An infected kidney stone occurs when a urinary stone is associated with a bacterial urinary infection. The situation becomes particularly serious when the stone blocks the normal flow of urine.

A kidney stone can obstruct the ureter and prevent infected urine from draining properly. When infection and urinary obstruction occur together, the condition can deteriorate rapidly and may lead to sepsis or serious kidney complications. Urgent medical assessment is therefore important.

Treatment is not simply a matter of taking a painkiller or waiting for the stone to pass. Depending on the patient's condition, treatment may require antibiotics, urgent drainage of the kidney and later definitive stone removal.

At Prabhakar Bhurke Clinic, Dr. Sandip Prabhakar Bhurke, super specialist nephrologist and transplant physician, provides specialist assessment of kidney infections, kidney-function problems and complications associated with urinary stones.

How Does a Kidney Stone Become Associated With Infection?

Kidney stones can interfere with normal urinary drainage.

A stone may:

• Obstruct the ureter

• Slow urine flow

• Cause urinary stasis

• Irritate the urinary tract

• Be associated with recurrent urinary infections

Some types of stones, particularly struvite or infection stones, are associated with certain urinary bacteria. Recurrent infections can also occur in people who have urinary stones.

The combination of a blocked urinary system and infection is more concerning than either problem alone.

What Are the Symptoms of an Infected Kidney Stone?

Symptoms can vary, but an infected stone may produce a combination of stone-related and infection-related symptoms.

Possible symptoms include:

• Fever

• Chills or shivering

• Flank or back pain

• Severe pain on one side

• Burning while urinating

• Frequent urination

• Urgent need to urinate

• Cloudy or foul-smelling urine

• Blood in the urine

• Nausea

• Vomiting

• Weakness or feeling unusually unwell

• Reduced urine output

Kidney infection commonly causes fever, back or side pain and painful urination.

A person with a known kidney stone who develops fever or chills should not assume that the symptoms are simply part of the stone passing.

When Is an Infected Kidney Stone an Emergency?

An infected and obstructed kidney can become a urological emergency.

Urgent medical attention is especially important when a person with a kidney stone develops:

• Fever or chills

• Severe flank pain with fever

• Very little or no urine

• Persistent vomiting

• Confusion

• Severe weakness

• Rapid heartbeat or feeling faint

• Low blood pressure

• Rapid deterioration

An obstructed infected kidney may require immediate drainage to relieve the obstruction and control the infection.

Do not wait for a stone to pass naturally when infection and obstruction are suspected.

Why Can an Infected Blocked Kidney Become Dangerous?

Normally, urine flows from the kidneys through the ureters into the bladder.

If a stone blocks this pathway, infected urine may become trapped above the obstruction.

This can create a serious situation because:

1. Bacteria can multiply in the obstructed urinary system.

2. Pressure can build up within the collecting system.

3. Infection may spread into the bloodstream.

4. Severe infection can lead to sepsis.

5. Kidney function may deteriorate, particularly in vulnerable patients.

Kidney infections can rarely lead to kidney failure or sepsis, especially when risk factors such as urinary blockage, diabetes, kidney disease or an impaired immune system are present.

How Is an Infected Kidney Stone Diagnosed?

The doctor needs to determine two things:

Is there an infection?

and

Is the urinary tract blocked?

Both questions are important for deciding treatment.

Urine Examination

A urine test may identify:

• White blood cells

• Bacteria

• Blood

• Other signs of infection

• Crystals or mineral abnormalities

Urinalysis can help identify a urinary infection, while urine culture can help determine the bacteria responsible and guide antibiotic selection.

Urine Culture

A urine culture may be particularly important when infection is suspected.

The result can help the medical team select an antibiotic that is appropriate for the identified organism.

Blood Tests

Depending on the severity of illness, tests may include:

• Complete blood count

• Serum creatinine

• eGFR

• Urea

• Electrolytes

• Blood cultures when systemic infection is suspected

• Other tests based on the clinical condition

Kidney-function testing is important because obstruction and severe infection can affect renal function.

Ultrasound

Ultrasound can help identify:

• Kidney stones

• Hydronephrosis

• Urinary obstruction

• Changes in kidney structure

CT Scan

When more detailed information is required, CT imaging may help determine:

• Stone size

• Stone location

• Number of stones

• Degree of obstruction

• Other abnormalities

The choice of imaging depends on the patient's condition and clinical findings.

What Is the First Step in Infected Kidney Stone Treatment?

The treatment priority depends on whether the kidney is infected and obstructed.

If infection is present without significant obstruction, appropriate antibiotic treatment may sometimes be sufficient initially.

However, when infection is combined with significant urinary obstruction, antibiotics alone may not be enough.

The blocked system may need to be drained urgently.

This distinction is one of the most important aspects of infected kidney stone treatment.

Antibiotics for an Infected Kidney Stone

Bacterial kidney infections are generally treated with antibiotics.

The choice of antibiotic depends on factors such as:

• The suspected or identified bacteria

• Urine culture results

• Local antibiotic resistance

• Drug allergies

• Kidney function

• Severity of infection

• Other medicines

• Whether the patient needs hospitalization

Antibiotics may be given orally or intravenously depending on the severity of the infection. People who are seriously ill may require hospital treatment and IV antibiotics or fluids.

Do not self-prescribe antibiotics for an infected kidney stone.

An inappropriate antibiotic may fail to control the infection and can contribute to antibiotic resistance.

Why Antibiotics Alone May Not Be Enough

A common mistake is to think that antibiotics can simply “clear” an infection while leaving a blocked kidney untreated.

If infected urine cannot drain because a stone is obstructing the urinary tract, the obstruction may need to be relieved.

In this situation, the immediate objective is often:

Control the infection + establish urine drainage.

Definitive stone removal may be performed after the acute infection has been appropriately controlled.

How Is an Obstructed Infected Kidney Drained?

Two commonly used methods are:

Ureteral Stent

A thin tube called a ureteral stent can be placed through the urinary tract to allow urine to flow from the kidney to the bladder.

It can bypass the obstructing area and help establish drainage.

Percutaneous Nephrostomy

A nephrostomy tube can be inserted through the skin directly into the kidney to drain urine externally.

The choice between a ureteral stent and nephrostomy depends on the patient's anatomy, stone location, severity of infection, available expertise and overall clinical condition.

Both methods are established approaches for urgent decompression of an obstructed infected urinary system.

Is the Stone Removed Immediately During Infection?

Usually, definitive stone removal is not the first priority when an obstructed kidney is actively infected.

The initial priorities are:

1. Stabilize the patient.

2. Start appropriate antimicrobial treatment.

3. Drain the obstructed urinary system when required.

4. Control the infection.

5. Plan definitive stone treatment after the acute infection has settled.

The European Association of Urology patient guidance specifically describes immediate decompression for an obstructed infected kidney, followed by antibiotics, with stone removal performed after the infection has resolved.

The exact timing is individualized by the treating medical team.

When Is Kidney Stone Removal Performed?

Once the infection has been appropriately treated and the patient is clinically stable, the underlying stone can be addressed.

Treatment depends on:

• Stone size

• Stone location

• Stone composition

• Number of stones

• Urinary anatomy

• Kidney function

• Previous procedures

• Overall health

Potential procedures include:

Ureteroscopy and Laser Lithotripsy

A ureteroscope can be passed through the urinary tract to reach the stone.

Laser energy may then fragment the stone into smaller pieces, which can be removed or allowed to pass depending on the situation.

Shock Wave Lithotripsy

Shock waves can be used to fragment selected stones from outside the body.

Suitability depends on the stone's characteristics and the patient's anatomy.

Percutaneous Nephrolithotomy

For larger or complex renal stones, PCNL may be considered.

The stone is accessed through a small tract created into the kidney and removed or fragmented using specialized instruments.

The most appropriate procedure should be decided after imaging and specialist assessment.

What Are Infection Stones?

Some kidney stones develop in association with urinary bacteria.

Struvite stones are a well-known example of infection-related stones.

These stones can grow rapidly in some patients and may form larger stone burdens.

Treatment may involve:

• Treating the infection

• Removing the stone burden when appropriate

• Addressing recurrent infection

• Follow-up to reduce recurrence risk

A stone analysis may help identify the composition of the stone and guide future prevention.

Can an Infected Kidney Stone Cause Kidney Damage?

Yes.

A stone that causes persistent obstruction can interfere with normal urine drainage.

When infection is also present, the risk of serious complications increases.

Potential complications include:

• Acute kidney injury

• Worsening kidney function

• Recurrent infection

• Kidney scarring

• Sepsis

• In severe cases, kidney failure

Kidney stones that remain untreated can cause urinary infections and, in some circumstances, loss of kidney function.

The risk depends on factors such as the degree and duration of obstruction, infection severity, whether one or both kidneys are affected and the patient's baseline kidney function.

What If Both Kidneys Are Affected?

Bilateral obstruction or infection requires particularly careful evaluation.

The situation can be more serious if:

• Both ureters are blocked

• The patient has only one functioning kidney

• Baseline kidney function is already reduced

• Urine output is falling

• Severe infection is present

Urgent specialist assessment is important in these circumstances.

Can an Infected Kidney Stone Pass Naturally?

A small stone may sometimes pass naturally, but infection changes the situation.

A patient should not rely on spontaneous stone passage when there is:

• Fever

• Chills

• Significant obstruction

• Reduced urine output

• Worsening kidney function

• Severe systemic illness

The immediate concern is controlling infection and ensuring adequate urinary drainage.

Should You Drink More Water During an Infected Kidney Stone?

Adequate hydration can be important during urinary infections and stone disease, but forcing excessive amounts of water is not a substitute for medical treatment.

If a stone is blocking urine flow, drinking large quantities of water will not mechanically remove the obstruction.

Fluid recommendations should also be individualized for people with:

• Chronic kidney disease

• Kidney failure

• Heart failure

• Fluid restrictions

• Severe vomiting

• Reduced urine output

NIDDK advises discussing the appropriate amount of fluid with a healthcare professional when other health conditions affect fluid needs.

Pain Relief During Infected Kidney Stone Treatment

Kidney stones can cause severe renal colic.

Pain management may be part of treatment, but pain medicine does not treat the infection or remove an obstruction.

The choice of analgesic should consider:

• Kidney function

• Dehydration

• Blood pressure

• Stomach and bleeding risk

• Other medicines

• Pregnancy when applicable

People with kidney disease should not routinely self-medicate with NSAIDs without medical advice.

What Happens After the Infection Clears?

After the acute infection is controlled, the medical team can focus on definitive stone management and prevention.

Follow-up may include:

• Repeat urine testing

• Kidney-function testing

• Imaging

• Stone analysis

• Metabolic evaluation when appropriate

• Review of fluid intake

• Dietary assessment

• Prevention of recurrent urinary infections

Understanding why the stone developed can help reduce the likelihood of future stone formation.

How Can Future Infected Kidney Stones Be Prevented?

Prevention depends on the type of stone and the underlying urinary problem.

Possible measures include:

• Maintaining appropriate fluid intake

• Avoiding excessive dietary sodium

• Treating recurrent urinary infections appropriately

• Following a personalized stone-prevention diet

• Taking prescribed preventive medicines

• Completing recommended metabolic evaluation

• Attending follow-up imaging when advised

• Having recurrent or infection-related stones assessed by a specialist

There is no single prevention plan that applies to every stone former.

When Should You See a Kidney Specialist?

Specialist evaluation may be appropriate when you have:

• Recurrent kidney stones

• Repeated urinary infections

• Elevated creatinine

• Reduced eGFR

• Protein in urine

• Urinary obstruction

• Hydronephrosis

• A history of infected stones

• A single functioning kidney

• Bilateral stones

• Recurrent stone-related complications

A nephrologist can evaluate kidney function and associated medical problems, while a urologist generally manages many procedures used to drain an obstructed urinary tract and remove stones.

Infected Kidney Stone Evaluation at Prabhakar Bhurke Clinic

At Prabhakar Bhurke Clinic, Dr. Sandip Prabhakar Bhurke, super specialist nephrologist and transplant physician, provides individualized kidney evaluation for patients with kidney stones, urinary infections and kidney-function concerns.

Depending on the patient's condition, assessment may include:

• Review of stone-related symptoms

• Kidney-function testing

• Creatinine and eGFR assessment

• Urine examination and culture review

• Assessment of infection severity

• Evaluation of urinary obstruction

• Review of ultrasound or CT findings

• Assessment of recurrent urinary infections

• Management of associated kidney complications

• Coordination with appropriate urological specialists when drainage or stone removal is required

• Follow-up kidney care after treatment

When an infected obstructed kidney is suspected, urgent medical treatment takes priority over routine outpatient stone management.

Frequently Asked Questions

What is the best treatment for an infected kidney stone?

Treatment depends on whether the stone is causing obstruction and how severe the infection is. Antibiotics are used for bacterial infection, while an infected obstructed kidney may require urgent drainage with a ureteral stent or nephrostomy before definitive stone removal.

Can antibiotics remove an infected kidney stone?

Antibiotics treat bacterial infection but generally do not remove a physical stone. The stone may require separate treatment after the infection is controlled.

Is an infected kidney stone an emergency?

An infected kidney with urinary obstruction can be a medical emergency. Fever or chills with flank pain and a known or suspected obstructing stone requires prompt medical assessment.

Can an infected kidney stone cause sepsis?

Yes. A serious kidney infection can spread beyond the urinary tract and, in severe cases, lead to sepsis. Early treatment is important.

Should the stone be removed while the infection is active?

When an infected kidney is obstructed, the immediate priority is generally drainage and infection control. Definitive stone removal is usually planned after the acute infection has been treated, based on the patient's condition.

Can a kidney stone cause a urinary infection?

Yes. Stones can obstruct urinary flow and are associated with urinary infections. Some stones, such as struvite stones, are specifically associated with infection-related stone formation.

Can an infected kidney stone damage kidney function?

It can. Persistent obstruction, infection or both may cause acute kidney injury and other complications, particularly in patients who already have reduced kidney function.

Can drinking water cure an infected kidney stone?

No. Appropriate hydration may be part of general care, but water cannot replace antibiotics or urgent drainage when an infected urinary system is obstructed.

Conclusion

Infected kidney stone treatment requires more than treating pain or waiting for the stone to pass. The most important issue is determining whether the stone has caused urinary obstruction and infection at the same time.

A bacterial infection may require appropriate antibiotics, while an infected obstructed kidney may require urgent drainage through a ureteral stent or nephrostomy. Definitive stone removal is generally planned after the acute infection has been controlled.

Fever, chills, severe flank pain, vomiting, reduced urine output, confusion or rapidly worsening health in a person with a kidney stone should be treated as warning signs requiring prompt medical attention.

For individualized evaluation of kidney stones, infections and associated kidney-function problems, consult Dr. Sandip Prabhakar Bhurke at Prabhakar Bhurke Clinic.

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 emergency care. An infected kidney stone can become serious, particularly when the stone blocks urinary drainage. Antibiotic selection, drainage procedures and stone-removal decisions must be individualized according to the infection, urine culture, stone characteristics, kidney function and overall health. Do not self-start antibiotics, painkillers or herbal remedies, and do not attempt to force a suspected obstructing stone to pass by drinking excessive amounts of water. Fever, chills, severe flank pain, persistent vomiting, very little or no urine, confusion, fainting or rapidly worsening symptoms require urgent medical assessment. Consult Dr. Sandip Prabhakar Bhurke or an appropriate qualified nephrology/urology specialist for individualized care.