A kidney stone can absolutely get stuck in the urethra, and when it does, the situation tends to be painful and sometimes urgent. The urethra is the final stretch of the urinary tract, the tube that carries urine from the bladder out of the body, and it contains some of the narrowest passages a stone has to navigate. Stones that pass through the kidney and ureter without trouble can lodge here and refuse to budge. The medical term for this is an “impacted urethral stone,” and while it is less commonly discussed than stones stuck in the ureter, it happens often enough that urologists deal with it regularly.
Why the Urethra Is a Chokepoint
Most of the attention around kidney stones focuses on the ureter, the long tube connecting the kidney to the bladder, because that is where stones most frequently cause obstruction. But once a stone reaches the bladder, it still has to exit through the urethra, and the urethra has its own set of bottlenecks. In men, the urethra is roughly 18 to 20 centimeters long and passes through the prostate gland, the pelvic floor muscles, and the length of the penis before reaching the external opening. Several points along that route are narrower than others, particularly the prostatic urethra, the membranous urethra where it passes through the pelvic floor, and the meatus, the small opening at the tip. Any of these can trap a stone.
In women, the urethra is much shorter, typically around 4 centimeters, and straighter. This means stones pass through more easily, and impacted urethral stones in women are genuinely rare. Case reports describe them, but they are far less common than in men because of that anatomical difference.1African Journal of Urology. An impacted urethral stone: a rare cause of acute urinary retention in women—case report A stone that would sail through a shorter, wider female urethra can get wedged at a narrow point in a male urethra and cause a real problem.
Size matters, but not always in a straightforward way. A stone under 5 millimeters will usually pass through the urethra on its own. Stones between 5 and 10 millimeters have a harder time. And stones larger than a centimeter can become firmly impacted and may not move without medical help. Shape and surface texture play a role too. A smooth, rounded stone slides more easily than a jagged, irregular one that can catch on the urethral lining.
What It Feels Like When a Stone Is Stuck
The hallmark symptom of a urethral stone is difficulty urinating, or in more severe cases, complete inability to urinate. When a stone blocks the urethra, urine backs up behind it. This leads to a distended, painful bladder and a feeling of desperate urgency with no relief. In men, the pain is often localized to the penis or perineum, the area between the scrotum and the anus. If the stone is near the tip, you might actually be able to feel it or see a bulge at the meatus.
Other common symptoms include a weak or interrupted urine stream, blood in the urine, burning during urination, and sometimes a visible discharge if infection has set in. In children, the presentation can be slightly different. A case report described a seven-year-old boy who arrived at the emergency department with urinary retention that was initially thought to be caused by a urinary tract infection; doctors could not even pass a catheter past the stone.2PubMed Central. Impacted urethral stone presenting as urinary retention in a child Children with urethral stones should be considered in cases of unexplained urinary retention, blood in the urine, or abdominal pain, even though the diagnosis is uncommon at that age.
Not every impacted stone causes complete blockage. Some stones partially obstruct the urethra, allowing urine to trickle around them. In these cases the symptoms are subtler: a chronically weak stream, frequent urination, or recurrent urinary tract infections. One case report documented a patient with a massive, long-standing urethral stone measuring 4 by 2 centimeters who somehow never experienced complete urinary retention, though the stone had caused significant kidney swelling from the chronic partial obstruction.3PubMed Central. Giant long-standing urethral calculus without urinary retention: A case report That is an extreme case, but it illustrates that some people adapt to a gradually worsening blockage and delay seeking care until serious damage has occurred.
How Urethral Stones Are Found
If a stone is lodged near the tip of the urethra, diagnosis can be as simple as a physical exam. Doctors can sometimes see or feel the stone directly. When the stone is deeper, imaging is needed. A standard X-ray of the pelvis can often reveal a stone, since most kidney stones contain enough calcium to show up on plain film. CT scans are the gold standard for finding stones anywhere in the urinary tract, including the urethra.
Bedside ultrasound, sometimes called point-of-care ultrasound, has become increasingly useful in emergency settings. It can identify where a stone is sitting in the urethra, estimate its size, and check for signs that urine is backing up into the bladder or kidneys.4PubMed Central. POCUS to Diagnose a Large Urethral Stone Causing Urinary Retention: A Case Report This is especially helpful because it can be done quickly at the bedside without radiation, which matters in children and pregnant women. It does not replace CT for complex cases, but it can confirm a suspected urethral stone fast enough to guide immediate treatment.
Getting the Stone Out
Treatment depends on where the stone is stuck, how large it is, and whether it is causing complete or partial obstruction. The options span a wide range, from something as straightforward as pulling the stone out with forceps to full surgical procedures under general anesthesia.
Stones at the Tip
When a stone is lodged right at the meatus, the external opening of the urethra, extraction can sometimes be remarkably simple. In one reported pediatric case, a 10-millimeter stone sitting at the meatus of a five-year-old boy was removed by simple extraction under local anesthesia, without any incision at all.5International Surgery Journal. Pediatric acute urinary retention due to impacted urethral meatal calculus: a rare case report When the stone is slightly too large for that approach, a meatotomy, a small incision to widen the urethral opening, allows it to be grabbed with forceps. This can be done under local anesthesia with a nerve block and provides immediate relief.6PubMed Central. Large urethral meatal stone: rare cause of acute urinary retention managed with meatotomy and stone retrieval
Stones Deeper in the Urethra
Stones lodged farther back, particularly in the posterior urethra near the prostate or in the membranous urethra, are trickier. The traditional approaches include using a scope to push the stone back into the bladder, where it can be broken apart and removed more safely, or making a surgical incision over the stone’s location to remove it directly. This second approach, called urethrolithotomy, involves cutting through the skin and urethral wall to extract the stone, and is typically used for larger or firmly impacted stones.7PubMed Central. Transrectal ultrasound-guided extraction of impacted prostatic urethral calculi: a simple alternative to endoscopy
In severe cases where the patient cannot urinate at all and the stone cannot be immediately removed, the first priority is relieving the backed-up urine. This sometimes means placing a suprapubic catheter, a tube inserted through the lower abdominal wall directly into the bladder, bypassing the blocked urethra entirely. In one case involving a four-year-old boy with complete urinary retention from a urethral stone, doctors drained 400 milliliters of urine through a suprapubic puncture before addressing the stone itself.8PubMed Central. Acute Urinary Retention Secondary to Urethral Lithiasis in a 4-Year-Old Boy: How We Managed This Rare Case That is a significant volume for a small child and illustrates how much urine can accumulate when the exit is completely blocked.
Giant or Complicated Stones
Rarely, urethral stones grow to extraordinary sizes, particularly when patients delay treatment for months or years. A case involving a giant anterior urethral stone that had caused bilateral kidney swelling required emergency cystostomy to relieve the retention, followed by a combination of open surgery through the perineum and endoscopic removal of additional bladder stones that had formed behind the obstruction.9Journal of Clinical Case Studies Reviews & Reports. Giant Anterior Urethral Stone Complicated by Acute Urinary Retention and Bilateral Hydronephrosis: A Rare Case Report and Management Approach Cases like these are preventable, and they underscore why urinary symptoms should not be ignored for extended periods.
What Happens When a Urethral Stone Is Ignored
A stone stuck in the urethra is not just uncomfortable; left in place, it can cause escalating damage. The most immediate risk is urinary retention, which if sustained can cause the bladder to overdistend and eventually lose its ability to contract properly. Behind the bladder, urine can back up into the ureters and kidneys, causing hydronephrosis, a swelling of the kidney that, if it persists, leads to permanent kidney damage.
Chronic irritation and infection around an impacted stone can erode the urethral wall, leading to urethral stricture, a narrowing of the urethra from scar tissue that can cause long-term urinary problems even after the stone is removed.10PubMed Central. Management of neglected urethral stone and Fournier’s gangrene as its complication: A case report In the worst scenarios, infection from a neglected stone can spread to the surrounding soft tissues, causing an aggressive, life-threatening infection called Fournier’s gangrene. That same case report described a patient with a long-neglected urethral stone who developed pus discharge from the urethra and ultimately required treatment for both the stone and the gangrenous tissue. These extreme outcomes are rare and occur mainly when people avoid medical care for prolonged periods, but they represent the far end of what can happen.
Even short of these dramatic complications, a urethral stone that partially obstructs flow for weeks or months sets the stage for recurrent urinary tract infections, bladder wall thickening, and the formation of additional stones behind the original blockage. The longer a stone sits, the more it tends to accumulate mineral deposits and grow, making eventual removal more difficult and more likely to require a bigger procedure.
Stones That Form Inside the Urethra
Most urethral stones are “secondary,” meaning they originated in the kidney or bladder and migrated into the urethra during urination. But a smaller category of urethral stones actually form in place. These “primary” urethral stones develop when conditions in the urethra itself promote mineral accumulation, and the most common culprit is a urethral diverticulum, an abnormal outpouching of the urethral wall.
Diverticula create pockets where urine pools and stagnates instead of flowing through. Over time, stagnant urine becomes a breeding ground for infection and mineral crystallization, and stones can grow within the pouch itself.11PubMed Central. Heineke-Mikulicz Principle in a Male With Failed Recurrent Urethral Diverticulum Some people are born with urethral diverticula, while others develop them after surgery or trauma to the urethra. One recognized pathway is prior hypospadias repair, a surgery performed in childhood to correct the position of the urethral opening. Long-term complications from that surgery can include the formation of diverticula, which then predispose the patient to stone formation, incomplete emptying, and recurrent infections.12PubMed Central. Urethral diverticulum with stone formation in an adult male after hypospadias repair: A case presentation
In women, urethral diverticula are a well-recognized clinical entity, often presenting with recurrent urinary tract infections, pain during intercourse, and a palpable mass near the urethral opening. Stone formation within female urethral diverticula occurs and can complicate diagnosis, since the symptoms mimic other conditions. The point is that not every urethral stone starts as a kidney stone. Some grow locally, and identifying the underlying cause matters because a diverticulum that is not addressed will keep producing stones.
Urethral Stones in Children
Kidney stones in children are less common than in adults, and urethral stones in children are rarer still. One estimate puts urethral calculi at less than one percent of all pediatric urinary stones.13PubMed Central. Urinary obstruction caused by urethral stones in a pediatric patient with hypospadias: a rare Case Report in Somalia But “rare” does not mean “does not happen,” and the challenge in children is that the diagnosis is often delayed because neither parents nor emergency department staff are thinking about urethral stones in a young child.
Children with urethral stones present similarly to adults: they complain of pain, they cannot urinate or can only urinate in a weak trickle, and they may have blood in their urine. Younger children who cannot articulate their symptoms may just appear distressed and inconsolable, with a visibly distended lower abdomen. In at least one case, the presenting concern was thought to be a urinary tract infection until imaging revealed the real cause.2PubMed Central. Impacted urethral stone presenting as urinary retention in a child
Children with congenital urinary tract anomalies, including hypospadias and posterior urethral valves, face a higher risk. Anatomical irregularities in the urethra can promote urine stasis and create conditions favorable for stone formation, even at young ages.13PubMed Central. Urinary obstruction caused by urethral stones in a pediatric patient with hypospadias: a rare Case Report in Somalia Behavioral factors also contribute. One case report noted that the child had a habit of delaying urination and low fluid intake, both of which increase stone risk.5International Surgery Journal. Pediatric acute urinary retention due to impacted urethral meatal calculus: a rare case report Encouraging children to drink water regularly and not hold their urine is basic but relevant prevention advice.
Why Some Stones Pass and Others Get Stuck
If you have ever passed a kidney stone before, you know the relief when it finally drops into the toilet. Many people assume that once a stone reaches the bladder, the hard part is over. For most small stones, that is true. The bladder is a large reservoir, and during urination the detrusor muscle generates enough pressure to push small stones through the urethra along with the urine stream. Stones under about 5 millimeters usually make it through without incident.
The stones that get stuck tend to share certain characteristics. They are larger, often in the 8 to 15 millimeter range by the time they cause trouble. They may have irregular or spiky surfaces that dig into the urethral lining and resist being propelled forward. And they tend to lodge at anatomical transition points, the places where the urethra changes diameter or passes through muscular structures. In men, the most common sites of impaction are the prostatic urethra, the external sphincter area, and the fossa navicularis near the tip of the penis. The meatus itself is the narrowest fixed point in the male urethra, which is why stones that have made it through everything else can get stuck right at the exit.
Underlying urethral conditions also play a role. A man with benign prostatic enlargement has a compressed prostatic urethra, creating a tighter passage. Someone with a prior urethral stricture from injury or infection has a narrowed segment that can trap even a modestly sized stone. And as discussed, urethral diverticula can catch stones in their pouches. The combination of stone size, stone shape, urethral anatomy, and underlying conditions determines whether a stone passes cleanly or becomes impacted.
Preventing a Recurrence After Removal
Getting a stuck urethral stone removed solves the immediate problem, but it does not address whatever caused the stone to form in the first place. Most urethral stones started as kidney stones, so the prevention strategy is really about preventing kidney stones from forming. The familiar advice applies: drink enough water to produce at least two liters of urine per day, limit sodium and animal protein intake, and get enough dietary calcium from food rather than supplements. Your doctor may analyze the stone’s composition after removal to guide more specific dietary or medication-based prevention.
For people whose urethral stone was related to an anatomical issue, prevention looks different. If a diverticulum was involved, surgical repair of the diverticulum is part of the treatment plan; otherwise the stagnant pocket will keep producing stones. If a stricture contributed to the impaction, addressing the stricture through dilation or surgical repair reduces the chance that a future stone will get stuck in the same spot. And if the patient has a congenital anomaly like hypospadias, long-term urological follow-up is important because the altered anatomy carries ongoing risks.
There is also the question of whether a stone stuck in the urethra is truly a one-off event or part of a pattern. If you have had multiple kidney stones, the odds of another one eventually finding its way into your urethra are higher simply because there are more stones in the pipeline. Stone formers who have passed a urethral stone have a concrete reason to take prevention seriously, because the next stone may not pass as easily, or at all.