Kidney failure in young adults is uncommon but not rare, and its causes look different from those in older populations. While diabetes and high blood pressure account for roughly 75% of all kidney failure cases in the United States, younger people are more likely to develop kidney failure from autoimmune diseases, genetic conditions, and glomerular disorders that damage the kidney’s filtering units. Understanding these causes matters because many of them are treatable or manageable when caught early.
Glomerular Diseases
The kidneys filter blood through tiny clusters of blood vessels called glomeruli. When these become inflamed or scarred, protein and blood leak into the urine and the kidneys gradually lose function. Glomerular diseases are among the most common causes of kidney failure in young adults.
IgA nephropathy is one of the most frequently diagnosed glomerular diseases in young adults. It occurs when an abnormal form of an immune protein deposits in the glomeruli, triggering inflammation. Many people with IgA nephropathy have no symptoms for years, only discovering the condition when a routine urine test picks up blood or protein. Progression varies widely, but a meaningful subset of young adults with the condition do advance to kidney failure, sometimes within a few years of diagnosis.
Focal segmental glomerulosclerosis (FSGS) is another major cause. In FSGS, segments of the glomeruli develop scar tissue, which progressively reduces the kidney’s filtering capacity. It can arise on its own, from genetic mutations, or as a secondary effect of obesity, infections, or drug use. FSGS often presents with significant protein loss in the urine and can progress aggressively in younger patients.
Lupus and Autoimmune Kidney Disease
Systemic lupus erythematosus is a chronic autoimmune disease that predominantly affects women of childbearing age. About 50% of people with lupus develop lupus nephritis, a form of kidney inflammation that is the most common (though not the only) way lupus damages the kidneys. Notably, people with lupus who develop kidney involvement tend to present at a younger age than those whose lupus spares the kidneys.
The risk isn’t evenly distributed. Black and Hispanic patients tend to have more severe underlying kidney damage, higher markers of impaired kidney function, and greater protein loss in the urine at the time of diagnosis compared to white patients. Certain autoantibodies linked to kidney involvement are also more frequently positive in Black patients. These disparities mean that some young adults face a substantially higher risk of lupus-related kidney failure than others, making early screening in high-risk groups especially important.
Genetic Conditions That Affect the Kidneys
Some young adults develop kidney failure because of conditions they were born with. Two inherited diseases stand out.
Autosomal dominant polycystic kidney disease (ADPKD) causes fluid-filled cysts to grow throughout both kidneys, gradually replacing healthy tissue. It’s one of the most common inherited diseases overall, affecting roughly 1 in 400 to 1,000 people. ADPKD comes in two genetic forms. People with the more common mutation (PKD1) reach kidney failure at an average age of about 55, while those with the less common form (PKD2) typically don’t reach that point until around age 74. Fewer than 2% of people with ADPKD need dialysis before age 40, but the disease is already silently enlarging the kidneys and reducing function well before that. Genetic testing is sometimes used for young adults with a family history and inconclusive imaging, particularly if they’re considering becoming a kidney donor or planning a family.
Alport syndrome is a rarer inherited condition that affects the structural proteins in the kidney’s filtering membranes, as well as in the ears and eyes. Earlier descriptions of the disease suggested that affected males would reach kidney failure in their teens or early twenties, but more recent research has revealed a wider range. Many individuals don’t develop kidney failure or deafness until age 40 to 60, depending on the specific genetic mutation. Still, Alport syndrome carries a significant lifetime risk of kidney failure, along with hearing loss and vision abnormalities.
High Blood Pressure Starting in Adolescence
High blood pressure is the second leading cause of kidney failure overall, and new research shows the damage can begin much earlier than most people realize. A large study published in the American Heart Association’s journal Hypertension tracked adolescents into young adulthood and found that blood pressure at or above 130/80 was associated with early kidney damage, with effects appearing before age 30.
The risk was especially pronounced in adolescents who also carried excess weight. Teens with a BMI at or above the 85th percentile and blood pressure of 130/80 or higher had about a 50% greater risk of early kidney damage compared to the reference group. At blood pressures of 140/90 or higher, the risk climbed to nearly 80% greater for those with elevated BMI. Even lean adolescents with blood pressure in that range had a meaningfully increased risk. The study’s survival analysis showed that among those with higher BMI, the divergence in kidney health between blood pressure groups became evident by roughly age 30.
This matters because high blood pressure in teens and young adults often goes undiagnosed. It rarely causes symptoms, and many young people don’t get regular checkups. Years of silently elevated pressure can scar the small blood vessels in the kidneys, gradually eroding their function.
Painkillers, Supplements, and Substance Use
Common over-the-counter painkillers, particularly nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen and naproxen, can damage the kidneys when used heavily. While the overall rate of kidney toxicity from NSAIDs is estimated at 1% to 5%, their widespread use means a large number of people are affected in absolute terms. Taking seven or more standard daily doses per month has been linked to increased risks of both sudden kidney injury and chronic kidney disease.
NSAIDs can harm the kidneys in two main ways. They reduce blood flow to the kidneys by blocking protective chemical signals, which can cause acute injury, especially during dehydration or intense exercise. They can also trigger a delayed immune reaction in the kidney tissue called interstitial nephritis, which typically develops days after starting the medication but usually resolves once the drug is stopped. Young athletes and people managing chronic pain are particularly vulnerable because they may use these drugs frequently without realizing the cumulative risk.
Anabolic steroids pose a more severe threat. Research from Columbia University found that bodybuilders using anabolic steroids developed FSGS, the same scarring disease that arises from other causes. The mechanism appears to be twofold: extreme gains in muscle mass force the kidneys to dramatically increase their filtering workload, and the steroids themselves appear to have direct toxic effects on the glomeruli. Because kidney cells carry receptors for these hormones, the damage is more severe than what’s seen even in people with much higher body mass from obesity alone. Massive protein supplement intake compounds the problem by further increasing the kidneys’ filtration burden. While this is a normal short-term adaptation, chronic hyperfiltration from sustained high-protein diets can accelerate scarring.
Diabetes in Younger Populations
Diabetes remains the single largest cause of kidney failure across all age groups, responsible for 45% of new cases in the U.S. between 2018 and 2023. While type 2 diabetes has traditionally been viewed as a disease of middle and older age, rising obesity rates have pushed its onset earlier. Young adults diagnosed with type 2 diabetes in their twenties face decades of exposure to high blood sugar, which damages the kidneys’ delicate filtering structures over time.
Type 1 diabetes, which typically begins in childhood or adolescence, also carries substantial kidney risk. After 15 to 20 years of disease, a meaningful percentage of people with type 1 diabetes develop significant kidney impairment. Because the clock starts early, kidney failure can arrive in the thirties or forties. Tight blood sugar control and blood pressure management are the most effective tools for slowing this progression.
Why Early Detection Matters
Many of these conditions share a common feature: they progress silently. Kidney function can drop to 20% or 30% of normal before a person feels sick. Simple screening tests, a urine test for protein and a blood test for kidney function, can catch damage years before symptoms appear. For young adults with risk factors like a family history of kidney disease, lupus, diabetes, obesity, or long-term NSAID use, these inexpensive tests can be the difference between early treatment and irreversible damage.