Chronic Kidney Disease: A Complete Guide for Patients and Families

What kidneys actually do

Most descriptions stop at filtering waste, which undersells the job considerably. Kidneys also regulate blood pressure, control the balance of salt and water in the body, keep calcium and phosphate in the range bones need, activate vitamin D, and produce the hormone that tells bone marrow to make red blood cells.

This explains why kidney disease produces symptoms that seem unrelated to the kidneys. Anaemia, bone pain, itching, and blood pressure that suddenly becomes hard to control are all downstream of the same organ. It also explains why treatment involves more than one medicine: each addresses a different function that has been lost.

What chronic kidney disease means

The clinical definition has two parts, and both matter. Either kidney function is reduced — an eGFR below 60 — or there is evidence of kidney damage such as protein in the urine. Crucially, the abnormality must have been present for at least three months. A single abnormal result is not a diagnosis, which is why doctors repeat the test rather than acting on one report.

Chronic kidney disease is distinct from acute kidney injury, which is a sudden drop in function caused by something like severe dehydration, an infection, an obstruction, or a drug reaction. Acute injury often recovers when the cause is treated. The two are sometimes confused because the blood tests look similar in the moment.

The five stages, and what changes at each

Staging uses eGFR, which estimates how much blood the kidneys clear per minute. Higher is better.

Stage G4 is the stage families most often wish they had understood earlier. Preparation started here — being assessed for transplant, identifying a possible living donor, creating dialysis access — makes the transition far smoother than starting dialysis as an emergency.

Stage alone does not tell the whole story. Two people at G3b face different outlooks depending on how much albumin is in their urine. Ask for both numbers, not just the eGFR.

What causes it

In India, diabetes and high blood pressure together account for the large majority of chronic kidney disease. Both damage the small vessels the kidney depends on, and both do it silently over years.

• Diabetes — the single largest contributor, and the one most amenable to early intervention.
• High blood pressure — both a cause of kidney damage and a consequence of it.
• Glomerulonephritis — inflammation of the filtering units, often immune-driven.
• Polycystic kidney disease — inherited, so a family history matters.
• Repeated obstruction from stones, or an enlarged prostate.
• Long-term use of certain painkillers, particularly NSAIDs, and some unregulated preparations.

How it is found and monitored

Two inexpensive tests do most of the work: a blood creatinine reported as eGFR, and a urine albumin-to-creatinine ratio. Ultrasound is often added to look at kidney size and rule out obstruction. A biopsy is used when the cause is unclear and would change treatment.

Once diagnosed, the pattern of monitoring matters more than any single visit. Keeping reports in date order, so the trend is visible, is one of the most useful things a family can do.

What actually slows progression

This is where the most benefit is available, and where families have the most agency.

1. Blood pressure control — for many people, the highest-value single intervention.
2. Blood sugar control if you have diabetes, judged over months rather than by single readings.
3. Kidney-protective medication where prescribed. Several drug classes now have strong evidence behind them.
4. Reducing salt, which makes blood pressure easier to control.
5. Stopping tobacco in every form.
6. Avoiding regular NSAID painkillers, and checking any supplement or traditional preparation with your doctor first.
7. Treating infections and obstruction promptly rather than waiting.

No product marketed as flushing, cleansing, or reviving the kidneys has been shown to do so. Some herbal preparations contain substances that damage already-compromised kidneys. If you are taking something, say so at your appointment — doctors need to know, and will not judge you for asking.

Dialysis and transplant compared

Neither is a cure, and the choice is not a one-off decision — many people move between them over a lifetime. What follows is a general comparison; your own options depend on your health, your family situation, and what is available near you.

Read the detail on each: the dialysis page covers what a session is actually like and how home dialysis compares, and the transplant page covers eligibility, assessment, and where a kidney can legally come from in India.

What it costs, and what help exists

Cost is usually the first question families ask, and the answer is more encouraging than most people expect. Ayushman Bharat covers dialysis and, for eligible families, transplantation. Tamil Nadu operates its own state health insurance scheme alongside it. The national dialysis programme provides free dialysis in district hospitals for eligible patients.

The costs that catch families out are usually the recurring ones — immunosuppressant medication after a transplant, travel to sessions three times a week, and lost earnings for whoever accompanies the patient. Plan for those as deliberately as for the procedure itself. Our page on cost and schemes goes through each programme.

Living with it, and what to expect over time

Most people with chronic kidney disease never reach stage G5. Progression is not inevitable, and for many it is slow enough that other aspects of health matter more. Cardiovascular risk rises with kidney disease, so blood pressure and cholesterol are treated as part of kidney care rather than separately.

The practical burden tends to be underestimated. Appointments accumulate, medication lists grow, and one family member usually becomes the coordinator. Naming that person openly, and sharing the load deliberately, prevents the quiet exhaustion that often follows a year or two after diagnosis.

Depression and anxiety are common and treatable, in patients and in carers. Raising it is not a distraction from the kidney problem; it is part of managing it.

Questions worth taking to your next appointment

1. What is my eGFR, and what was it six and twelve months ago?
2. How much albumin is in my urine, and which category does that put me in?
3. What is the likely cause in my case?
4. What blood pressure and blood sugar targets should I be aiming for?
5. Do any of my current medicines need a dose change because of my kidney function?
6. At what point should we start discussing dialysis access or transplant assessment?
7. Which scheme am I eligible for, and who at this hospital helps with that paperwork?