Chronic Kidney Disease

Introduction

A diagnosis of chronic kidney disease (CKD) often comes as a surprise. Many people learn about it from a routine blood or urine test rather than from feeling unwell, and the questions that follow can feel overwhelming — what does this mean for daily life, for medications, for diet, for the future? Will dialysis be needed? Will a transplant be required?

This guide is written for people who have been told they have CKD, or whose doctor has raised the possibility based on test results. It explains what CKD is, how it is staged, how it is managed across its different stages, and what to expect over time. The aim is to help you understand the medical landscape so you can have informed conversations with your nephrologist (a kidney specialist) and your wider care team.

CKD is a long-term condition, but it is not a fixed sentence. For many people, careful management can slow the disease for years and reduce the risk of complications. The earlier CKD is identified and the more consistent the care, the better the outlook tends to be.

What Is Chronic Kidney Disease?

Chronic kidney disease is the gradual loss of this filtering function over months or years. Doctors describe CKD as either evidence of kidney damage (such as protein in the urine or abnormal kidney imaging) or a reduced filtering rate — or both — lasting for at least three months.

Understanding Key Kidney Terms

A few terms come up repeatedly in CKD care:

• Creatinine: a waste product made by muscles. Healthy kidneys clear it from the blood. Higher blood levels usually indicate reduced kidney function.
• eGFR (estimated glomerular filtration rate): a number calculated from your blood creatinine, age, and sex that estimates how well your kidneys filter blood. It is reported in millilitres per minute. A healthy eGFR is around 90 or above.
• Albuminuria or proteinuria: protein in the urine. Even small amounts of albumin in the urine indicate kidney damage and predict faster progression.
• ACR (albumin-to-creatinine ratio): a urine test that measures albumin loss precisely.

Stages of CKD

• Stage 1: eGFR 90 or above, with evidence of kidney damage (such as protein in urine).
• Stage 2: eGFR 60–89, with kidney damage.
• Stage 3a: eGFR 45–59. Mild to moderate loss of function.
• Stage 3b: eGFR 30–44. Moderate to severe loss.
• Stage 4: eGFR 15–29. Severe loss of function. Planning for dialysis or transplant typically begins here.
• Stage 5: eGFR below 15. Kidney failure. Dialysis or transplant is usually needed.

Stages 1 and 2 often have no symptoms and may be picked up only on routine testing. By Stage 3, more people start to notice changes. By Stages 4 and 5, symptoms become more pronounced and planning for advanced therapies becomes a central part of care.

Causes and Risk Factors

CKD is usually the result of long-standing conditions that quietly damage the kidneys over years.

Most Common Causes

• Diabetes: the single most common cause of CKD worldwide. Persistently high blood sugar damages the tiny filtering blood vessels in the kidneys.
• High blood pressure (hypertension): sustained high pressure scars kidney blood vessels and the filtering units (glomeruli) over time.
• Glomerulonephritis: a group of conditions in which the kidney’s filtering units become inflamed.
• Polycystic kidney disease (PKD): an inherited condition in which fluid-filled cysts gradually replace normal kidney tissue.
• Recurrent kidney infections or obstruction: repeated infections, kidney stones, or blockages in the urinary tract.
• Long-term use of certain medications: particularly non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen and diclofenac, used frequently and over long periods.

Risk Factors

Even without a specific cause, certain factors raise the risk of CKD:

• Family history of kidney disease
• Older age
• Obesity
• Smoking
• Cardiovascular disease
• Autoimmune conditions such as lupus
• A history of acute kidney injury
• Low birth weight

South Asian and several other populations also have a higher background risk of diabetes and hypertension, which feeds into a higher overall risk of CKD.

Signs and Symptoms

CKD often develops silently. In the early stages, blood and urine tests may be the only indicators. As the disease progresses, a range of symptoms can appear, though their pattern varies widely between people.

Early Stages

• No symptoms at all in many cases
• Tiredness
• Increased need to urinate at night
• Mild puffiness around the ankles
• Reduced appetite

More Advanced Disease

• Swelling in the legs, face, or hands
• Shortness of breath, especially on exertion or when lying flat
• Persistent nausea or vomiting
• Muscle cramps, often at night
• Itching that is difficult to relieve
• Difficulty concentrating, mental fog, or poor sleep
• Reduced urine output
• A metallic taste in the mouth or loss of appetite for meat

If you already have a CKD diagnosis and notice rapid worsening of swelling, breathlessness, severe vomiting, very reduced urine output, or confusion, contact your nephrology team or seek urgent medical care. Sudden changes can indicate either fast progression or a separate problem on top of CKD that needs prompt attention.

Diagnosis

CKD is diagnosed and staged through a combination of blood tests, urine tests, imaging, and occasionally a kidney biopsy. Because eGFR and urine protein can fluctuate, doctors usually confirm CKD by repeating abnormal results after at least three months.

Blood Tests

• Serum creatinine and eGFR: the foundation of CKD staging.
• Electrolytes: sodium, potassium, and bicarbonate levels, which can shift as kidney function falls.
• Calcium, phosphate, and parathyroid hormone: to assess bone and mineral balance.
• Haemoglobin: to look for anaemia, common in later-stage CKD.
• HbA1c, lipid profile: to assess diabetes control and cardiovascular risk.

Urine Tests

• Urine albumin-to-creatinine ratio (ACR): a sensitive measure of kidney damage and a strong predictor of progression.
• Urine dipstick and microscopy: to look for blood, infection, or abnormal cells.

Imaging

• Kidney ultrasound: to check kidney size, shape, and for stones, cysts, or obstruction.
• CT or MRI: in selected situations, for more detailed assessment.

Kidney Biopsy

A biopsy involves taking a small piece of kidney tissue with a fine needle under ultrasound guidance. It is not needed for everyone. Nephrologists typically consider biopsy when the cause of kidney disease is unclear, when an autoimmune or inflammatory process is suspected, or when the result will change treatment.

Treatment and Management

CKD treatment has three broad aims: slow the loss of kidney function, prevent and manage complications, and prepare for dialysis or transplant if and when that becomes necessary. The specific plan depends on the underlying cause, the stage, other medical conditions, and individual preferences.

Treating the Underlying Cause

Wherever possible, treating the condition that is damaging the kidneys is central:

• Tight blood sugar control in diabetes, with targets set by your endocrinologist or nephrologist.
• Blood pressure control, usually with a target around 120–130 mmHg systolic in many adults with CKD, though individualised.
• Treatment of glomerulonephritis with immune-modulating medications when appropriate.
• Relief of urinary obstruction by treating stones or anatomical problems.

Medications That Protect the Kidneys

Several classes of medication have been shown in large clinical trials to slow CKD progression. Current major guidelines, including those from KDIGO, describe these as cornerstones of CKD care for many patients:

• ACE inhibitors and angiotensin receptor blockers (ARBs): reduce protein loss in the urine and lower blood pressure. They are widely used in CKD with proteinuria, particularly in diabetic kidney disease.
• SGLT2 inhibitors: originally developed for diabetes, this class (drugs ending in “-flozin”) has been shown to slow CKD progression in both diabetic and non-diabetic CKD and to reduce cardiovascular events.
• Non-steroidal mineralocorticoid receptor antagonists such as finerenone: increasingly used in diabetic CKD with proteinuria to slow progression and reduce heart risk.
• Statins: to reduce cardiovascular risk, which is high in CKD.

Whether each of these is appropriate for you depends on your stage, potassium level, blood pressure, and other factors. Your nephrologist will review and adjust them over time.

Managing Complications

As CKD advances, additional treatments address its knock-on effects:

• Anaemia: low iron stores are corrected first; erythropoiesis-stimulating agents (ESAs) or newer oral HIF-PHI medicines may be used in some patients.
• Bone and mineral disease: phosphate binders, active vitamin D, and sometimes medications to lower parathyroid hormone help protect bones and blood vessels.
• Acidosis: oral sodium bicarbonate may be used when blood becomes too acidic.
• Fluid overload: diuretics (water tablets) help when swelling and breathlessness develop.
• High potassium: dietary changes and sometimes potassium-binding medications.

Avoiding Further Kidney Injury

Certain medications and contrast agents can worsen kidney function. Common things to discuss with your doctor include:

• NSAIDs (such as ibuprofen, diclofenac, naproxen) used regularly or in higher doses
• Some antibiotics
• Iodinated contrast used for CT scans — not contraindicated, but used with planning in advanced CKD
• Certain herbal preparations and over-the-counter painkillers

Dialysis takes over part of the filtering work of the kidneys when they can no longer keep up — usually in Stage 5 CKD, sometimes earlier if complications are severe. It does not cure CKD; it replaces a portion of the lost function. Nephrologists usually begin preparing patients for dialysis well before it is needed, often during Stage 4.

• Haemodialysis: blood is pumped through a machine with a filter and returned to the body. Most commonly done in a dialysis centre three times a week, for around four hours each session. Home haemodialysis is available in some settings.
• Peritoneal dialysis: a special fluid is run into the abdomen through a small tube (catheter), where the lining of the abdomen acts as a natural filter. It is typically done daily at home, either through several manual exchanges during the day (CAPD) or overnight using a machine (APD).

Each form has practical and medical trade-offs — lifestyle, distance from a dialysis centre, ability to manage equipment at home, presence of other illnesses, and personal preference all matter. Nephrology teams typically present both options and help match them to individual circumstances.

Preparing for haemodialysis usually involves creating an arteriovenous (AV) fistula in the arm — a connection between an artery and a vein that strengthens the vein for repeated needle access. This is done weeks to months before dialysis is expected to start, because the fistula needs time to mature.

Kidney Transplant

For many people with kidney failure, a kidney transplant offers a level of function and freedom that dialysis cannot match. Major nephrology guidelines describe transplant as the treatment of choice for suitable candidates with end-stage kidney disease, when a donor kidney is available and the patient is medically fit for surgery and the long-term immunosuppression that follows.

Transplant kidneys may come from:

• A living donor, often a close family member or, under regulated conditions in India, an approved related donor.
• A deceased donor, through the national deceased donor programme.

In India, kidney transplantation is regulated under the Transplantation of Human Organs and Tissues Act (THOTA). Evaluation involves detailed medical, surgical, and psychological assessment of both recipient and donor, including tissue and blood group matching.

After transplant, lifelong immunosuppressive medication is needed to prevent rejection. Regular follow-up monitors kidney function, drug levels, and side effects such as infections, diabetes, and certain cancers. When successful, a transplant typically restores most kidney function, but the transplanted kidney itself can be affected by CKD over years, so ongoing kidney-protective care continues.

Conservative Management

For some people — particularly older adults with several other serious medical conditions — dialysis or transplant may not improve quality or length of life. In these situations, conservative (non-dialysis) management focuses on controlling symptoms, slowing progression as much as possible, and supportive care. This is a legitimate, planned approach and should be discussed openly when relevant.

Lifestyle and Self-Management

Day-to-day choices have a real impact on how CKD progresses. The areas with the strongest evidence are diet, physical activity, blood pressure, smoking, and careful medication use.

Diet

Diet in CKD is individualised. There is no single “CKD diet” that fits everyone. A renal dietitian can tailor recommendations to your stage, lab values, other conditions, cultural preferences, and food availability. General principles that come up often include:

• Salt (sodium): reducing salt helps control blood pressure and swelling. Most guidelines suggest under 5–6 grams of salt per day (about one teaspoon), with much of it coming from processed foods rather than the salt shaker.
• Protein: a moderate intake is usually advised — not very high, but enough to maintain muscle and nutrition. Very low-protein diets are not routinely recommended.
• Potassium: in advanced CKD or when blood potassium runs high, limits on high-potassium foods (such as bananas, oranges, tomatoes, coconut water, and certain leafy vegetables) may be needed. In earlier stages, restriction is often not necessary.
• Phosphorus: processed foods and cola-type drinks contain phosphorus additives that are easily absorbed and can be problematic in later CKD. Whole foods are usually preferable.
• Fluids: in early CKD, normal fluid intake is fine. In advanced stages, especially on dialysis, fluid limits may be set.

Physical Activity

Regular activity helps blood pressure, blood sugar, weight, mood, and heart health. Most people with CKD can do moderate exercise such as walking, cycling, or swimming. If you have heart disease, severe anaemia, or are on dialysis, ask your team about appropriate intensity and any precautions.

Smoking and Alcohol

Smoking accelerates CKD progression and dramatically raises cardiovascular risk. Stopping smoking is one of the single most useful changes for kidney and heart health. Alcohol should be limited; heavy drinking raises blood pressure and can interact with medications.

Weight

Maintaining a healthy weight reduces strain on the kidneys, improves blood sugar and blood pressure, and lowers cardiovascular risk. Where weight loss is appropriate, gradual change supported by your team is more sustainable than crash diets.

Vaccinations and Infection Prevention

People with CKD are at higher risk of severe infections. Influenza, pneumococcal, hepatitis B, and COVID-19 vaccinations are routinely recommended in CKD, particularly before dialysis or transplant. Discuss the schedule with your nephrologist.

Monitoring and Targets

• Stage 1–2: often once a year, sometimes with the primary care doctor.
• Stage 3: every 6–12 months, more often if function is changing.
• Stage 4: every 3–6 months, with a nephrologist involved.
• Stage 5 (not yet on dialysis): every 1–3 months, with planning for renal replacement therapy.
• On dialysis: contact with the dialysis team several times a week.

What Is Monitored

• eGFR and creatinine
• Urine albumin-to-creatinine ratio
• Electrolytes, especially potassium and bicarbonate
• Haemoglobin and iron studies
• Calcium, phosphate, vitamin D, and parathyroid hormone
• Blood pressure (often including home readings)
• Blood sugar control if you have diabetes
• Weight and signs of fluid retention

General Targets

Targets are individualised, but typical aims include:

• Blood pressure: usually under 130/80 mmHg, sometimes lower in people with significant proteinuria.
• HbA1c: commonly around 7% in many adults with diabetic CKD, with looser targets in older or frailer patients.
• Urine albumin-to-creatinine ratio: reducing it as much as possible.
• LDL cholesterol: lowered to reduce cardiovascular risk.

Complications

CKD affects more than just the kidneys. Many of its most serious consequences come from its effects on the rest of the body.

Cardiovascular Disease

People with CKD have a substantially higher risk of heart attacks, heart failure, strokes, and abnormal heart rhythms than people of the same age without CKD. Much of CKD care is, indirectly, heart protection — blood pressure control, statins, SGLT2 inhibitors, and lifestyle measures all reduce cardiovascular risk.

Anaemia

Bone and Mineral Disorders

CKD disturbs the balance of calcium, phosphate, vitamin D, and parathyroid hormone. Over time, this can weaken bones and contribute to calcium deposits in blood vessels. Management combines dietary changes, phosphate binders, and active vitamin D analogues where indicated.

High Potassium (Hyperkalaemia)

High blood potassium can cause dangerous heart rhythm problems. It is managed through diet, review of medications (some kidney-protective drugs raise potassium), and sometimes potassium-binding medications.

Fluid Overload

When the kidneys cannot remove enough fluid, swelling and breathlessness can develop. Diuretics, salt restriction, and ultimately dialysis address this.

Acidosis

The kidneys help maintain the blood’s acid balance. In CKD, the blood can become more acidic, which over time may worsen bone disease, muscle loss, and progression of CKD itself. Oral bicarbonate is sometimes prescribed.

Increased Infection Risk

Immune function is reduced in advanced CKD, particularly on dialysis. Catheter and fistula sites can become infected. Vaccinations and good hygiene are part of routine care.

Living with Chronic Kidney Disease

A CKD diagnosis brings practical adjustments but does not mean giving up your normal life. Most people with early to moderate CKD continue to work, travel, exercise, and look after their families much as before.

Work and Daily Life

In Stages 1–3, work is usually unaffected. In Stage 4, more frequent appointments and fatigue may require some adjustment. People on dialysis often arrange schedules around their sessions; home dialysis, where suitable, offers more flexibility. After a successful transplant, most people return to work and full activity.

Travel

People with CKD can travel, including internationally. Carrying a clear summary of your diagnosis, medications, recent lab results, and your nephrologist’s contact details is helpful. For people on haemodialysis, dialysis at a centre in the destination can usually be arranged in advance.

Mental Health and Support

Living with a long-term condition affects mental health. Anxiety about progression, fatigue, dietary restrictions, and the prospect of dialysis or transplant are common. Speaking openly with your team, connecting with patient support groups, and seeking counselling when needed are all part of comprehensive CKD care. Depression is under-recognised in CKD and is treatable.

Family and Relationships

CKD affects families too, especially when caregiving is involved. Honest conversations about the condition, plans for treatment, and shared decision-making help reduce the burden on any one person. For inherited conditions such as polycystic kidney disease, family members may benefit from screening.

Fertility and Pregnancy

Fertility can be reduced in advanced CKD but often improves after transplant. Pregnancy in CKD is possible but is considered higher risk and benefits from joint planning between nephrology and obstetric teams well before conception. Some medications used in CKD are not safe in pregnancy and need to be reviewed.

Chronic Kidney Disease in Children

CKD in children is less common than in adults but has important differences in causes, presentation, and care.

Causes

In children, the most common causes are:

• Congenital anomalies of the kidney and urinary tract (CAKUT): structural problems present from birth, such as obstruction or absent or small kidneys.
• Inherited kidney diseases: including polycystic kidney disease and Alport syndrome.
• Glomerular diseases: such as focal segmental glomerulosclerosis.
• Recurrent urinary tract infections with reflux from the bladder back to the kidneys.

Presentation

Children with CKD may present with poor growth, low energy, frequent infections, abnormal blood pressure, or simply incidental findings on tests done for other reasons. Growth and development are major concerns and are tracked carefully.

Treatment

Care is led by paediatric nephrologists and combines:

• Treating the underlying condition where possible
• Blood pressure and proteinuria control
• Nutrition support to promote growth
• Growth hormone therapy in selected children
• Management of bone health, anaemia, and electrolyte balance
• Dialysis and transplant when needed, with transplant generally preferred for children when feasible

Psychological support, schooling, and family involvement are central. Transition from paediatric to adult nephrology services is a planned process that typically begins in the mid-teen years.

Preventing Progression and Complications

Because CKD usually progresses gradually, there are many opportunities to slow it down and to prevent complications. The most impactful steps are typically:

• Keeping blood pressure within the agreed target range
• Managing diabetes carefully, with current guideline-based medications
• Taking kidney- and heart-protective medications consistently
• Avoiding regular NSAID use and other kidney-harmful medications without medical advice
• Not smoking
• Maintaining a healthy weight
• Attending follow-up appointments and lab tests on schedule
• Promptly treating urinary infections and discussing recurrent stones
• Keeping up with vaccinations

For families with inherited kidney disease, genetic counselling and screening of relatives can identify CKD earlier, when intervention is most effective.

When to Seek Urgent Care

People living with CKD should know which symptoms warrant urgent contact with their team or emergency services. These include:

• Sudden, severe swelling, especially with breathlessness
• Chest pain or new significant breathlessness
• Confusion, severe drowsiness, or new seizures
• Very reduced or absent urine output
• Persistent vomiting that prevents medication intake
• Signs of infection at a dialysis catheter, fistula, or transplant wound — redness, swelling, pus, or fever
• Fever above 38°C in someone on immunosuppression after transplant
• Severe muscle weakness or palpitations, which can suggest high potassium

Carrying a simple medical summary card with your CKD stage, key medications, and team contact details is a practical step that helps in any urgent situation.

Frequently Asked Questions

Can chronic kidney disease be cured?

In most cases, CKD cannot be reversed. However, progression can often be slowed substantially, and for some early or inflammatory causes, the underlying disease can be brought into remission. A successful kidney transplant restores most kidney function, but is a treatment rather than a cure — ongoing care is still needed.

Will I definitely need dialysis?

No. Many people with CKD never require dialysis, particularly when the disease is caught early and managed well. Dialysis becomes likely in Stage 5 CKD, but the rate at which CKD progresses varies widely between individuals. Your nephrologist can give you a more personalised estimate based on your trajectory.

How fast does CKD usually progress?

Progression varies. Some people lose kidney function slowly over many years; others, particularly those with poorly controlled diabetes, high blood pressure, or significant proteinuria, progress faster. Trends in your eGFR and urine protein over time are more informative than any single value.

Is a transplant better than dialysis?

For people who are medically suitable, major nephrology guidelines describe transplant as offering better long-term function, quality of life, and survival than long-term dialysis. However, transplant involves surgery, lifelong immunosuppression, and risks of its own. Whether transplant is appropriate is a clinical decision based on overall health, donor availability, and individual circumstances.

How often should I see a nephrologist?

This depends on your stage and how stable your kidney function is — ranging from once a year in early CKD to monthly or more often in advanced stages or on dialysis. Your team will set a schedule and adjust it as needed.

Are there any medications I should avoid?

Regular use of NSAIDs (such as ibuprofen, diclofenac, and naproxen) is generally discouraged in CKD. Several other medications need dose adjustments based on kidney function. Always tell any new doctor or pharmacist that you have CKD, and ask before starting over-the-counter painkillers or herbal preparations.

Is it safe to exercise with CKD?

For most people with CKD, regular moderate exercise is encouraged and is good for blood pressure, blood sugar, mood, and heart health. People with significant heart disease, severe anaemia, or on dialysis may need specific guidance on intensity.

Can I become pregnant if I have CKD?

Pregnancy is possible in CKD but is considered higher risk, especially in more advanced stages. Pre-pregnancy planning with both your nephrologist and an obstetrician is important, because some CKD medications must be changed before conception, and blood pressure and kidney function need careful monitoring throughout pregnancy.

Does CKD always cause symptoms?

No. Many people in early CKD feel completely well, which is why screening of people with diabetes, high blood pressure, or a family history of kidney disease is so important. Symptoms tend to appear in later stages.

Conclusion

Chronic kidney disease is a long-term condition, but it is one in which active care makes a measurable difference. Understanding your stage, the cause of your CKD, and the targets your team is working towards puts you in a strong position to influence the course of the disease. Most of the day-to-day work of CKD care — taking medications consistently, attending follow-up, keeping blood pressure and blood sugar in range, not smoking, eating thoughtfully, and staying active — happens outside the clinic.

When CKD does progress, modern nephrology offers a range of options, from medical management to dialysis to transplant, and the decisions between them are shared ones, shaped by your medical situation, your priorities, and your life. Whatever stage you are at, ongoing partnership with a nephrology team gives the best chance of preserving kidney function, protecting your heart, and living well with chronic kidney disease.