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May 11, 2026· iHealth Network

Understanding Chronic Kidney Disease

Chronic kidney disease (CKD) affects approximately 37 million Americans — roughly 1 in 7 adults — yet 9 out of 10 people with CKD don't know they have it. It is a slow, largely silent condition that, left unmanaged, can lead to kidney failure, heart disease, and premature death.

Understanding Chronic Kidney Disease
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It is a slow, largely silent condition that, left unmanaged, can lead to kidney failure, heart disease, and premature death.</p>
<h2>The scale of the problem</h2>
<p>CKD is one of the most underdiagnosed chronic conditions in the US, despite its significant burden on long-term health and quality of life.</p>
<div class="stat-grid">
  <div class="stat-card"><span class="stat-num">37M</span><span class="stat-label">Americans living with chronic kidney disease</span></div>
  <div class="stat-card"><span class="stat-num">90%</span><span class="stat-label">Who have CKD but are unaware of their diagnosis</span></div>
  <div class="stat-card"><span class="stat-num">2x</span><span class="stat-label">Increased risk of heart disease in people with CKD</span></div>
  <div class="stat-card"><span class="stat-num">#9</span><span class="stat-label">CKD's rank among leading causes of death in the US</span></div>
</div>

<h2>What the kidneys do — and what happens when they don't</h2>
<p>Your kidneys are two fist-sized organs that work around the clock, filtering about 200 liters of blood every day. They remove waste products and excess fluids, regulate blood pressure, balance electrolytes like sodium and potassium, produce hormones that stimulate red blood cell production, and help keep bones healthy by activating vitamin D.</p>
<p>In chronic kidney disease, this filtration capacity declines gradually over months or years. As kidney function drops, waste products build up in the blood, fluid balance is disrupted, and the ripple effects spread through nearly every system in the body — the heart, bones, brain, and immune system are all affected.</p>
<p>CKD is defined by kidney damage or reduced function lasting three months or longer. It is not the same as acute kidney injury, which comes on suddenly and may be reversible. CKD, once established, is permanent — though its progression can often be significantly slowed.</p>

<h2>Causes and risk factors</h2>
<p>In most cases, CKD is a downstream consequence of other chronic conditions. The two most common causes together account for the majority of cases.</p>
<div class="risk-grid">
  <div class="risk-card"><i class="ti ti-droplet r-icon"></i><p class="r-title">Diabetes</p><p class="r-desc">The leading cause of CKD. High blood sugar damages the tiny blood vessels in the kidneys (diabetic nephropathy) over time, impairing their filtering ability.</p></div>
  <div class="risk-card"><i class="ti ti-heart r-icon"></i><p class="r-title">High blood pressure</p><p class="r-desc">The second leading cause. Uncontrolled hypertension damages the kidney's filtering units and the blood vessels that supply them.</p></div>
  <div class="risk-card"><i class="ti ti-dna r-icon"></i><p class="r-title">Genetics and family history</p><p class="r-desc">Polycystic kidney disease (PKD) is an inherited condition. A family history of kidney disease also raises personal risk meaningfully.</p></div>
  <div class="risk-card"><i class="ti ti-pill r-icon"></i><p class="r-title">Medications and toxins</p><p class="r-desc">Long-term use of NSAIDs (ibuprofen, naproxen), certain antibiotics, and contrast dyes used in imaging can damage kidney tissue.</p></div>
  <div class="risk-card"><i class="ti ti-virus r-icon"></i><p class="r-title">Glomerulonephritis</p><p class="r-desc">Inflammation of the kidney's filtering units, often triggered by autoimmune conditions like lupus or IgA nephropathy.</p></div>
  <div class="risk-card"><i class="ti ti-user r-icon"></i><p class="r-title">Age and demographics</p><p class="r-desc">Risk increases significantly after age 60. Black, Hispanic, and Native American adults are disproportionately affected due to higher rates of diabetes and hypertension.</p></div>
</div>

<h2>The five stages of CKD</h2>
<p>CKD is classified into five stages based on eGFR — estimated glomerular filtration rate — a measure of how well the kidneys are filtering waste from the blood. A normal eGFR is 90 or above. As eGFR declines, so does kidney function.</p>
<div class="stage-track">
  <div class="stage-block s1"><span class="sb-label">Stage 1</span><p class="sb-name">Normal+</p><p class="sb-gfr">eGFR &ge; 90</p></div>
  <div class="stage-block s2"><span class="sb-label">Stage 2</span><p class="sb-name">Mild loss</p><p class="sb-gfr">eGFR 60–89</p></div>
  <div class="stage-block s3"><span class="sb-label">Stage 3</span><p class="sb-name">Moderate</p><p class="sb-gfr">eGFR 30–59</p></div>
  <div class="stage-block s4"><span class="sb-label">Stage 4</span><p class="sb-name">Severe loss</p><p class="sb-gfr">eGFR 15–29</p></div>
  <div class="stage-block s5"><span class="sb-label">Stage 5</span><p class="sb-name">Kidney failure</p><p class="sb-gfr">eGFR &lt; 15</p></div>
</div>
<p class="stage-note">Stages 1–2 often have no symptoms. Most people first notice signs at stage 3 or later. Stage 5 requires dialysis or transplant to sustain life.</p>

<h2>Recognizing the symptoms</h2>
<p>CKD earns its reputation as a "silent disease" because early stages produce few or no symptoms. By the time symptoms appear, significant kidney damage has usually already occurred. Signs to watch for include:</p>
<ul class="symptom-grid">
  <li><i class="ti ti-moon"></i>Fatigue and weakness</li>
  <li><i class="ti ti-droplet"></i>Changes in urination frequency or color</li>
  <li><i class="ti ti-activity"></i>Swelling in legs, ankles, or feet</li>
  <li><i class="ti ti-brain"></i>Difficulty concentrating or brain fog</li>
  <li><i class="ti ti-stomach"></i>Nausea, vomiting, or poor appetite</li>
  <li><i class="ti ti-wind"></i>Shortness of breath</li>
  <li><i class="ti ti-ripple"></i>Persistent itching (pruritus)</li>
  <li><i class="ti ti-moon-stars"></i>Sleep problems and restless legs</li>
</ul>
<div class="callout callout-danger">
  <p class="callout-label"><i class="ti ti-alert-circle"></i> Seek care promptly</p>
  <p>Sudden swelling, difficulty breathing, extreme fatigue, or confusion can signal a serious worsening of kidney function or dangerous fluid and electrolyte imbalances. These require urgent medical evaluation.</p>
</div>
<div class="divider"></div>

<h2>How CKD is diagnosed</h2>
<p>Because CKD is so often asymptomatic in early stages, routine blood and urine testing is the only reliable way to catch it early. Two key tests form the foundation of diagnosis:</p>
<ul class="diag-list">
  <li><span class="diag-num"><i class="ti ti-flask" style="font-size:13px;"></i></span><div class="diag-content"><strong>eGFR blood test (creatinine)</strong><span>Creatinine is a waste product filtered by the kidneys. Elevated levels in the blood indicate reduced filtration. The eGFR is calculated from this result along with age, sex, and body size — and is the primary measure used to stage CKD.</span></div></li>
  <li><span class="diag-num"><i class="ti ti-droplet" style="font-size:13px;"></i></span><div class="diag-content"><strong>Urine albumin-to-creatinine ratio (UACR)</strong><span>Albumin is a protein that healthy kidneys keep in the blood. When kidneys are damaged, albumin leaks into the urine. A UACR above 30 mg/g on two separate tests is a key marker of kidney damage, even when eGFR is still normal.</span></div></li>
  <li><span class="diag-num"><i class="ti ti-scan" style="font-size:13px;"></i></span><div class="diag-content"><strong>Imaging</strong><span>Kidney ultrasound is commonly used to assess kidney size, structure, and check for cysts, stones, or blockages. CT scans may be used in specific circumstances.</span></div></li>
  <li><span class="diag-num"><i class="ti ti-microscope" style="font-size:13px;"></i></span><div class="diag-content"><strong>Kidney biopsy</strong><span>In cases where the cause is unclear or an inflammatory condition is suspected, a small tissue sample from the kidney can reveal the underlying cause and guide treatment.</span></div></li>
</ul>
<div class="callout callout-info">
  <p class="callout-label"><i class="ti ti-info-circle"></i> Who should be screened</p>
  <p>Annual CKD screening with eGFR and UACR is recommended for anyone with diabetes, high blood pressure, a family history of kidney disease, or age over 60. If you fall into any of these categories and haven't been tested recently, ask your doctor at your next visit.</p>
</div>

<h2>Treatment and management</h2>
<p>There is no cure for CKD, but there is a great deal that can be done to protect remaining kidney function, manage complications, and improve quality of life. Treatment is tailored to the stage of CKD and its underlying cause.</p>
<div class="tx-grid">
  <div class="tx-card"><i class="ti ti-heart"></i><p class="tx-title">Blood pressure control</p><p class="tx-desc">Keeping blood pressure below 130/80 mmHg is one of the most important steps. ACE inhibitors and ARBs are preferred — they protect kidney function beyond their blood pressure effects.</p></div>
  <div class="tx-card"><i class="ti ti-droplet"></i><p class="tx-title">Blood sugar management</p><p class="tx-desc">In diabetic CKD, tight glucose control slows kidney damage. SGLT2 inhibitors (like empagliflozin) have emerged as a major advance — they protect the kidney independent of blood sugar effects.</p></div>
  <div class="tx-card"><i class="ti ti-salad"></i><p class="tx-title">Kidney-friendly diet</p><p class="tx-desc">As CKD progresses, dietary adjustments become essential — limiting sodium, potassium, phosphorus, and protein helps reduce the kidney's workload and prevent dangerous electrolyte imbalances.</p></div>
  <div class="tx-card"><i class="ti ti-pill"></i><p class="tx-title">Medication review</p><p class="tx-desc">Many medications are processed by the kidneys or are toxic in higher doses for people with reduced function. A regular medication review with your doctor is essential to avoid compounding damage.</p></div>
  <div class="tx-card"><i class="ti ti-activity"></i><p class="tx-title">Anemia management</p><p class="tx-desc">Damaged kidneys produce less erythropoietin, leading to anemia. This is treated with erythropoiesis-stimulating agents (ESAs) and iron supplementation to maintain energy and quality of life.</p></div>
  <div class="tx-card"><i class="ti ti-bone"></i><p class="tx-title">Bone and mineral health</p><p class="tx-desc">CKD disrupts calcium, phosphorus, and parathyroid hormone balance, weakening bones. Phosphate binders, active vitamin D, and dietary changes help protect skeletal health.</p></div>
</div>

<h2>When kidneys fail: dialysis and transplant</h2>
<p>Stage 5 CKD — kidney failure — requires renal replacement therapy. At this point, the kidneys can no longer sustain life on their own.</p>
<p>Hemodialysis uses a machine to filter blood several times a week, typically in a clinic setting, though home hemodialysis is an option for some patients. Peritoneal dialysis uses the lining of the abdomen as a natural filter, allowing many people to manage treatment at home. Both are life-sustaining but carry significant lifestyle burden.</p>
<p>Kidney transplantation offers the best long-term outcomes — a successful transplant restores near-normal kidney function and dramatically improves survival and quality of life compared to dialysis. Planning for transplant, including getting listed early, should begin at stage 4.</p>
<div class="callout">
  <p class="callout-label"><i class="ti ti-heart"></i> Prevention starts with what you already know</p>
  <p>The most effective prevention strategies for CKD are the same as those for heart disease and diabetes: manage blood pressure and blood sugar, maintain a healthy weight, avoid smoking, limit alcohol, stay active, and use anti-inflammatory pain medications sparingly. If you have diabetes or hypertension, keeping those conditions well-controlled is the single most powerful thing you can do to protect your kidneys.</p>
</div>

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