Kidney Diseases Explained: Types, Symptoms, Causes, Diagnosis, Tests and Treatment Options

Kidney d​isease​​ ​often progresses quietly. Many people discover it during a routine blood test and not with symptoms alone. Global estimates suggest that chronic kidney disease affects nearly 10 percent of the adult population, and a large proportion of cases are detected in later stages.  

In India, the burden continues to rise alongside diabetes and high blood pressure. Understanding how kidneys function and how kidney disease develops ​can ​help​     ​ you recognise risk early and seek timely care. 

What Is Kidney Disease? 

Your kidneys filter waste, balance fluids, and regulate electrolytes in the blood. They also support blood pressure control and ​Haemoglobin​ ​production. When these functions decline over time or stop abruptly, waste products accumulate in the body.​ Similarly, other functions ​of the kidneys also start getting affected.​​ 

The term ​​Kidney disease refers to conditions that impair the kidneys' filtering ability. Some forms progress slowly over the years. Others develop within days due to infection, dehydration, or medication effects. In either situation, the body's internal balance shifts in subtle ways before symptoms become obvious. 

Types of Kidney Diseases 

Kidney conditions differ in onset, severity, and underlying cause. Let’s understand some of the most common kidney diseases: 

Chronic Kidney Disease 

Chronic kidney disease involves a gradual and irreversible decline in kidney function​, generally ​more than 3 months​​​     ​It is classified into five stages based on estimated glomerular filtration rate, known as eGFR. Early stages often pass unnoticed. Later stages show a measurable reduction in filtration capacity. 

Acute Kidney Injury 

Acute kidney injury refers to the sudden loss of kidney function. Severe infections, significant blood loss, dehydration, or certain drugs often trigger it. Prompt treatment sometimes restores function, though delayed care increases the risk of long-term damage. 

Glomerulonephritis 

This condition involves inflammation of the kidney’s filtering units, called glomeruli. It follows infections or develops due to immune system disorders. 

Polycystic Kidney Disease 

Polycystic kidney disease is an inherited condition. Fluid-filled cysts form within the kidneys and gradually impair function. 

Infections and Obstructions 

Recurrent urinary infections, kidney stones, or structural blockages also contribute to a disorder of kidney function if untreated. 

Symptoms of Kidney Disease 

Early stages often present no clear discomfort. As function declines, physical changes begin to surface. 

You might notice: 

• Swelling in the feet, ankles, or around the eyes due to fluid retention 
• Foamy or bubbly urine indicates protein leakage 
• Reduced or increased frequency of urination 
• Persistent fatigue or weakness 
• Dry and itchy skin 
• Nausea or reduced appetite 
• Muscle cramps 
• Shortness of breath in the advanced stages 

Many people attribute these signs to ageing or a minor kidney problem. Delayed evaluation leads to progression before diagnosis. 

Causes and Risk Factors 

Two conditions account for most long-term kidney damage, which are diabetes and high blood pressure. High blood sugar injures small blood vessels in the kidneys. Along with that, uncontrolled hypertension exerts pressure on delicate filtration units. 

Other contributing factors include: 

• Autoimmune disorders such as lupus 
• Long-term use of certain pain-relieving medicines 
• Recurrent kidney infections 
• Family history of kidney failure 
• Age above 60 years 
• Cardiovascular disease 

In the Indian population, the rising prevalence of diabetes has led to increasing cases of chronic kidney impairment. Early screening in high-risk groups improves detection. 

Stages of Chronic Kidney Disease 

Chronic kidney disease is divided into five stages according to eGFR values. 

Stages 1 and 2: Mild reduction in filtration. Structural abnormalities or protein in urine may appear, though symptoms are rare. 

Stage 3: Moderate decline in function. Fatigue and mild swelling ​may ​become more noticeable. 

Stage 4: Severe reduction in filtration. Complications such as anaemia and bone imbalance ​can start manife​sting.​​​     ​ 

Stage 5: Kidney failure and eGFR falls below 15. Dialysis or transplantation becomes necessary to sustain life. 

Diagnosis and Tests 

Kidney disorders are usually identified through routine investigations. 

Common diagnostic tools include: 

• Blood tests measuring creatinine levels and calculating eGFR. 
• Urine tests detect albumin or protein leakage. 
• Ultrasound imaging to assess kidney size and structure. 
• Kidney biopsy in selected cases to determine the exact cause. 

If you have diabetes or hypertension, annual screening helps detect changes before symptoms appear. If the findings are abnormal, then you must consult a nephrologist at your earliest convenience. 

Treatment Options 

Treatment depends on stage, underlying cause, and overall health status. 

Medical Management 

Controlling blood sugar and blood pressure forms the foundation of therapy. Doctors adjust medications to protect kidney function. Dietary changes, such as regulated salt and protein intake, also reduce strain on the kidneys. Treatment of anaemia or bone imbalance addresses related complications. Timely intervention slows the progression of kidney disease and reduces cardiovascular risk. 

Advanced Treatment 

In advanced stages, renal replacement therapy becomes necessary. 

Dialysis removes waste products and excess fluid from the blood through an external machine ​(Haemodialysis) ​or ​via the peritoneal membrane in the abdomen (Peritoneal dialysis)  ​​​​  ​ Kidney transplantation offers a long-term solution for eligible patients. Evaluation includes compatibility testing and overall health assessment. Care plans are unique for each patient and require regular monitoring. 

When to Seek Medical Attention 

You should consult a specialist if you experience persistent swelling, unexplained fatigue, or changes in urination. Individuals with long-standing diabetes, hypertension, or a family history of ​​kidney disease ​​​     ​must go for routine screening even if there are no symptoms. Early evaluation prevents complications that develop silently over the years. 

Conclusion 

Kidney diseases often come to notice only when significant damage has already occurred. Structured screening, accurate diagnosis, and stage-based management improve outcomes and reduce long-term complications.  

If you have risk factors or notice persistent symptoms, schedule a consultation with the nephrology specialists at Hinduja Hospital Mahim. With a comprehensive evaluation and personalised treatment plan, doctors can intervene and take action on time. 

FAQs For Kidney Diseases

How to avoid kidney disease? 

Reducing the risk of kidney disease starts with steady control of blood pressure and blood sugar levels. Follow a balanced diet with moderate salt intake and limit processed foods. Maintain a healthy body weight through regular physical activity. Stay adequately hydrated and avoid frequent, unsupervised use of painkillers.  

Can damaged kidneys be repaired? 

Recovery depends on the type and extent of damage. Acute kidney injury that develops suddenly may improve if treated early, and the underlying cause is corrected. Chronic kidney disease, which progresses over time, leads to permanent loss of kidney function. In such cases, treatment is focused on slowing the disease and not reversing the damage.