Absolute Beginner

Your kidneys are two small organs inside your body. They clean your blood every day. When kidneys stop working well, doctors call it chronic kidney disease, or CKD.

A new report says 800 million people around the world have CKD. That is a very big number. It means about one in ten adults is affected. Many of them do not know they are sick.

Scientists say the number of sick people has doubled since 1990. That means twice as many people have CKD today. Doctors are worried because the disease is growing fast.

The good news is that healthy food and clean water can help keep kidneys strong. Doctors say people should get a simple blood or urine test to check their kidneys every year.

kidneys

two organs in your body that clean the blood

chronic

lasting for a long time; not going away quickly

disease

an illness that affects the body or mind

doubled

became two times bigger

affected

changed or harmed by something

blood

the red liquid that flows through your body

urine

the yellow liquid your body sends out as waste

test

a check that gives information about your health

Elementary

Chronic kidney disease, or CKD, is a condition in which the kidneys slowly lose their ability to filter waste from the blood. A major new study published in the medical journal The Lancet on May 29, 2026, reported that about 800 million adults worldwide now live with CKD. That number has doubled since 1990.

The study was led by scientists at the Institute for Health Metrics and Evaluation in the United States and NYU Grossman School of Medicine. They collected data from 195 countries. Their findings show that CKD is now one of the ten leading causes of death around the world, killing about 1.5 million people in 2023.

One serious problem is that CKD has almost no symptoms in its early stages. Most people feel fine until their kidneys are already badly damaged. By the time symptoms appear, treatment options are limited and expensive.

Doctors are calling for better screening programs so that the disease can be caught early. They also say that controlling blood pressure and blood sugar, drinking enough water, and avoiding certain painkillers can protect kidney health.

filter

to remove unwanted substances from a liquid

journal

a scientific magazine that publishes research papers

leading causes

the main reasons why people die or get sick

symptoms

signs of a disease, such as pain or fever

damaged

broken or harmed so it no longer works properly

screening

testing many people to find a disease early

blood pressure

the force of blood pushing against artery walls

painkillers

medicines that reduce pain

Intermediate

A landmark study published in The Lancet on May 29, 2026, revealed that chronic kidney disease now affects approximately 800 million adults globally -- a figure that has more than doubled since 1990. The research was co-led by the Institute for Health Metrics and Evaluation at the University of Washington and NYU Grossman School of Medicine, drawing on health data from 195 countries over three decades.

CKD, which describes the gradual and irreversible loss of kidney function, has entered the top ten causes of death worldwide. In 2023 alone it was responsible for around 1.5 million deaths. The disease is disproportionately concentrated in low- and middle-income countries, where access to dialysis and kidney transplants is severely limited. Sub-Saharan Africa, South Asia, and parts of Latin America account for the steepest increases.

A central challenge highlighted by the researchers is the disease's asymptomatic nature during its early and middle stages. Because the kidneys possess substantial reserve capacity, patients frequently experience no noticeable decline in well-being until at least 60 to 70 percent of kidney function is already lost. This delay means that many diagnoses arrive only when dialysis or transplantation is immediately necessary.

The study's authors are urging governments to integrate routine kidney function screening -- using simple creatinine and protein-in-urine tests -- into primary care. They also stress that tackling upstream risk factors such as hypertension, Type 2 diabetes, and widespread use of over-the-counter non-steroidal anti-inflammatory drugs could significantly slow the epidemic's trajectory.

landmark

highly significant; marking an important point in history

irreversible

impossible to undo or reverse

disproportionately

to a degree that is much larger or smaller than expected

dialysis

a medical process that filters blood when the kidneys cannot

asymptomatic

showing no signs or symptoms of a disease

reserve capacity

extra functional ability that allows an organ to cope with damage

creatinine

a waste chemical in the blood used to measure kidney function

trajectory

the path or course something takes over time

Advanced

A comprehensive meta-analysis published in The Lancet on May 29, 2026, by investigators from the Institute for Health Metrics and Evaluation at the University of Washington and NYU Grossman School of Medicine has quantified the staggering global burden of chronic kidney disease: approximately 800 million adults are currently affected, representing a 112 percent increase over the 1990 prevalence estimate of 378 million. The disease now accounts for roughly 1.5 million deaths annually, placing it firmly within the ten leading causes of mortality worldwide.

The analysis reveals a stark epidemiological divide. While CKD prevalence has stabilized in high-income nations where antihypertensive therapy, diabetic management, and nephrology infrastructure are well established, rates in low- and middle-income countries continue to climb. Projections suggest that absent systemic intervention, the global death toll could breach 2.4 million per year by 2040. Sub-Saharan Africa faces the most severe access gap: fewer than 2 percent of patients who require renal replacement therapy can actually obtain it.

A recurring theme in the literature that this study reinforces is diagnostic latency. The human kidney's extraordinary functional reserve means that glomerular filtration rate can fall to roughly 30 percent of normal before patients experience fatigue, edema, or nausea. This asymptomatic window, which can span a decade or more, allows the disease to advance silently through stages G1 to G3 on the KDIGO classification scale, often reaching G4 or G5 before clinical presentation. At that juncture, the window for nephroprotective pharmacological strategies -- RAAS inhibitors, SGLT2 inhibitors, novel endothelin antagonists -- has largely closed.

The study's policy prescriptions center on three pillars. First, universal integration of estimated glomerular filtration rate and urine albumin-to-creatinine ratio screening into routine primary-care checkups. Second, aggressive upstream management of hypertension and Type 2 diabetes, which together explain more than 60 percent of incident CKD cases. Third, pharmacovigilance reform targeting indiscriminate NSAID use and nephrotoxic herbal remedies. The authors argue that a coordinated international effort modeled on HIV and tuberculosis response frameworks is both medically justified and economically rational.

meta-analysis

a study that combines and analyzes data from multiple independent studies

epidemiological divide

a gap in disease rates between different populations or regions

nephrology

the branch of medicine focused on kidney diseases and function

glomerular filtration rate

a measure of how well the kidneys filter blood per minute

KDIGO

Kidney Disease: Improving Global Outcomes, the international guideline body for kidney disease

RAAS inhibitors

drugs that block the renin-angiotensin-aldosterone system to protect kidneys and lower blood pressure