Chronic Kidney Disease (CKD): Causes, Symptoms & Treatment Options

Chronic Kidney Disease  or CKD  is one of the most prevalent and underdiagnosed conditions in India today. It affects an estimated 800 million people worldwide, and in India alone, over 7.85 million individuals are believed to be living with some form of kidney failure. Yet it remains profoundly misunderstood: most patients don’t know they have it until significant, often irreversible damage has already been done.

CKD is not a single disease. It is a broad clinical syndrome  a progressive, long-term decline in the kidneys’ ability to filter blood, regulate fluid and mineral balance, and perform the dozens of other functions that keep the body in equilibrium. It unfolds slowly, across months or years, and its early stages are nearly always silent.

This guide provides a comprehensive, clinically accurate overview of CKD: what it is, what causes it, how it progresses through its stages, what symptoms to watch for, how it is diagnosed, and what the full spectrum of modern treatment options looks like  from lifestyle changes to dialysis to transplantation.

What Is Chronic Kidney Disease?

The kidneys are remarkable organs. Each one contains roughly one million microscopic filtration units called nephrons — each comprising a glomerulus (a tiny knot of capillaries where filtration occurs) and a tubule (which reabsorbs what the body needs and discards the rest). Together, both kidneys filter approximately 180 litres of blood per day, producing around 1.5 to 2 litres of urine.

In CKD, this filtration capacity progressively declines. Nephrons are damaged and lost over time — and unlike most cells in the body, they cannot regenerate. As nephron mass decreases, the remaining nephrons work harder to compensate, creating a vicious cycle of hyperfiltration stress that accelerates further loss.

The clinical measure of kidney filtration capacity is the estimated Glomerular Filtration Rate (eGFR) — derived from a blood creatinine measurement and adjusted for age, sex, and body size. An eGFR of 90 or above is considered normal. CKD is diagnosed when eGFR falls below 60 for three months or more, or when structural or functional kidney abnormalities (such as persistent proteinuria) are present at any eGFR level.

The 5 Stages of CKD

CKD staging is based on eGFR (estimated Glomerular Filtration Rate) measured in ml/min/1.73m². Stage and albuminuria category together determine overall CKD severity and prognosis.

Stage	Name	eGFR (ml/min)	Kidney Function	What Typically Happens
1	Normal + Damage	≥ 90	90–100%	Kidney damage present but function near-normal. Often no symptoms.
2	Mildly Reduced	60–89	60–89%	Slight reduction in function. Still largely asymptomatic. Monitoring begins.
3a/3b	Moderately Reduced	30–59	30–59%	Fatigue, mild anaemia, BP changes may begin. Key intervention window.
4	Severely Reduced	15–29	15–29%	Significant symptoms. Preparation for renal replacement therapy begins.
5	Kidney Failure	< 15	< 15%	End-stage renal disease (ESRD). Dialysis or transplant required.

 

What Causes Chronic Kidney Disease?

CKD has many causes, but in India — and particularly in Punjab — two conditions are responsible for the overwhelming majority of cases: diabetes mellitus and hypertension. Together they account for approximately 60–70% of all new CKD diagnoses nationwide.

1. Diabetes Mellitus (Diabetic Nephropathy)

Diabetes is the single leading cause of CKD globally. Chronic high blood glucose damages the glomeruli in multiple ways: it thickens the glomerular basement membrane, causes mesangial expansion, and triggers inflammatory and oxidative processes that progressively scar the filtration units. The result — diabetic nephropathy — typically develops over 10–20 years of poorly controlled diabetes and initially manifests as microalbuminuria (tiny amounts of protein in urine) before progressing to overt proteinuria, declining GFR, and eventually kidney failure.

2. Hypertension (Hypertensive Nephropathy)

High blood pressure is the second leading cause of CKD — and also its most common complication, since damaged kidneys lose their ability to regulate blood pressure, creating a destructive feedback loop. Chronic elevated pressure damages the renal arterioles, impairing blood flow to the glomeruli and causing ischaemic nephron loss and interstitial fibrosis.

3. Glomerulonephritis

Glomerulonephritis refers to a group of inflammatory conditions affecting the glomeruli — the filtration units. It may be primary (the kidney is the main target) or secondary to systemic diseases such as lupus (lupus nephritis), IgA nephropathy, or vasculitis. Many forms present with haematuria (blood in urine), proteinuria, hypertension, and declining GFR.

4. Polycystic Kidney Disease (PKD)

PKD is the most common hereditary kidney disease — an autosomal dominant condition in which multiple fluid-filled cysts progressively replace normal kidney tissue. It typically leads to kidney failure in the fifth or sixth decade of life and has no cure, though disease-modifying therapy (tolvaptan) can slow cyst growth in selected patients.

5. Recurrent Kidney Stones and Urinary Tract Infections

Chronic obstruction from recurrent stones, or repeated episodes of pyelonephritis (kidney infections), can cause progressive scarring and permanent nephron loss over time. This is more prevalent in regions like Punjab where dietary habits (high oxalate, high sodium) and dehydration in summer months contribute to stone formation.

6. Medications and Nephrotoxins

Chronic use of NSAIDs (ibuprofen, diclofenac), certain antibiotics (aminoglycosides), contrast agents, and some herbal or Ayurvedic preparations containing heavy metals or aristolochic acid are recognised causes of drug-induced CKD. This is an underrecognised but preventable cause that requires greater awareness in primary care.

7. Other Causes

• Renovascular disease (renal artery stenosis)
• Myeloma kidney (paraprotein deposition)
• HIV-associated nephropathy
• Obesity-related glomerulopathy
• Congenital and developmental kidney abnormalities

Read More :-7 Silent Signs of Kidney Disease Beyond Changes in Urine

Symptoms of Chronic Kidney Disease

CKD earns its reputation as a ‘silent disease’ because its early stages produce few or no symptoms. This is because the kidneys have enormous reserve capacity — function can fall to 30–40% of normal before the first symptoms emerge. By that point, the disease has typically been present for years.

The following table outlines the ten most clinically significant symptoms of CKD — how they feel, and the kidney mechanism behind each one:

Symptom	How It Feels	Kidney Mechanism
Fatigue & Weakness	Persistent exhaustion unrelated to activity	Anaemia from reduced EPO production; toxin build-up
Swelling (Oedema)	Puffy eyes, swollen ankles, tight fingers	Kidneys retaining excess fluid and sodium
Shortness of Breath	Breathlessness on mild exertion or at rest	Fluid in lungs (pulmonary oedema) or anaemia
Decreased Urine Output	Less urine than normal, or none	Falling GFR reducing filtration and excretion
Foamy/Frothy Urine	Persistent bubbles in urine	Protein leaking into urine (proteinuria)
Loss of Appetite / Nausea	Food aversion, metallic taste, morning nausea	Uraemia — urea and toxins accumulating in blood
Itching (Pruritus)	Whole-body itch with no visible rash, worse at night	Phosphate and uremic toxins depositing in skin
Muscle Cramps	Painful cramps, especially at night	Electrolyte imbalances — calcium, phosphate, potassium
Brain Fog	Poor memory, difficulty concentrating	Uraemic encephalopathy; reduced brain oxygenation
High Blood Pressure	BP resistant to medication	Kidneys failing to regulate fluid volume and renin

How Is CKD Diagnosed?

The diagnosis of CKD requires evidence of kidney damage or reduced kidney function persisting for more than 3 months. The core investigations are simple and inexpensive:

• Serum Creatinine + eGFR: A blood test measuring creatinine, from which eGFR is calculated. This is the primary measure of kidney filtration capacity and determines CKD stage.
• Urine Albumin-to-Creatinine Ratio (ACR): Detects protein leakage into urine — the earliest sign of glomerular damage. An ACR above 3 mg/mmol on two separate occasions confirms albuminuria.
• Urine Microscopy: Identifies red blood cells, white blood cells, and casts — providing clues to the underlying kidney disease type.
• Kidney Ultrasound: Assesses kidney size, structure, and echogenicity. Small, echogenic kidneys suggest chronic scarring; large kidneys may indicate PKD, infiltrative disease, or obstruction.
• Blood Tests Panel: Full blood count (for anaemia), electrolytes, bicarbonate (for acidosis), calcium, phosphate, parathyroid hormone (PTH), uric acid, and fasting glucose/HbA1c.
• Kidney Biopsy: Indicated when the underlying cause is unclear — particularly in glomerulonephritis, unexplained rapid decline, or when the diagnosis will change treatment. Performed under ultrasound guidance by a nephrologist.

Treatment Options for CKD

CKD has no single cure, but its progression can be significantly slowed — and in early stages, sometimes stabilised — with the right combination of treatments. The goals of CKD management are: (1) treat the underlying cause, (2) slow disease progression, (3) manage complications, and (4) prepare for renal replacement therapy if needed.

Treatment / Intervention	CKD Stage	How It Helps
Lifestyle Modification	All stages	Low-sodium diet, fluid control, exercise, smoking cessation, weight management
BP Control (ACE/ARBs)	All stages	ACE inhibitors or ARBs reduce intraglomerular pressure and slow CKD progression significantly
Blood Sugar Management	Diabetic CKD	Target HbA1c < 7%; SGLT2 inhibitors (empagliflozin, dapagliflozin) offer direct kidney protection
Anaemia Management	Stage 3+	Erythropoiesis-stimulating agents (ESAs), iron supplementation, EPO therapy
Phosphate Binders	Stage 3–5	Calcium carbonate, sevelamer — reduce phosphate absorption and prevent bone disease
Vitamin D & Calcium	Stage 3+	Activated Vitamin D (calcitriol) to prevent secondary hyperparathyroidism
Diuretics	Fluid overload	Remove excess fluid; thiazides (early CKD), loop diuretics (advanced CKD)
Hemodialysis	Stage 5 / ESRD	Blood filtered by machine 3x/week via vascular access (fistula/graft/catheter)
Peritoneal Dialysis	Stage 5 / ESRD	Home-based dialysis using the abdominal lining as a filter; more flexible lifestyle
Kidney Transplant	ESRD (selected patients)	Definitive treatment — best long-term outcomes; requires immunosuppression for life

Diet and Lifestyle in CKD Management

Dietary management is one of the most impactful — and most individualised — aspects of CKD care. The right dietary plan depends on the CKD stage, underlying cause, and the specific complications present. General principles include:

Sodium Restriction

Limiting sodium to under 2,300 mg per day (approximately 6g of table salt) reduces blood pressure, decreases fluid retention, and lowers the kidney’s filtration burden. In practice, this means avoiding pickles, papads, processed foods, and excess salt in cooking — all significant sources in the Punjabi diet.

Protein Management

In early-to-moderate CKD (Stages 1–3), protein intake is generally kept moderate (0.8g/kg/day) rather than restricted, to avoid malnutrition. In advanced CKD (Stages 4–5 not on dialysis), low-protein diets (0.6g/kg/day) have been shown to slow progression. Dialysis patients, however, require higher protein intake to compensate for dialysis-related losses. A renal dietitian should guide individual protein targets.

Potassium and Phosphorus

As kidney function declines, the ability to excrete potassium and phosphorus diminishes. High potassium (hyperkalaemia) can cause life-threatening cardiac arrhythmias; high phosphate drives secondary hyperparathyroidism and accelerates cardiovascular disease. Foods high in potassium (bananas, oranges, potatoes, tomatoes, coconut water) and phosphate (dairy, cola drinks, processed snacks) may need to be limited in Stages 3–5.

Fluid Intake

In early CKD, adequate hydration (2–3 litres daily) is protective. In advanced CKD and dialysis, fluid restriction is often essential. Patients must follow their nephrologist’s specific fluid target — not general hydration advice.

Renal Replacement Therapy: When the Kidneys Fail

When CKD reaches Stage 5 — End-Stage Renal Disease (ESRD) — the kidneys can no longer sustain life without external support. At this point, one of three renal replacement therapies is required:

Haemodialysis (HD)

The most common form of dialysis worldwide. Blood is drawn from the body through a vascular access (arteriovenous fistula, graft, or catheter), filtered through an artificial kidney (dialyser), and returned. HD is typically performed three times per week, each session lasting 3.5–4 hours, either in a dialysis centre or — increasingly — at home. It is effective but requires strict fluid and dietary discipline between sessions.

Peritoneal Dialysis (PD)

A home-based form of dialysis using the peritoneum (the lining of the abdominal cavity) as a natural filter. Dialysis fluid is infused into the abdomen via a permanent catheter, left for several hours to absorb waste products through the peritoneal membrane, and then drained. PD can be performed while sleeping (automated PD) or during the day (continuous ambulatory PD), offering greater lifestyle flexibility than HD.

Kidney Transplantation

A kidney transplant — from a living donor (preferred) or deceased donor — is the most effective treatment for ESRD, offering better survival, quality of life, and cost-effectiveness than dialysis over the long term. However, it requires careful patient selection, a compatible donor, major surgery, and lifelong immunosuppressive therapy to prevent rejection. Dr. Deepali Kaushal at Dhiman’s Gastro Clinics provides comprehensive pre-transplant evaluation and post-transplant follow-up care.

💡  A kidney transplant from a living related donor (parent, sibling, spouse) consistently produces the best outcomes — longer graft survival, shorter wait times, and better quality of life. Early referral for transplant evaluation is recommended for all eligible ESRD patients.

Preventing CKD — What You Can Do Today

The majority of CKD cases in India are preventable. The following measures, consistently applied from early adulthood, dramatically reduce lifetime kidney disease risk:

• Control diabetes: Maintain HbA1c below 7%. Use SGLT2 inhibitors if eligible — they have proven kidney-protective effects beyond glucose control.
• Control blood pressure: Target BP below 130/80 mmHg. Take medication consistently; never self-discontinue.
• Stay appropriately hydrated: 5–3 litres of fluid daily in normal conditions; more in Punjab’s summer heat. Pale straw-yellow urine is the target.
• Use NSAIDs carefully: Avoid routine self-prescribing of ibuprofen and diclofenac. Discuss all medications — including herbal supplements — with your doctor.
• Maintain a healthy weight: Obesity directly causes glomerulopathy and amplifies hypertension and diabetic kidney disease risk.
• Stop smoking: Smoking accelerates CKD progression by impairing renal blood flow and promoting proteinuria.
• Screen regularly: Annual kidney function tests (eGFR + ACR) for all high-risk individuals — the earlier abnormalities are caught, the more can be done.

About Dr. Deepali Kaushal

The clinical guidance throughout this blog reflects the expertise of Dr. Deepali Kaushal — one of Punjab’s most respected Consultants in Nephrology and Transplant Medicine, practising at Dhiman’s Gastro Clinics in Khanna, Punjab. Holding advanced qualifications in MD (Internal Medicine) and DM Nephrology, and with over 11 years of dedicated experience in kidney care, Dr. Kaushal offers comprehensive, evidence-based management for the full spectrum of kidney disease: Chronic Kidney Disease at all stages, Acute Kidney Injury (AKI), diabetic nephropathy, glomerular and autoimmune kidney disorders, lupus nephritis, IgA nephropathy, resistant hypertension, hemodialysis, peritoneal dialysis, CRRT, renal biopsy, vascular access management, and complete pre- and post-transplant care including immunosuppressive therapy monitoring.

✔️  Summary: Key Takeaways

• CKD is common and largely silent: It affects 1 in 7 adults and often produces no symptoms until 50–60% of kidney function is lost.
• Diabetes and hypertension are the leading causes: Both are largely controllable with lifestyle modification and medication.
• Five stages define CKD progression: eGFR is the key measurement — know yours if you are at risk.
• Symptoms span the whole body: Fatigue, swelling, itching, brain fog, and breathlessness are all potential kidney signals.
• Treatment is effective when started early: Lifestyle changes, targeted medications, and careful monitoring can significantly slow CKD progression.
• Dialysis and transplant are not the end: They are well-established, life-sustaining therapies with good outcomes when managed by an experienced nephrologist.
• Prevention is the best medicine: Most CKD can be prevented or significantly delayed with the right lifestyle choices and regular screening.

“Kidney disease is not a sentence. It is a signal — and the earlier you respond to that signal, the more your kidneys can be protected.”

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