Over 35 million adults in the United States have chronic kidney disease, and roughly 9 in 10 of them don’t know it. The condition develops silently, often without noticeable symptoms until significant damage has occurred. Understanding who faces the greatest risk is the most practical step toward catching it early, when treatment can slow or stop its progression.
Diabetes Is the Leading Risk Factor
About 1 in 3 people living with diabetes in the United States develop some degree of kidney disease. High blood sugar damages the tiny blood vessels inside the kidneys that filter waste from the blood. Over time, this damage causes scarring, and the kidneys gradually lose their ability to do their job. Both type 1 and type 2 diabetes carry this risk, though poorly controlled blood sugar accelerates the damage significantly.
High Blood Pressure and Heart Disease
High blood pressure is the second leading cause of kidney disease. The kidneys depend on a dense network of blood vessels to filter your blood, and sustained high pressure wears those vessels down. This reduces the kidneys’ filtering capacity over time. Keeping blood pressure below 140/90 mm Hg is a standard target for protecting kidney function, though your doctor may recommend a lower number depending on your situation.
Heart disease and kidney disease feed off each other in a pattern doctors call cardiorenal syndrome. When the heart can’t pump blood efficiently, less blood reaches the kidneys, and their filtering rate drops. An estimated 63% of people with chronic heart failure show signs of kidney disease ranging from moderate to severe. The relationship works both ways: failing kidneys cause fluid buildup that strains the heart further.
Obesity and Metabolic Syndrome
Carrying excess weight puts direct strain on the kidneys. In the United States, obesity accounts for an estimated 24% of kidney disease cases in men and 34% in women. The mechanism involves more than just the indirect effects of diabetes and high blood pressure that often accompany obesity. Excess body fat damages the lining of blood vessels throughout the body, including those in the kidneys. This triggers a process called hyperfiltration, where the kidneys’ filtering units are forced to work harder than normal. Over months or years, that overwork leads to scarring and a slow, progressive decline in kidney function.
Age-Related Decline in Kidney Function
Kidney function naturally decreases with age. In healthy adults without high blood pressure, the kidneys lose roughly 0.4 to 1.1 mL/min of filtering capacity per year. That’s a modest and manageable decline on its own, but it means older adults start from a lower baseline, leaving less room to absorb additional damage from other risk factors.
The interaction between aging and other conditions is where the real danger lies. People with high blood pressure can lose kidney function up to three times faster than those without it. When you layer diabetes, obesity, or heart disease on top of age-related decline, the cumulative effect can push someone into clinically significant kidney disease much sooner. This is why screening becomes especially important after age 60, even if you feel fine.
Race, Ethnicity, and Socioeconomic Factors
Black Americans face a 3.5 times greater risk of progressing from early-stage kidney disease to kidney failure compared to white Americans. This disparity has both biological and social roots. Certain genetic variants more common in people of African descent can affect how the kidneys handle stress and injury. At the same time, Black communities are disproportionately affected by the social conditions that drive kidney disease: lower access to healthcare, higher rates of uncontrolled high blood pressure, and greater exposure to neighborhood stressors like pollution and food insecurity. These environmental factors account for a significant portion of the elevated blood pressure risk in Black populations, which in turn drives kidney damage.
Hispanic and Native American populations also face elevated rates of kidney disease, largely driven by higher prevalence of diabetes and less access to early detection and treatment.
Family History and Inherited Conditions
If a parent, sibling, or child has kidney disease, your own risk goes up meaningfully. A large study tracking family clusters found that having a parent with kidney disease raises your risk by about 42%, while having an affected sibling raises it by 70%. These numbers reflect a mix of shared genetics and shared environment, since spouses of people with kidney disease also show a modest increase in risk.
Some kidney diseases are directly inherited. Polycystic kidney disease is the most common, causing fluid-filled cysts to grow in the kidneys and gradually crowd out healthy tissue. Rarer inherited conditions like Alport syndrome and Fabry disease also cause progressive kidney damage. If any of these run in your family, early and regular screening can catch problems before they become severe.
Medications That Strain the Kidneys
Over-the-counter pain relievers like ibuprofen and naproxen are a commonly overlooked risk. These drugs reduce blood flow to the kidneys as a side effect of how they work. Research has found a four-fold increase in the risk of acute kidney injury during the first month of regular use, and the risk rises with higher doses. Even people taking recommended doses have developed significant kidney problems, particularly if they were already mildly dehydrated or had other risk factors. Occasional use is generally safe for most people, but daily or near-daily use over weeks or months is where trouble starts.
Environmental and Occupational Exposures
Chronic exposure to heavy metals, particularly lead, cadmium, and mercury, can damage the kidneys over time. These metals accumulate in the body slowly, and even low-level environmental exposure is widespread in industrialized countries. Common sources include cigarette smoke (a major source of cadmium), contaminated crops and soil near old mining or industrial sites, certain seafood from polluted waters, and polluted air from fuel combustion. People who work in mining, manufacturing, battery production, or smelting face the highest occupational exposure, though the general population absorbs lower levels through food, water, and air.
Why Screening Matters if You’re at Risk
Only about 25% of adults with moderate to advanced kidney disease know they have it. The early stages produce no symptoms you’d notice, and by the time you feel something is wrong, a substantial amount of kidney function may already be gone. A simple blood test measuring your estimated glomerular filtration rate (eGFR) and a urine test checking for protein can identify kidney disease well before symptoms appear. If you have diabetes, high blood pressure, heart disease, obesity, a family history of kidney problems, or you’re over 60, regular screening gives you the best chance of catching the disease when it’s still treatable.