Bladder Stones:
Symptoms, Causes and Diagnosis
Learn how bladder stones form, the symptoms they may cause, and why identifying underlying bladder emptying problems is often an important part of treatment.
Bladder stones are hard mineral deposits that form within the bladder. Unlike kidney stones, they are often associated with incomplete bladder emptying, prostate enlargement, recurrent infections, or bladder dysfunction. Identifying why a bladder stone has formed is often an important part of treatment.
What Are Bladder Stones?
Bladder stones are hard mineral deposits that develop within the urinary bladder.
They form when urine remains in the bladder after urination and becomes concentrated over time. Minerals within the urine can gradually crystallise, eventually forming a stone.
Bladder stones vary in size. Some are discovered incidentally during imaging tests, while others cause bothersome urinary symptoms, infections, or difficulty passing urine.
Although bladder stones and kidney stones are both forms of urinary stone disease, they often develop for different reasons.
At a Glance
Bladder Stones
- Form within the urinary bladder rather than the kidneys
- Often develop when the bladder does not empty completely
- Commonly associated with prostate enlargement in older men
- May cause urinary symptoms, infections, or blood in the urine
- Can occur alongside bladder outlet obstruction, urethral stricture disease, or neurogenic bladder
- Investigation usually focuses on both the stone and the underlying cause
- Recurrence may occur if bladder emptying problems remain untreate
Why Do Bladder Stones Form?
For many people, a bladder stone is not simply an isolated finding.
The bladder normally empties urine during urination. When urine remains behind after emptying, minerals have more opportunity to crystallise and accumulate.
Over time, these deposits may grow into bladder stones.
The reason for incomplete emptying can vary and often requires further evaluation.
Why Are Bladder Stones More Common in Older Men?
One of the most common contributing factors is benign prostatic hyperplasia (BPH), also known as prostate enlargement.
As the prostate enlarges, it may obstruct urine flow and make it more difficult for the bladder to empty completely.
Not everyone with prostate enlargement develops bladder stones, but long-standing incomplete emptying can increase the likelihood of stone formation.
For this reason, the presence of a bladder stone sometimes prompts further assessment of prostate health and bladder function.
Other Causes of Bladder Stones
Several conditions may contribute to stone formation within the bladder.
Bladder Outlet Obstruction
Any condition that interferes with normal urine flow may increase the risk of bladder stone formation.
Neurogenic Bladder
Conditions affecting bladder nerve function may impair bladder emptying.
Urethral Stricture Disease
Narrowing of the urethra can restrict urine flow and contribute to urine retention.
Long-Term Catheterisation
Bladder stones can develop around catheter material or in situations where bladder drainage remains impaired.
Bladder Diverticula
Pouches within the bladder wall may trap urine and create an environment where stones can develop.
Can Bladder Stones Form Without Kidney Stones?
Many people assume that all urinary stones begin in the kidneys. However, bladder stones often form independently within the bladder itself.
Unlike kidney stones, bladder stones are frequently associated with incomplete bladder emptying, urinary retention, or conditions that affect normal urine flow.
Some patients may have both kidney stones and bladder stones, but the presence of a bladder stone does not necessarily mean a stone has travelled from the kidney.
What Symptoms Can Bladder Stones Cause?
The symptoms of bladder stones can vary considerably.
Possible symptoms include:
- Frequent urination
- Sudden urgency to pass urine
- Interrupted urinary stream
- Difficulty emptying the bladder
- Lower abdominal discomfort
- Blood in the urine
- Recurrent urinary tract infections
- Cloudy urine
- Pain or burning during urination
- Difficulty starting urination
In some cases, bladder stones are discovered before significant symptoms develop.
How Are Bladder Stones Diagnosed?
Assessment may involve a combination of:
- Medical history and symptom review
- Urine testing
- Ultrasound
- X-ray
- CT scan
- Flexible cystoscopy
These investigations help confirm the presence of a bladder stone and identify conditions that may have contributed to its development.
Flexible cystoscopy may sometimes provide the most direct way of visualising a bladder stone while also assessing for bladder outlet obstruction, urethral narrowing, or other abnormalities within the lower urinary tract.
Is Removing the Stone Enough?
Removing a bladder stone may improve symptoms, but it does not always explain why the stone formed.
Further evaluation may be required to determine whether prostate enlargement, bladder emptying difficulties, urethral narrowing, or another condition contributed to stone formation.
Addressing these factors may help reduce the risk of future stones.
Can Bladder Stones Come Back?
The likelihood of recurrence depends largely on whether the underlying cause remains present.
For example, a bladder stone associated with chronic urinary retention may recur if bladder emptying problems continue over time.
Follow-up may therefore focus not only on the stone itself, but also on the function of the bladder and urinary tract.
Frequently Asked Questions
Are bladder stones the same as kidney stones?
No. Kidney stones form within the kidneys, whereas bladder stones develop inside the bladder. The causes, symptoms, and treatment approaches may differ.
Can prostate enlargement cause bladder stones?
Yes. Long-standing difficulty emptying the bladder due to prostate enlargement is one of the most common reasons bladder stones develop in older men.
Do bladder stones always cause symptoms?
No. Some bladder stones are discovered incidentally during investigations performed for other reasons.
Can bladder stones cause urinary tract infections?
Yes. Bladder stones may irritate the bladder lining and contribute to recurrent urinary infections.
Can bladder stones affect urine flow?
Yes. Depending on their size and position, bladder stones may interfere with bladder emptying and contribute to urinary symptoms.
Can bladder stones come back after treatment?
They can. The risk of recurrence is influenced by whether the underlying cause of stone formation has been identified and addressed.
Assessment of Bladder Stones and Bladder Emptying Problems
Bladder stones are often associated with conditions that affect normal bladder emptying. Assessment may therefore involve investigating both the stone itself and any underlying urinary tract abnormalities that contributed to its formation.
Appointments with Dr Roger Anthony Idi are arranged through Prince Court Medical Centre.