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Chronic Kidney Disease (CKD) Explained: Causes, Stages and Risks
What CKD is, why it happens, and why monitoring matters
A clear overview of causes, stages, reversal and complications.
Chronic kidney disease (CKD) means your kidneys are damaged and can't filter blood as well as they should. It usually develops slowly over time. Early stages often have no symptoms, but can sometimes be slowed or partially reversed with treatment. Advanced stages can lead to kidney failure, requiring dialysis or transplant.
What It Means
Your kidneys filter waste, balance fluids and help control blood pressure. In CKD, that filtering ability declines. Doctors track this mainly through blood tests (creatinine) and urine tests, then calculate an eGFR number to estimate how well your kidneys are working.
Why It Matters
Kidney damage often progresses silently. Catching it early gives you the best chance to slow or stop further decline through blood pressure control, blood sugar management, medication and lifestyle changes.
What Is Normal
An eGFR of 90 or above is generally considered normal for most adults. 60–89 may indicate mild loss if other signs are present. Below 60 for three months or more usually suggests CKD. Below 15 indicates kidney failure.
When To Pay Attention
Swelling in legs, fatigue, changes in urination, persistent itching, nausea or unexplained shortness of breath can be later signs. Early CKD often has no symptoms — which is why routine blood and urine tests are important, especially if you have diabetes, high blood pressure or a family history.
Common questions
What causes chronic kidney disease?
The two most common causes are diabetes and high blood pressure. Other causes include glomerulonephritis, polycystic kidney disease, repeated kidney infections, autoimmune diseases, certain medications (including long-term NSAID use), blockages and family history. Smoking, obesity and older age also raise risk.
What are the stages of CKD?
CKD is staged by eGFR and urine albumin. Stage 1 (eGFR 90+ with kidney damage markers), Stage 2 (eGFR 60–89 with damage markers), Stage 3 (eGFR 30–59), Stage 4 (eGFR 15–29), and Stage 5 (eGFR below 15, also called kidney failure or end-stage renal disease).
Can CKD be reversed?
Some causes of reduced kidney function can be partially reversed if caught early — for example, acute kidney injury from dehydration or a blockage may recover. Chronic damage from long-standing diabetes or high blood pressure usually cannot be reversed, but its progression can often be slowed significantly with treatment and lifestyle changes.
What can happen if CKD is not monitored or cared for?
Untreated or unmonitored CKD can progress to end-stage kidney failure, requiring dialysis or a kidney transplant. Along the way, it raises the risk of heart disease and stroke, anemia, bone disease, fluid buildup, electrolyte imbalances, nerve damage and reduced immunity.