grains over refined grains.

• Reduce foods high in salt (sodium).

• Limit processed and packaged foods.

• Choose lean protein sources.

• Avoid excessive sugary drinks.

• Maintain a healthy weight.

As kidney disease progresses, some people may need to limit protein, potassium, phosphorus or fluid intake. These dietary changes should only be made under the guidance of a healthcare professional or renal dietitian.

There is no single "kidney diet" suitable for everyone. Dietary advice should always be individualized based on kidney function, blood test results and other medical conditions.

What Is Dialysis?

Dialysis is a treatment that replaces some of the functions of the kidneys when they can no longer filter waste products and excess fluid effectively.

Dialysis does not cure chronic kidney disease, but it helps people with advanced kidney failure live longer and maintain a better quality of life.

There are two main types of dialysis.

Haemodialysis

Haemodialysis uses a machine and a special filter to remove waste products, excess water and toxins from the blood.

Treatment is usually performed several times each week in a dialysis centre, although some patients may receive home haemodialysis under specialist supervision.

Peritoneal Dialysis

Peritoneal dialysis uses the lining of the abdomen, called the peritoneum, as a natural filter.

A special dialysis fluid is introduced into the abdominal cavity through a catheter, where it absorbs waste products before being drained away.

This method allows greater flexibility for some patients and may be performed at home after appropriate training.

Your healthcare team will recommend the most appropriate dialysis option based on your medical condition, lifestyle and personal preferences.

Kidney Transplantation

For many people with end-stage kidney disease, a kidney transplant offers the best long-term treatment option.

During transplantation, a healthy kidney from a living or deceased donor is surgically placed into the recipient.

A successful transplant can:

• Restore kidney function.

• Improve quality of life.

• Remove the need for long-term dialysis.

• Improve survival for many patients.

However, transplantation is not suitable for everyone. Patients require careful evaluation before surgery and lifelong medication to prevent rejection of the transplanted kidney.

Possible Complications of Chronic Kidney Disease

Without appropriate treatment, CKD may lead to several serious complications.

These include:

• Kidney failure

• Persistent high blood pressure

• Heart disease

• Heart failure

• Stroke

• Anaemia

• Bone disease

• Electrolyte imbalance

• Fluid overload

• Swelling of the legs and lungs

• Reduced immunity

• Malnutrition

• Nerve damage

• Pregnancy complications

• Premature death

Many of these complications can be prevented or delayed through early diagnosis, regular monitoring and appropriate treatment.

Can Chronic Kidney Disease Be Prevented?

Although not all cases of CKD are preventable, many can be delayed or avoided by addressing the major risk factors.

Practical steps include:

• Keep blood pressure under control.

• Manage diabetes effectively.

• Have regular urine and kidney function tests.

• Maintain a healthy body weight.

• Exercise regularly.

• Eat a balanced diet.

• Reduce salt intake.

• Stay hydrated unless advised otherwise.

• Avoid smoking.

• Limit alcohol consumption.

• Avoid unnecessary long-term use of NSAIDs.

• Seek prompt treatment for kidney infections.

• Attend routine medical check-ups.

Early detection remains one of the most effective ways to prevent irreversible kidney damage.

When Should You See a Doctor?

Seek medical advice if you experience:

• Persistent swelling of the feet, ankles or face

• Persistent foamy urine

• Blood in the urine

• High blood pressure

• Diabetes with abnormal urine tests

• Persistent fatigue

• Difficulty passing urine

• Recurrent urinary tract infections

• A family history of kidney disease

Seek urgent medical care if you develop:

• Severe shortness of breath

• Chest pain

• Confusion

• Very little or no urine

• Severe swelling

• Persistent vomiting

• Sudden worsening of kidney function

Common Myths About Chronic Kidney Disease

Myth: Kidney disease always causes pain.

Fact: Most people with chronic kidney disease experience no pain during the early stages.

Myth: Only older adults develop CKD.

Fact: Chronic kidney disease can affect adults of any age and occasionally children, especially when risk factors such as diabetes, hypertension or inherited kidney disorders are present.

Myth: If I feel well, my kidneys must be healthy.

Fact: Early CKD often causes no symptoms. Routine screening is essential for people at increased risk.

Myth: Drinking large amounts of water cures kidney disease.

Fact: Adequate hydration is important, but drinking excessive water does not reverse chronic kidney disease.

Myth: Herbal medicines are always safe for the kidneys.

Fact: Some herbal products may contain substances that can damage the kidneys or interact with prescribed medicines. Always discuss herbal supplements with a qualified healthcare professional.

Frequently Asked Questions

What is the leading cause of chronic kidney disease?

Diabetes is the leading cause worldwide, followed closely by high blood pressure.

Can chronic kidney disease be cured?

Most cases cannot be cured, but early treatment can slow progression and reduce complications.

Is CKD the same as kidney failure?

No. Kidney failure is the most advanced stage of chronic kidney disease. Many people with CKD never progress to kidney failure, especially with appropriate treatment.

Can CKD be prevented?

Many cases can be prevented or delayed by controlling blood pressure, managing diabetes, maintaining a healthy lifestyle and attending regular health screenings.

Can CKD cause high blood pressure?

Yes. Kidney disease and high blood pressure influence each other. CKD can increase blood pressure, while uncontrolled hypertension can further damage the kidneys.

Is dialysis permanent?

Some people require dialysis long-term, while others may receive a kidney transplant. The treatment plan depends on the cause and severity of kidney disease.

Can exercise help people with CKD?

Yes. Regular physical activity improves heart health, blood pressure control and overall well-being. Exercise plans should be tailored to individual health status and discussed with a healthcare professional.

Does everyone with proteinuria develop CKD?

No. Temporary proteinuria may occur after exercise, dehydration or fever. Persistent proteinuria, however, requires medical evaluation because it may indicate early kidney disease.

Key Takeaways

• Chronic kidney disease is a long-term condition in which the kidneys gradually lose their ability to filter blood effectively.

• Diabetes and high blood pressure are the leading causes of CKD.

• Early kidney disease often develops without symptoms.

• Routine urine and blood tests are essential for early detection.

• Protein in the urine may be an early warning sign of kidney damage.

• Healthy lifestyle choices help slow disease progression.

• Good blood pressure and blood sugar control protect kidney function.

• Advanced CKD may require dialysis or kidney transplantation.

• Early diagnosis significantly improves long-term outcomes.

Continue Reading on AnjKreb

Continue exploring evidence-based health information:

Protein in Urine (Proteinuria): Overview, Causes, Symptoms and Treatment
https://anjkreb.blogspot.com/2018/01/protein-in-urine-proteinuria-overview.html

Why Are More Young People Developing High Blood Pressure? Causes, Warning Signs and Prevention
https://anjkreb.blogspot.com/2026/07/why-are-more-young-people-developing.html

Best 5 Weight Loss Tips: Five Natural Ways to Lose Weight
https://anjkreb.blogspot.com/2018/01/best-5-weight-loss-tips-5-natural-ways.html

10,000 Steps a Day: Benefits of Taking a Walk
https://anjkreb.blogspot.com/2025/05/10000-steps-day-benefits-of-taking-walk.html

Plant-Based vs Mediterranean Diet: Which Is Better for Long-Term Health?
https://anjkreb.blogspot.com/2025/05/plant-based-vs-mediterranean-diet-which.html

Artificial Intelligence in African Healthcare: Opportunities and Challenges
https://anjkreb.blogspot.com/2026/07/artificial-intelligence-in-african.html

Digital Health Apps for Chronic Disease Management
https://anjkreb.blogspot.com/2026/08/digital-health-apps-for-chronic-disease.html

Conclusion

Chronic kidney disease is a growing global health challenge that often develops silently, making early detection essential. Many people do not experience symptoms until kidney function has declined significantly, which is why routine screening is especially important for individuals with diabetes, high blood pressure, obesity or a family history of kidney disease.

Although CKD cannot usually be cured, it can often be managed successfully. Controlling blood pressure and blood sugar, eating a healthy diet, staying physically active, avoiding smoking and attending regular medical check-ups can significantly slow disease progression and reduce the risk of kidney failure. For those with advanced disease, treatments such as dialysis and kidney transplantation can improve both survival and quality of life.

The most effective approach is prevention. Understanding your personal risk factors, recognising early warning signs and seeking medical care promptly can help protect your kidneys for years to come. Healthy kidneys are vital to overall health, and taking steps today can make a meaningful difference in your future well-being.

References

1. Kidney Disease: Improving Global Outcomes (KDIGO). KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease. https://kdigo.org/guidelines/chronic-kidney-disease/

2. World Health Organization. Kidney Health and Chronic Kidney Disease. https://www.who.int

3. National Kidney Foundation. About Chronic Kidney Disease. https://www.kidney.org

4. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK). Chronic Kidney Disease. https://www.niddk.nih.gov/health-information/kidney-disease

5. Centers for Disease Control and Prevention. Chronic Kidney Disease Initiative. https://www.cdc.gov/kidneydisease/

Medical Disclaimer

This article is intended for educational purposes only and should not replace professional medical advice, diagnosis or treatment. If you have symptoms of kidney disease, abnormal urine or blood test results, diabetes, high blood pressure or concerns about your kidney health, consult a qualified healthcare professional. Never delay seeking medical care or stop prescribed medication based on information from this article.