Hydronephrosis means swelling or enlargement of the kidney because urine is not draining normally from the kidney to the bladder.
Normally, urine flows from the kidney through the ureter and into the bladder. If this pathway becomes narrowed or blocked, urine can build up inside the kidney. This increased pressure can cause the collecting system of the kidney to become dilated.
Hydronephrosis may affect:
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One kidney
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Both kidneys
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Part of the urinary drainage system
The condition can occur suddenly or develop gradually.
Importantly, hydronephrosis is usually a consequence of another problem rather than a disease by itself. Therefore, effective kidney hydronephrosis treatment begins by identifying and correcting the reason urine flow is impaired.
At Prabhakar Bhurke Clinic, Dr. Sandip Prabhakar Bhurke, super specialist nephrologist and transplant physician, provides specialist assessment for patients with hydronephrosis, abnormal kidney function and related urinary problems.
Why Does Hydronephrosis Develop?
Anything that interferes with normal urine drainage can potentially produce hydronephrosis.
Common causes include:
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Kidney or ureteral stones
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Narrowing of the ureter
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Enlarged prostate
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Ureteropelvic junction obstruction
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Tumors or masses pressing on the urinary tract
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Blood clots
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Certain congenital urinary abnormalities
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Bladder-emptying problems
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Pregnancy-related urinary changes in selected cases
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Scarring after previous surgery or inflammation
The cause, location and severity of obstruction determine which treatment is appropriate.
Kidney Hydronephrosis Treatment Starts With Finding the Blockage
There is no single tablet or procedure that treats every case of hydronephrosis.
A specialist first tries to determine:
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Where is urine flow being restricted?
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What is causing the obstruction?
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Is one or both kidneys affected?
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Is kidney function impaired?
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Is infection present?
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How long has the obstruction been present?
These questions are important because untreated obstruction can potentially cause progressive kidney damage.
What Are the Symptoms of Hydronephrosis?
Some people with hydronephrosis have no obvious symptoms, particularly when the condition develops slowly.
When symptoms occur, they may include:
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Pain in the side or back
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Flank discomfort
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Abdominal pain
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Nausea or vomiting
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Changes in urination
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Increased urinary frequency
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Difficulty passing urine
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Blood in the urine
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Fever when infection is present
Symptoms can vary considerably depending on whether the obstruction is sudden or gradual.
A person should not assume that the absence of pain means that hydronephrosis is harmless.
How Is Hydronephrosis Diagnosed?
The purpose of testing is not only to confirm kidney swelling but also to identify its cause and assess whether kidney function has been affected.
Ultrasound
A kidney and urinary tract ultrasound is often useful for identifying dilation of the kidney's collecting system.
It may also provide information about:
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Kidney size
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Degree of dilation
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Urinary retention
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Some stones
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Bladder abnormalities
CT Scan
A CT scan may be recommended when a more detailed assessment is required.
Depending on the clinical situation, imaging can help identify:
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Stones
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The site of obstruction
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Structural abnormalities
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Masses
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Changes in the urinary tract
Blood Tests
Blood testing may include:
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Serum creatinine
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eGFR
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Urea
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Potassium
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Sodium
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Bicarbonate
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Other tests based on the patient's condition
These tests help determine whether obstruction is associated with impaired kidney function.
Urine Testing
Urinalysis and urine culture may be recommended when infection, blood or other urinary abnormalities are suspected.
Does Hydronephrosis Always Require Surgery?
No.
The treatment depends on the cause and severity.
Some mild cases may only require observation and follow-up imaging when there is no significant obstruction or kidney-function deterioration.
Other cases require active intervention to restore urine drainage.
For example:
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A small, resolving obstruction may be monitored.
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A stone causing persistent blockage may require stone removal.
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A ureteral narrowing may need a procedure to improve drainage.
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Prostate-related obstruction may require treatment of the prostate or urinary outlet.
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Severe obstruction with infection may require urgent drainage.
Therefore, surgery should not be considered automatically for every patient with hydronephrosis.
Can Hydronephrosis Be Treated Without Surgery?
In selected patients, yes.
The appropriate approach depends on the underlying problem.
If the obstruction is mild and the kidney remains stable, the doctor may recommend observation with repeat imaging and kidney-function tests.
In some cases, medicines can help treat the underlying condition, but medicines generally cannot physically remove a significant mechanical blockage.
For example, medication may be useful for certain associated conditions, while a stone, severe narrowing or other physical obstruction may require a procedure.
The important distinction is between treating symptoms and restoring urine drainage.
Treatment When a Kidney Stone Causes Hydronephrosis
Kidney stones are an important cause of urinary obstruction.
A stone can obstruct the ureter and prevent urine from flowing normally from the kidney to the bladder.
Depending on the stone's size, location and clinical situation, treatment may include:
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Observation in selected cases
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Medical management
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Shock wave lithotripsy
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Ureteroscopy with laser stone fragmentation
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RIRS for appropriate renal stones
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PCNL for larger or complex kidney stone burdens
The choice depends on imaging findings, kidney function, infection status and other patient-specific factors.
If an obstructed urinary system becomes infected, urgent drainage may be required before definitive stone treatment.
Hydronephrosis From Ureteral Narrowing
A ureteral stricture is a narrowing of the ureter that can restrict urine flow.
Possible causes include previous surgery, instrumentation, stones, inflammation, injury or other conditions.
Treatment may involve procedures designed to improve the diameter or drainage of the ureter.
Depending on the location and severity of the narrowing, options can include:
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Endoscopic treatment
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Balloon dilation
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Stenting
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Reconstructive surgery in selected cases
The appropriate procedure is determined after detailed imaging and specialist assessment.
Hydronephrosis Due to Enlarged Prostate
In men, an enlarged prostate can interfere with bladder emptying.
If urinary retention becomes significant or prolonged, pressure may build up within the urinary system and hydronephrosis can develop.
Treatment focuses on improving urine outflow.
Depending on the severity, management may include:
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Medicines for prostate-related urinary symptoms
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Bladder drainage
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Treatment of urinary retention
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Urological procedures when required
Patients with hydronephrosis and significant prostate-related obstruction may require coordinated nephrology and urology care.
What Is a Ureteral Stent?
A ureteral stent is a thin tube placed inside the ureter to help urine travel from the kidney to the bladder.
A stent may be used when temporary or ongoing support of urinary drainage is required.
It can be considered in situations such as:
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Ureteral obstruction
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Stone-related blockage
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Ureteral swelling
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Certain strictures
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After selected urinary procedures
A stent does not necessarily eliminate the underlying cause. Additional treatment may be needed to address the obstruction itself.
When Is a Nephrostomy Used?
A percutaneous nephrostomy provides an alternative route for urine to leave the kidney.
A small tube is placed through the skin into the kidney under image guidance, allowing urine to drain externally into a collection bag.
Nephrostomy may be considered when:
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Urine drainage needs to be established urgently
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A ureter cannot be adequately drained
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Infection is present behind an obstruction
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A stent cannot be placed or is unsuitable
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Temporary drainage is required before definitive treatment
The choice between a ureteral stent and nephrostomy depends on the cause, anatomy, urgency and patient's clinical condition.
Hydronephrosis With Infection: Why It Can Be Urgent
One of the most important situations is urinary obstruction combined with infection.
A blocked infected kidney may deteriorate rapidly and can potentially lead to severe systemic infection.
Warning signs include:
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Fever
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Chills
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Flank pain
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Vomiting
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Confusion
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Severe weakness
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Reduced urine output
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Rapid worsening of health
This situation requires urgent medical assessment.
When an infected urinary system is obstructed, antibiotics alone may not be sufficient if urine cannot drain properly. Urgent drainage with a stent or nephrostomy may be required, followed by treatment of the underlying obstruction when the infection is controlled.
Can Hydronephrosis Damage the Kidney?
Persistent or severe obstruction can impair kidney function.
The degree of damage depends on factors such as:
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Duration of obstruction
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Complete versus partial blockage
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Whether one or both kidneys are affected
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Presence of infection
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Baseline kidney function
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Underlying cause
A short-lived obstruction may allow substantial recovery after urine flow is restored.
Long-standing obstruction, however, can result in permanent structural and functional damage.
This is why unexplained hydronephrosis should not be ignored.
What Happens if Both Kidneys Have Hydronephrosis?
Hydronephrosis affecting both kidneys can be more concerning because obstruction of both urinary drainage pathways may significantly reduce overall urine production and kidney filtration.
Possible causes include:
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Bladder outlet obstruction
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Severe prostate enlargement
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Extensive urinary tract obstruction
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Certain masses
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Neurological bladder dysfunction
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Other structural abnormalities
Blood tests to assess kidney function and prompt investigation of the obstruction may be particularly important.
Hydronephrosis During Pregnancy
Hydronephrosis-like dilation of the urinary collecting system can occur during pregnancy because of hormonal and anatomical changes.
However, significant symptoms, infection, severe pain or suspected obstruction should be evaluated rather than automatically attributed to pregnancy.
Treatment during pregnancy must take both maternal and fetal considerations into account.
A pregnant patient with fever, severe flank pain, vomiting or urinary symptoms should seek medical assessment promptly.
Hydronephrosis in Children
Hydronephrosis can also occur in children.
Some cases are related to congenital abnormalities affecting urine drainage, such as narrowing at the junction between the kidney and ureter.
Children may have no symptoms and may be diagnosed during prenatal or childhood imaging.
Management depends on:
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Degree of dilation
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Kidney function
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Drainage pattern
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Symptoms
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Risk of urinary infection
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Changes over time
Children with significant or persistent hydronephrosis may require evaluation by an appropriate pediatric urology or nephrology team.
Can Hydronephrosis Go Away on Its Own?
Sometimes.
If the obstruction is temporary and urine flow returns to normal, kidney swelling may improve.
For example, selected cases associated with a transient obstruction may resolve after the underlying problem passes or is treated.
However, persistent hydronephrosis should not simply be left untreated without determining why it is present.
Follow-up imaging can help establish whether dilation is improving, stable or worsening.
How Long Does It Take for Hydronephrosis to Improve?
There is no fixed recovery period.
Improvement depends on:
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Cause of obstruction
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Duration of blockage
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Severity of hydronephrosis
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Whether drainage has been restored
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Presence of infection
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Baseline kidney function
The kidney may remain dilated for some time even after the obstruction has been relieved.
Doctors may therefore use follow-up imaging and kidney-function tests rather than judging recovery solely from symptoms.
What Tests Monitor Recovery?
After treatment, follow-up may include:
Kidney Function Tests
Creatinine and eGFR can help determine whether kidney filtration is improving or remaining impaired.
Repeat Ultrasound
Ultrasound may show whether hydronephrosis is decreasing after urine drainage is restored.
Additional Imaging
Further imaging may be recommended when the original cause remains uncertain or when obstruction persists.
Urine Tests
Urinalysis or urine culture may be repeated when infection or urinary abnormalities remain a concern.
Lifestyle Measures After Hydronephrosis Treatment
Lifestyle changes cannot correct every mechanical obstruction, but they can support overall urinary and kidney health.
Depending on the underlying condition, patients may be advised to:
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Maintain appropriate fluid intake
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Avoid excessive dietary salt
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Follow stone-prevention measures when relevant
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Control blood pressure
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Manage diabetes
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Take prescribed medicines correctly
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Attend follow-up imaging
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Avoid unnecessary kidney-harming medicines
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Seek treatment promptly for urinary symptoms or infection
Fluid intake should be individualized. Patients with reduced kidney function or specific fluid restrictions should follow their doctor's advice rather than deliberately drinking excessive amounts of water.
When Should You See a Kidney Specialist?
A nephrologist may be involved when hydronephrosis is associated with:
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Elevated creatinine
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Reduced eGFR
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Recurrent urinary problems
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Kidney-function deterioration
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Electrolyte abnormalities
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Chronic kidney disease
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Hydronephrosis affecting both kidneys
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Significant medical comorbidities
A urologist may be required when the primary problem involves a structural blockage that needs an endoscopic or surgical procedure.
In many cases, coordinated nephrology and urology care provides a more complete approach.
What Happens During a Hydronephrosis Consultation?
A specialist may review:
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Current symptoms
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Previous ultrasound or CT reports
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Creatinine and eGFR results
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Urine tests
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Previous kidney stones
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History of urinary infections
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Medication history
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Previous urinary procedures
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Blood-pressure and diabetes status
The doctor can then determine whether observation, further testing, drainage or treatment of the underlying cause is appropriate.
Kidney Hydronephrosis Treatment at Prabhakar Bhurke Clinic
At Prabhakar Bhurke Clinic, Dr. Sandip Prabhakar Bhurke, super specialist nephrologist and transplant physician, provides individualized evaluation for hydronephrosis and associated kidney-function problems.
Depending on the patient's condition, care may include:
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Assessment of kidney function
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Review of hydronephrosis imaging
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Evaluation of elevated creatinine
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Assessment for urinary obstruction
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Evaluation of infection-related complications
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Monitoring after obstruction is relieved
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Management of associated chronic kidney disease
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Kidney stone-related kidney-function assessment
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Coordination with urology or other specialists when a procedure is required
The treatment plan is based on the cause of hydronephrosis, severity of obstruction, kidney function and overall clinical condition.
Frequently Asked Questions
What is the treatment for hydronephrosis of the kidney?
Treatment depends on why urine is not draining properly. Mild cases may sometimes be monitored, while persistent obstruction may require a stent, nephrostomy or a procedure to correct the underlying cause.
Can hydronephrosis be cured without surgery?
Some mild or temporary cases can improve without surgery when the obstruction resolves. However, a significant mechanical blockage may require a procedure to restore urine flow.
Is hydronephrosis dangerous?
Hydronephrosis can become serious when obstruction is severe, prolonged, affects both kidneys, causes kidney-function deterioration or occurs with infection.
Can drinking water cure hydronephrosis?
No. Adequate hydration may be appropriate for many people, but drinking excessive water does not remove a mechanical urinary obstruction.
Does hydronephrosis cause kidney failure?
Severe or prolonged obstruction can impair kidney function and, in some cases, contribute to kidney failure. Early identification and treatment may help protect kidney function.
Is a kidney stent always required for hydronephrosis?
No. A stent is used in selected situations where improving or maintaining urine drainage is necessary. The need depends on the cause and severity of obstruction.
Can hydronephrosis disappear?
Yes, hydronephrosis may improve when the underlying obstruction resolves or is successfully treated. Persistent dilation requires appropriate follow-up.
Which doctor treats hydronephrosis?
A nephrologist evaluates kidney function and medical kidney problems, while a urologist manages many structural urinary obstructions and procedures. Depending on the cause, both specialists may be involved.
Conclusion
Kidney hydronephrosis treatment is primarily about restoring or protecting normal urine drainage and addressing the cause of the obstruction. Hydronephrosis itself is a finding that can result from kidney stones, ureteral narrowing, prostate enlargement, congenital abnormalities, masses and other urinary conditions.
Some mild cases can be monitored, while significant obstruction may require active treatment such as a ureteral stent, nephrostomy, stone removal or another procedure.
The possibility of kidney damage increases when obstruction is severe or prolonged, and an infected obstructed urinary system requires urgent medical attention.
If hydronephrosis has been identified on an ultrasound or CT scan, appropriate evaluation of the cause and kidney function is important. Dr. Sandip Prabhakar Bhurke at Prabhakar Bhurke Clinic provides specialist nephrology evaluation and individualized kidney care for patients with hydronephrosis and related kidney-function concerns.
Medical Disclaimer
This article is intended for general educational and informational purposes only and should not be considered a substitute for medical diagnosis, treatment or professional advice. Hydronephrosis can have many causes, and the appropriate treatment depends on the location and severity of obstruction, kidney function, infection status and the patient's overall health. Do not attempt to treat urinary obstruction by excessive water intake or unprescribed medicines. Fever, chills, severe flank pain, persistent vomiting, confusion, very little or no urine or rapidly worsening symptoms may indicate a serious complication requiring urgent medical attention. Consult Dr. Sandip Prabhakar Bhurke or another qualified healthcare professional for an individualized evaluation and treatment plan.
