Most bladder stones need to be physically removed, typically through a minimally invasive procedure called cystolitholapaxy, where a small scope is passed through the urethra to break the stone apart and extract the fragments. Unlike kidney stones, which sometimes pass on their own, bladder stones rarely resolve without treatment because they form in a pool of residual urine that keeps feeding their growth. Prevention hinges on addressing whatever caused the stone in the first place, whether that is an enlarged prostate, a catheter, or a neurological condition affecting bladder emptying.
Why Bladder Stones Form
Bladder stones are not simply kidney stones that traveled downstream. While a small kidney stone can occasionally migrate into the bladder and become the seed of a bladder stone, the vast majority form right inside the bladder itself. The central ingredient is urinary stasis: when the bladder does not empty completely, minerals in the leftover urine have time to crystallize and gradually accrete into a solid mass.1PubMed Central. Pathogenesis of Bladder Calculi in the Presence of Urinary Stasis Anything that creates a pool of residual urine raises the risk.
The most common culprit in adult men is benign prostatic hyperplasia (BPH), the gradual enlargement of the prostate that narrows the urethra and makes it harder to empty the bladder fully. Roughly 3% to 8% of bladder stones are traced directly to long-standing BPH.2PubMed Central. From Prostate Enlargement to Bladder Stone: Large Bladder Stone as a Complication of Long‐Standing BPH: A Case Study Older age and a weaker urinary stream are independent risk factors in men with prostate enlargement.3Urology. Intravesical Prostatic Protrusion Is a Risk Factor for Bladder Stone in Patients With Benign Prostatic Hyperplasia
In women, bladder stones are far less common, accounting for only about 5% of all cases. When they do occur, they tend to involve a foreign body such as a surgical suture, synthetic mesh, or a catheter, or they are linked to urinary stasis from other causes.4Obstetrical & Gynecological Survey. Urinary Bladder Stones in Women
People with spinal cord injuries face a particular challenge. Neurogenic bladder dysfunction disrupts the normal signals between the brain and the bladder, often leading to incomplete emptying, recurrent infections, and stone formation.5PubMed Central. Neurogenic bladder in spinal cord injury patients Among spinal cord injury patients using suprapubic catheters, about 11% develop bladder stones, compared to roughly 2% of those using intermittent catheterization.6Spinal Cord. Bladder stones in patients with spinal cord injury: a long-term study The type of bladder management matters enormously: indwelling catheters carry roughly ten to thirteen times the risk of stone formation compared to intermittent self-catheterization.7PubMed. Bladder management and risk of bladder stone formation in spinal cord injured patients
What Bladder Stones Are Made Of
Not all bladder stones share the same composition, and knowing what a stone is made of shapes both treatment and prevention. The most common type across all urinary stones is calcium oxalate, which accounts for roughly half of all analyzed specimens.8Microchemical Journal. Phase and microstructural study of urinary stones About a third are a mixture of calcium oxalate and hydroxyapatite (a calcium phosphate mineral), and smaller fractions are pure uric acid, cystine, or various combinations.9PubMed Central. The key role of major and trace elements in the formation of five common urinary stones
The composition matters because it determines whether a stone can be dissolved without surgery. Uric acid stones respond well to alkalinization therapy. Calcium-based stones do not. Any removed stone should be sent for laboratory analysis so that your urologist can tailor a prevention plan.
Surgical Options for Removal
For most adults with bladder stones, the standard treatment is transurethral cystolitholapaxy. A rigid or flexible scope is inserted through the urethra into the bladder, and the stone is broken up using mechanical force, ultrasound, pneumatic energy, or laser. The fragments are then suctioned or flushed out. The procedure is minimally invasive, requires a short hospital stay, and carries low complication rates.10PubMed Central. Transurethral cystolitholapaxy with the AH-1 stone removal system for the treatment of bladder stones of variable size When an enlarged prostate is also present, surgeons often perform a transurethral resection of the prostate at the same time, addressing both the stone and its underlying cause in a single session.
When stones are very large or the urethra is too narrow for a transurethral approach, percutaneous cystolitholapaxy offers an alternative. A small puncture is made through the lower abdomen directly into the bladder, and a scope is passed through that channel to fragment and remove the stone. One comparative study found that the percutaneous route had a shorter operating time than the transurethral approach for similar-sized stones, without significant differences in recovery or discharge times.11Nigerian Journal of Clinical Practice. Comparison of Three Techniques in Bladder Stone Surgery: Which Technique is more Effective and Safe?
Holmium laser lithotripsy is a third option, where laser energy pulverizes the stone into fine fragments. The same comparative study found that patients who had laser treatment reported less pain afterward. Laser lithotripsy also avoids the mechanical trauma of older crushing instruments, which can occasionally cause urethral stricture, a narrowing of the urethra from scar tissue.
Open surgery, where the bladder is opened through an abdominal incision, was once the only option and is now reserved for unusually large stones, cases where endoscopic access is not possible, or situations where another open procedure is already planned. Hospital stays after open cystolithotomy average several days longer than after endoscopic methods.12PubMed. Comparison of endourological and open cystolithotomy in the management of bladder stones in children Most surgeons view it as a last resort.
Dissolving Uric Acid Stones Without Surgery
Uric acid stones are the exception to the “bladder stones need surgery” rule. Because uric acid crystallizes in acidic urine and dissolves in alkaline urine, oral alkalinization therapy using potassium citrate or sodium bicarbonate can sometimes eliminate these stones entirely. A systematic review found that about 62% of patients with uric acid stones achieved complete dissolution, and another 20% had partial dissolution, giving an overall response rate above 80%.13PubMed. Selection and Outcomes for Dissolution Therapy in Uric Acid Stones: A Systematic Review of Literature
The process is not fast. One study tracking individual stones found that complete dissolution took an average of about 168 days, with half the stone volume disappearing over roughly 12 weeks.14Journal of Nephrology. Outcomes and rates of dissolution therapy for uric acid stones During treatment, urine pH is monitored regularly (usually with home test strips) and medication doses are adjusted to keep the pH in the target range, typically between 6.5 and 7.0. Stones that respond tend to belong to patients with lower uric acid levels in their urine and successfully elevated pH.
Dissolution therapy is safe and avoids the risks of anesthesia and instrumentation. But it only works for confirmed uric acid stones. If imaging or prior stone analysis suggests any significant calcium component, surgery remains the standard path. Some urologists use a trial of alkalinization as a diagnostic tool: if the stone shrinks on follow-up imaging, it confirms a uric acid composition.
Treating the Root Cause to Prevent Recurrence
Removing a bladder stone without addressing the reason it formed is an invitation for another one. If the underlying problem persists, recurrence rates are high. Prevention strategy depends almost entirely on what caused the stone in the first place.
For men with BPH, the question is whether conservative prostate management is enough or whether the prostate itself needs treatment. After endoscopic stone removal, men without a history of urinary retention, kidney damage, or severe obstruction can often be managed with medications such as alpha-blockers or 5-alpha-reductase inhibitors, without a high risk of the stone coming back.15Urology. Nonsurgical management of benign prostatic hyperplasia in men with bladder calculi For men with more severe obstruction, a prostate procedure at the time of stone removal makes recurrence much less likely.
For catheter-dependent patients, the type of bladder management is one of the strongest modifiable risk factors. Switching from an indwelling catheter to intermittent catheterization, when medically possible, dramatically lowers the annual risk of stone formation from roughly 4% down to about 0.2%.7PubMed. Bladder management and risk of bladder stone formation in spinal cord injured patients Of course, not every patient can make that switch, but when they can, the benefit is substantial.
The Catheter and Infection Connection
Long-term indwelling catheters create a unique pathway to bladder stones that deserves its own attention. The bacterium Proteus mirabilis is the main offender. It produces an enzyme called urease that splits urea into ammonia, driving up the urine’s pH. As the pH climbs, calcium and magnesium phosphates fall out of solution and crystallize both on the catheter surface and inside the bladder.16PubMed. Clinical complications of urinary catheters caused by crystalline biofilms: something needs to be done This crystalline biofilm encrusts and blocks the catheter, and the same crystal deposition seeds stone formation in the bladder.
Patients who become chronic “blockers,” meaning their catheters repeatedly crust over, almost invariably develop bladder stones. The bacteria embed themselves in a biofilm that antibiotics struggle to penetrate, so once the cycle is established, treating the infection alone is rarely enough.17Spinal Cord. The encrustation and blockage of long-term indwelling bladder catheters: a way forward in prevention and control Increasing fluid intake and adding citrated drinks can help slow crystal formation by keeping urine dilute and slightly more acidic, but the most effective prevention remains eliminating the indwelling catheter whenever feasible.
Early detection of Proteus mirabilis in catheterized patients, followed by targeted antibiotic treatment before a biofilm establishes, is one strategy that researchers have proposed. Once a thick crystalline biofilm is already in place, however, the bacteria within it are largely shielded from antibiotics, making eradication extremely difficult.
Fluid Intake and Dietary Changes
Drinking more water is the single most commonly recommended prevention measure for all types of urinary stones, and the evidence supports it, though the picture is more nuanced than “just drink more.” A Cochrane systematic review found that increasing water intake to achieve at least two liters of urine output per day cut stone recurrence by about 55% over five years compared to standard intake.18PubMed Central. Water for preventing urinary stones The evidence was rated as low certainty because it rested on a single well-designed trial, but the direction of benefit was clear.
A more recent randomized trial, however, added a wrinkle. A behavioral intervention that coached people to drink more fluids did modestly increase urine volume compared to standard guideline-based care, but it did not reduce symptomatic stone recurrences over a two-year follow-up.19The Lancet. Effect of a behavioural intervention programme on urinary stone recurrence: a randomised clinical trial One explanation is that the control group also increased their fluid intake after receiving standard guidelines, narrowing the gap between groups. Another is that two years may not be long enough to see the full benefit of fluid changes. Either way, the principle of keeping urine dilute remains sound. The debate is over how much additional coaching on top of basic advice actually changes outcomes.
Diet also plays a role, especially for people with recurrent calcium oxalate stones. A randomized trial found that a targeted dietary approach, tailored to a patient’s specific urinary chemistry, reduced calcium oxalate supersaturation by about 38%. The dietary changes included increasing fruits and vegetables, reducing sodium and oxalate-rich foods, and boosting water intake.20PubMed. Targeted versus empiric approach for prevention of recurrent kidney stones: Insights on diet therapy from a randomized trial Most of the dietary evidence focuses on kidney stones rather than bladder stones specifically, but since many of the same mineral dynamics apply, these strategies are commonly recommended for bladder stone prevention as well.
Bladder Stones in Children
In high-income countries, bladder stones in children are rare and usually signal an underlying anatomical or metabolic problem. In parts of the developing world, however, bladder stones in boys remain common, a condition historically called “endemic bladder stone disease.” The major contributing factor is a diet low in animal protein and high in oxalate-rich grains and vegetables.21PubMed. Endemic bladder calculi in children Unlike adult stones, these typically form without any urinary tract infection, obstruction, or foreign body.
Pediatric stone analysis in endemic areas shows a different compositional profile than in adults. Ammonium hydrogen urate stones, which are uncommon in well-nourished populations, make up a sizeable proportion of childhood bladder stones in affected regions. Low dietary potassium and low citrate in the urine are also frequently identified.22PubMed. Pediatric urolithiasis: developing nation perspectives Improving childhood nutrition in affected communities has historically been the most effective public health intervention for reducing endemic bladder stones.
Treatment in children follows the same principles as in adults but with greater attention to urethral size. Endoscopic approaches work well in older children, with hospital stays averaging about half the duration of open surgery.12PubMed. Comparison of endourological and open cystolithotomy in the management of bladder stones in children In very young children with small urethras, percutaneous access through the abdominal wall is often preferred over the transurethral route to avoid damaging the developing urethra.
What Happens If Bladder Stones Go Untreated
Left alone, bladder stones do not simply sit there quietly. They act as a constant source of irritation and infection. Chronic bladder inflammation from a stone can cause persistent pain, blood in the urine, and frequent urinary tract infections. Over time, the ongoing irritation to the bladder lining may increase the risk of bladder cancer. A large epidemiological study found that a history of bladder stones was associated with roughly 1.8 times the risk of bladder cancer, and recurrent urinary tract infections raised the risk even further, particularly for squamous cell carcinoma.23American Journal of Epidemiology. Urinary Tract Infection and Risk of Bladder Cancer
That does not mean every bladder stone leads to cancer. The vast majority do not. But chronic, untreated stones combined with recurrent infection create the kind of sustained inflammatory environment that can, over many years, promote abnormal cell changes. This is one of the reasons urologists urge removal rather than watchful waiting when a bladder stone is found, even if symptoms are mild.
Bladder Stones Are One of the Oldest Surgical Diseases
Removing bladder stones is among the oldest recorded surgical procedures in medicine. Hippocrates described the symptoms of bladder stones, and the Roman physician Celsus documented perineal lithotomy, a technique in which the surgeon cut through the perineum to extract the stone from the bladder.24PubMed Central. The history of urinary stones: in parallel with civilization That approach remained the standard for nearly two millennia, surviving largely unchanged until the late 1800s when anesthesia and antiseptic technique opened the door to safer surgical approaches.25PubMed Central. History of Renal Stone Surgery: A Narrative Review
In medieval Europe, the Fourth Lateran Council of 1215 actually forbade physicians from performing surgery, viewing contact with blood as contaminating. The procedure passed to specialized craftsmen called “lithotomists” who traveled from town to town. Samuel Pepys famously underwent lithotomy in 1658 and celebrated the anniversary of his survival every year afterward. The mortality rate from the procedure was staggering by modern standards. Today, transurethral cystolitholapaxy involves no external incision at all and is typically done as a day procedure. The contrast between ancient perineal cutting and a modern scope passed painlessly through the urethra under brief anesthesia illustrates how far surgical technique has come for what may be humanity’s oldest stone disease.