Kidney stones can absolutely cause a low glomerular filtration rate (GFR), and they do so through more than one mechanism. A stone lodged in the ureter blocks urine flow, and the resulting back-pressure on the kidney can sharply reduce its filtering capacity within hours. One study of patients in the midst of renal colic found a mean GFR of roughly 46 mL/min, well into the range clinicians flag as reduced, which climbed to about 61 mL/min after the stone passed. But the story extends beyond acute obstruction, because people who form stones repeatedly also face a higher long-term risk of chronic kidney disease.
How a Stone Blocks Filtration
Most kidney stones that cause trouble are not sitting quietly inside the kidney itself. They cause the sharpest drops in GFR when they migrate into the ureter, the narrow tube connecting the kidney to the bladder. A stone stuck there acts like a plug. Urine backs up, the kidney swells with fluid (a condition called hydronephrosis), and pressure inside the kidney rises. That elevated pressure works against the kidney’s ability to push fluid through its filtering units, so GFR falls on that side.
Research on patients experiencing renal colic confirms the relationship between the severity of hydronephrosis and the degree of GFR loss. Patients with more advanced swelling had significantly worse kidney function, and the worse the blockage, the lower the filtration rate.1Europe PMC. Evaluation of glomerular filtration rate decline in patients with renal colic When the stone eventually passes or is removed, pressure normalizes and GFR tends to bounce back, though how completely depends on how long the obstruction lasted and whether any permanent damage occurred.
One kidney being blocked does not always show up as a dramatically low GFR on a standard blood test. The opposite kidney compensates by ramping up its own workload. Animal studies have shown that when one ureter’s pressure is elevated, the contralateral kidney increases sodium excretion roughly twofold even without raising its own GFR.2Karger Publishers / CrossRef. Renal Function during Contralateral Arterial or Ureteral Obstruction This compensation can mask the damage on the obstructed side, especially if the other kidney is healthy. A person could have a badly compromised kidney and still see a blood creatinine level that looks only mildly elevated.
Bilateral Obstruction and Acute Kidney Injury
The scenario changes drastically when both sides are blocked at once. Bilateral ureteric stones are uncommon, but when they happen, neither kidney can compensate for the other. The result can be acute kidney injury severe enough to require emergency intervention. In one reported case, a 49-year-old man presented with vague abdominal pain and blood in his urine; blood work revealed stage 3 acute kidney injury, and imaging eventually showed obstructing stones in both ureters.3PubMed Central. Bilateral ureteric stones: an unusual cause of acute kidney injury Bilateral obstruction is also relevant for anyone who has a single functioning kidney, whether from birth, prior surgery, or disease. A single stone on the only working side mimics bilateral obstruction in effect.
The risk of acute kidney injury from stones rises further when infection is in the picture. Urinary tract infections combined with ureteral stones and hydronephrosis represent an especially dangerous combination. A study of patients hospitalized with urinary tract infections found that those who also had a ureteral stone with hydronephrosis faced a higher risk of acute kidney injury compared to those with infection alone.4Scientific Reports. Ureteral stone with hydronephrosis and urolithiasis alone are risk factors for acute kidney injury in patients with urinary tract infection Infected urine trapped behind a stone can damage kidney tissue quickly, and this combination is treated as a urological emergency.
Does GFR Recover After Stone Removal?
For many people, yes. Once the obstruction is relieved, the kidney often regains a significant portion of its lost function. In the renal colic study mentioned earlier, mean GFR rose from about 46 mL/min during active obstruction to about 61 mL/min three months after stone passage, and creatinine fell from roughly 1.93 to 1.59 mg/dL.1Europe PMC. Evaluation of glomerular filtration rate decline in patients with renal colic That is a meaningful improvement, though it still did not reach what most people would consider a normal GFR. The degree of recovery depends on factors like how long the stone was blocking the ureter, how severe the hydronephrosis was, and whether infection or scarring developed.
The general principle is that the sooner obstruction is relieved, the better the kidney’s chances of bouncing back. Prolonged blockage, typically measured in weeks rather than days, can cause irreversible damage to the kidney’s tubules and blood vessels. A review of the evidence on stone removal and kidney function concluded that clearing a stone improves function by eliminating obstruction and, when present, underlying infection.5PubMed Central. Impact of stone removal on renal function: a review But “improves” does not always mean “fully restores.” A kidney that has been obstructed for a long time may never return to its pre-stone baseline.
Kidney Stones as a Long-Term Risk Factor for Chronic Kidney Disease
The relationship between kidney stones and GFR is not limited to the hours or days when a stone is actively causing blockage. Population-level research has found that people who form kidney stones carry a higher long-term risk of developing chronic kidney disease compared to people who never have stones. A large study that followed stone formers for an average of about nine years found they were at increased risk for a clinical diagnosis of CKD, as well as for sustained elevations in creatinine and sustained reductions in GFR.6PubMed Central. Kidney stones and the risk for chronic kidney disease That study did note that the increased risk of end-stage kidney disease or death specifically from CKD was not statistically significant, so the elevated risk seems to live mostly in the mild-to-moderate range of kidney impairment rather than outright kidney failure for most people.
Still, the connection has been found consistently across multiple populations and study designs.7PubMed Central. Chronic kidney disease in kidney stone formers The mechanisms probably overlap. Repeated episodes of obstruction cause cumulative damage. The metabolic abnormalities that cause stones in the first place, like high urinary calcium or uric acid, can also injure kidney tissue independently of any physical blockage. And the surgical procedures used to remove stones can, in some cases, contribute their own small dose of injury.
Research tracking patients with recurrent stones alongside cardiovascular disease paints an even more concerning picture. In one study, a GFR decrease was recorded in about 41% of patients with recurrent stone disease, and the rate was even higher among those who also had chronic heart failure. Patients with the most severe combination of stone disease and cardiovascular problems saw a sharp decline in kidney filtration function within just a few years of follow-up.8Vestnik Urologii. Chronic kidney disease in patients with recurrent nephrolithiasis and concomitant damage to the cardiovascular system Conditions like high blood pressure and diabetes, which often travel with kidney stones, compound the damage.
Staghorn Stones and Large Stone Burden
Not all kidney stones are small enough to pass on their own. Staghorn calculi are large, branching stones that fill the kidney’s internal collecting system. They can sit inside the kidney for years, sometimes growing silently, and they pose a particular threat to long-term kidney function. Unlike a small stone that causes a brief episode of colic and then passes, a staghorn stone creates chronic obstruction, serves as a reservoir for recurrent infections, and slowly destroys functional kidney tissue from the inside.
The consequences of leaving staghorn stones untreated are severe. Conservative management (meaning no surgical removal) has been associated with roughly a 36% risk of developing significant kidney impairment over a 10-year period, along with a 28% mortality rate in that same timeframe.9PubMed Central. Management of staghorn renal stones Those numbers make staghorn stones one of the clearest examples of how kidney stones can lead directly to a persistently low GFR if they are not addressed.
How Stone Removal Procedures Themselves Affect GFR
Here is a complication that often surprises patients: the procedures used to treat kidney stones can temporarily lower GFR on their own. Percutaneous nephrolithotomy (PCNL), which involves making a puncture through the back into the kidney to remove large stones, causes a measurable short-term dip in kidney function. One study found that mean GFR dropped from about 91 mL/min before surgery to roughly 84 mL/min at 48 hours afterward.10PubMed Central. Mean Changes in Estimated Glomerular Filtration Rate in Patients Undergoing Percutaneous Nephrolithotomy Having Renal Stone Disease A separate study reported a similar pattern, with GFR falling from about 96 to about 87 mL/min postoperatively, and noted that patients who required multiple punctures during the procedure experienced a larger GFR decline than those who needed only one.11PubMed. Changes in renal volume post Percutaneous nephrolithotomy based on ultrasonography and its correlation with glomerular filtration rate (GFR)
The good news is that this dip appears to be largely temporary. Another study of tubeless PCNL tracked GFR through the immediate postoperative period and found it hit its lowest point around 48 hours after surgery, dropping from about 75 mL/min preoperatively to roughly 64 mL/min, before beginning to recover by the third postoperative day.12PubMed Central. Effect of tubeless percutaneous nephrolithotomy on early renal function: Does it deteriorate? Think of this as the kidney reacting to the physical trauma of the procedure and then healing. For most patients, the benefit of removing the stone outweighs the short-lived drop in function.
Shock wave lithotripsy (SWL), which uses focused sound waves from outside the body to break stones into passable fragments, presents a more nuanced picture. The shock waves cause vascular trauma to the kidney tissue, tearing small blood vessels and triggering inflammation. Animal studies and clinical observations have shown this acute damage can be severe in some cases and lead to scarring with a permanent loss of functional kidney volume.13PubMed Central. The acute and long-term adverse effects of shock wave lithotripsy However, longer-term clinical follow-up has generally been more reassuring. One study found that SWL did not significantly affect estimated GFR or blood pressure in the long run.14Nature Reviews Urology. No long-term effect of extracorporeal shockwave lithotripsy on renal function
Perhaps the most interesting finding comes from research on patients who already had chronic kidney disease before undergoing SWL. In these patients, GFR declined more slowly after successful stone removal by SWL than it had been declining before the procedure. In other words, clearing the stone appeared to slow down the progression of their existing kidney disease.15PubMed Central. Removal of Kidney Stones by Extracorporeal Shock Wave Lithotripsy Is Associated with Delayed Progression of Chronic Kidney Disease That same study also found that patients whose stones were not successfully cleared by SWL saw their GFR decline faster afterward, reinforcing the idea that the ongoing presence of a stone is what drives kidney function loss over time, not the treatment itself.
Uric Acid, Inflammation, and Kidney Damage Beyond Obstruction
Obstruction is the most obvious way a stone lowers GFR, but it is not the only one. Certain types of stones cause damage through chemical and inflammatory pathways that do not require a physical blockage at all. Uric acid stones are a good example. Elevated uric acid levels in the kidney can provoke damage that goes beyond simple crystal deposition. The process involves inflammation, changes to the small arteries feeding the kidney’s filtering units, and the eventual development of scarring in the tissue between the tubules.16PubMed. Renal Effects of Hyperuricemia Over time, these changes reduce the kidney’s functional capacity even if no single stone ever causes a dramatic episode of obstruction.
Calcium oxalate stones, the most common type, are also associated with tissue-level inflammation. Crystal deposits within the kidney parenchyma trigger immune responses that damage surrounding cells and can contribute to scarring. This is part of why recurrent stone formers face a higher long-term CKD risk even when their stones are small and tend to pass without causing obvious blockages.
Certain medications can also cause stone-related kidney damage. Drug-induced crystal formation inside the kidney’s tubules can provoke acute kidney failure even without producing a classic stone that shows up on imaging. Drugs that crystallize in concentrated urine can precipitate heavily within the tubules themselves, blocking them from the inside.17Drugs. Drug-Induced Kidney Stones and Crystalline Nephropathy: Pathophysiology, Prevention and Treatment Staying well hydrated is one of the simplest ways to reduce this risk, which is why high fluid intake is emphasized for anyone taking medications known to cause crystalluria.
Hereditary Stone Diseases That Threaten Kidney Function Early
For most adults, kidney stones are a nuisance that may gradually wear down kidney function over decades. But a subset of stone disorders, typically inherited, can cause serious kidney damage much earlier in life. Conditions like primary hyperoxaluria, cystinuria, and Dent disease produce abnormally high levels of stone-forming substances in the urine, leading to frequent stones and progressive CKD that can begin in childhood. Recurrent stone disease and nephrocalcinosis in young patients, especially before puberty, should raise suspicion for an inborn metabolic error as the underlying driver.18PubMed Central. Hereditary causes of kidney stones and chronic kidney disease
Primary hyperoxaluria is among the most severe of these. In its most aggressive form, the liver produces excessive amounts of oxalate, which floods the kidneys and forms dense deposits of calcium oxalate crystals throughout the kidney tissue. Without treatment, this can lead to kidney failure in childhood or early adulthood. Newer therapies, including RNA-based drugs that reduce oxalate production at its source, have changed the outlook for some of these patients, but the condition underscores how directly stone-forming chemistry can destroy kidney filtration capacity.
Cystinuria, caused by a defect in amino acid transport, leads to recurrent cystine stones that are often large and difficult to treat. Patients with cystinuria tend to undergo many stone removal procedures over their lifetimes, and the cumulative effect of both the stones and the surgeries contributes to gradual kidney function loss. For people with these hereditary conditions, the question is not really whether stones will affect GFR but how aggressively the decline can be slowed.
Kidney Stones During Pregnancy
Symptomatic kidney stones affect a small fraction of pregnancies but pose unique challenges. Normal pregnancy causes the ureters to dilate and urine flow to change, which can make stone diagnosis trickier and also alter how obstruction affects the kidney. Imaging options are limited because of radiation concerns, and many standard treatments are either riskier or unavailable during pregnancy.19Elsevier / Urology. Nephrolithiasis in Pregnancy: Treating for Two A stone causing significant obstruction in a pregnant patient needs to be managed carefully, because the same back-pressure dynamics that reduce GFR in any other patient apply here too, with the added complication that kidney function changes are already part of normal pregnancy physiology. Temporary drainage procedures like ureteral stent placement are often used to relieve obstruction until definitive stone treatment can be safely performed after delivery.
When to Worry About Your GFR if You Have Stones
A single small stone that passes within a day or two is unlikely to leave a lasting mark on your GFR. The concern grows with certain patterns. Recurrent stones over years, especially if they are large or require surgical removal, warrant periodic kidney function monitoring. A stone that causes prolonged obstruction, meaning you have symptoms for weeks or your imaging shows persistent hydronephrosis, is more likely to cause damage that does not fully reverse. Anyone who forms stones and also has diabetes, high blood pressure, or a family history of kidney disease should be especially attentive to their GFR trend over time, since these conditions compound one another.
If your GFR is low and you have a known stone, the first question your doctor will try to answer is whether the stone is actively obstructing. If it is, relieving the obstruction often produces a rapid improvement in GFR. If your GFR is low and imaging shows no current obstruction, the picture is more complex. Past episodes of obstruction, underlying metabolic abnormalities, or cumulative kidney tissue damage from years of stone disease could all be contributing. In either case, tracking GFR over time rather than reacting to a single measurement gives a much clearer picture of what the stones are actually doing to your kidneys.