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Stone with Urine Infection: Why It Can Be Dangerous

Stone with Urine Infection: Why It Can Be Dangerous

📖 9 min read Written/reviewed by Dr. Alhad Naragude, MBBS, MS, DrNB Urology Last updated: June 18, 2026

A stone with urine infection can be dangerous when the stone blocks urine flow. If infected urine gets trapped above a kidney or ureter stone, bacteria and pressure can build up quickly. This can lead to kidney infection, pus in the kidney, kidney damage or urosepsis – infection spreading into the bloodstream. A stone with fever, chills, vomiting, weakness, confusion or reduced urine output is not a routine stone attack. It needs urgent medical care. Some patients need emergency drainage with a DJ stent or nephrostomy tube, along with antibiotics. EAU guidelines describe an obstructed kidney with UTI signs or no urine output as a urological emergency.

Quick answer: when is it dangerous?

A stone with urine infection becomes dangerous when there is infection plus blockage.

Think of it in three levels:

Situation Risk level What it usually means
Stone without fever, urine flowing well Lower risk Pain control, medicines or planned stone treatment may be enough
Stone with urine infection but no blockage Moderate risk Needs urine culture, antibiotics and close follow-up
Stone with fever, hydronephrosis or sepsis signs High risk May need admission, IV antibiotics and urgent drainage

The most important warning sign is fever or chills with stone pain.

What does “stone with urine infection” mean?

It means a person has a kidney stone or ureter stone along with signs of urinary infection.

This may show as:

  • Burning while passing urine.
  • Frequent urination.
  • Fever or chills.
  • Cloudy, dark, bloody or foul-smelling urine.
  • Pus cells in urine routine test.
  • Positive urine culture.
  • Raised WBC count or CRP.
  • Raised creatinine if kidney function is affected.

A mild urine infection with a small, non-blocking stone may sometimes be managed with medicines and follow-up. But if a stone blocks urine flow and the urine above the stone is infected, the situation can become serious quickly.

This is called an infected obstructed kidney.

Why is stone with urine infection dangerous?

1. The stone may trap infected urine

The ureter is the tube that carries urine from the kidney to the bladder. If a stone gets stuck in the ureter, urine may collect above the stone. This kidney swelling is called hydronephrosis.

If that collected urine is infected, the kidney becomes like a closed infected pressure system. Antibiotics are important, but if infected urine cannot drain, antibiotics alone may not be enough.

2. Infection can spread into the blood

Kidney infection can sometimes progress to sepsis. NIDDK lists kidney infection symptoms such as fever, chills, cloudy or foul-smelling urine, painful urination, back/side/groin pain, nausea and vomiting. It also warns that kidney infection can rarely lead to life-threatening sepsis, with symptoms such as confusion, rapid breathing, fast heart rate, severe pain and shortness of breath.

3. Kidney function can worsen

Blocked urine increases pressure inside the kidney. Infection plus blockage can affect kidney function, especially in people with diabetes, single kidney, chronic kidney disease, dehydration, pregnancy, elderly age or stones on both sides.

4. Some stones are infection-related

Some stones, especially struvite stones, are linked to recurrent urine infection. These stones can grow large and may recur if infection or stone fragments remain. Stone analysis and follow-up are important in recurrent or infection-related stones.

Symptoms of stone with urine infection

Kidney stones can cause sharp pain in the back, side, lower abdomen or groin, blood in urine, frequent urination, painful urination, inability to pass urine or passing only a small amount, and cloudy or bad-smelling urine. NIDDK advises seeking care right away for these symptoms because they may indicate a stone or a more serious condition.

Symptoms suggesting infection include:

  • Fever.
  • Chills or shivering.
  • Burning urine.
  • Cloudy or foul-smelling urine.
  • Nausea or vomiting.
  • Severe weakness.
  • Fast pulse.
  • Reduced urine output.
  • Drowsiness or confusion.

Emergency signs: go to hospital urgently

Do not wait at home if you have a stone and any of these:

  • Fever or chills.
  • Severe pain with vomiting.
  • Drowsiness, confusion or extreme weakness.
  • Very low urine output.
  • Single kidney.
  • Diabetes with fever or urinary infection.
  • Pregnancy with stone pain and fever.
  • Low blood pressure, fast pulse or breathing difficulty.
  • Rising creatinine.
  • Ultrasound or CT showing hydronephrosis with infection.

NICE recommends hospital referral for acute pyelonephritis when there are signs suggesting serious illness such as sepsis. It also advises considering referral or specialist advice for higher-risk patients, including those who are pregnant, dehydrated, unable to take oral medicines, immunosuppressed, diabetic or have suspected structural or functional urinary tract abnormality.

How is stone with urine infection diagnosed?

A urologist checks two things:

1. Is there infection?

2. Is urine blocked?

Both answers matter. Infection without blockage and infection with blockage are treated differently.

Urine routine and microscopy

This checks for pus cells, red blood cells, bacteria, nitrites and other infection markers.

Urine culture

Urine culture identifies the bacteria and helps choose the correct antibiotic. It is best sent before antibiotics when possible, especially if fever or recurrent infection is present.

Blood tests

Common tests include:

  • CBC.
  • Creatinine.
  • Electrolytes.
  • CRP.
  • Blood sugar.
  • Blood culture if fever or sepsis is suspected.

Ultrasound KUB

Ultrasound helps detect hydronephrosis, kidney swelling, larger stones and bladder urine.

CT KUB

CT KUB gives clearer information about stone size, stone location and obstruction. It is especially useful when pain is severe, diagnosis is uncertain or surgery may be needed. EAU notes that non-contrast CT is used to confirm stone diagnosis in acute flank pain and is superior to IVU.

Stone with urine infection treatment

Treatment depends on the patient’s condition, fever, blood pressure, kidney function, urine culture, stone size, stone location and whether urine is blocked.

Stone with Urine Infection: Emergency Drainage May Be Needed

If there is an obstructing stone with infection or sepsis, the first priority is not stone breaking.

The first priority is:

1. Stabilise the patient.

2. Start antibiotics.

3. Send urine and blood cultures when needed.

4. Drain the blocked infected kidney.

5. Remove the stone later after infection settles.

EAU recommends urgent decompression of the collecting system in sepsis with obstructing stones, using either ureteral stenting or percutaneous nephrostomy. It also recommends starting antibiotics immediately, collecting urine for antibiogram testing, re-evaluating antibiotics after culture results and delaying definitive stone treatment until sepsis resolves.

DJ stent vs nephrostomy: what is the difference?

Feature DJ stent Nephrostomy tube
Where it drains Kidney to bladder internally Kidney to external urine bag
How it is placed Through urinary passage using cystoscope Through back into kidney under imaging
External bag No Yes
Common use Ureter can be reached safely Very sick patient, difficult stenting, pus under pressure or high anaesthesia risk
Comfort issues Frequency, urgency, burning, stent discomfort Tube care, bag care, back-site discomfort
Purpose Temporary drainage Temporary drainage

EAU notes that ureteral stents and percutaneous nephrostomy catheters are both effective options for decompression of the renal collecting system.

Are antibiotics enough?

Antibiotics are necessary, but in an infected obstructed kidney, they may not be enough unless the blocked urine is drained.

This is why some patients improve only after DJ stent or nephrostomy drainage. After drainage, antibiotics may be changed based on urine culture or blood culture reports.

Do not self-medicate with leftover antibiotics if you have stone pain with fever. It may delay proper treatment, affect culture results and allow infection to worsen.

When is the stone removed?

In many cases, the stone is removed later, after:

  • Fever settles.
  • Blood pressure and pulse are stable.
  • WBC count and CRP improve.
  • Creatinine improves.
  • Urine culture is controlled.
  • The patient is fit for anaesthesia.

Definitive treatment may include:

  • URSL for ureter stone.
  • RIRS for selected kidney or upper ureter stones.
  • PCNL for large kidney stones.
  • Mini-PCNL for selected stones.
  • ESWL in selected non-emergency stones.

Immediate stone removal during active infection is usually avoided unless the urologist decides it is safe in a specific situation.

What is normal after DJ stent or nephrostomy?

After drainage, fever and pain often improve, but recovery depends on infection severity.

After a DJ stent, you may have:

  • Mild burning urine.
  • Frequent urination.
  • Urgency.
  • Mild blood in urine.
  • Flank or bladder discomfort.

After nephrostomy, you may have:

  • Urine draining into a bag.
  • Mild back discomfort.
  • Dressing care needs.
  • Instructions to avoid pulling or bending the tube.

Persistent fever, worsening pain, reduced urine output, confusion, breathlessness or severe weakness needs urgent reassessment.

Can stone with urine infection happen again?

Yes. Recurrence is more likely if:

  • Stone fragments remain.
  • Hydration is poor.
  • Diabetes is uncontrolled.
  • UTI keeps recurring.
  • The stone is infection-related.
  • There is an anatomical blockage.
  • Follow-up is missed.
  • A DJ stent is forgotten or not removed on time.

Prevention may include stone analysis, follow-up imaging, urine culture, metabolic stone evaluation in recurrent cases, good fluid intake, diabetes control and timely removal of stents.

What to bring for consultation

Bring:

  • USG KUB report and films.
  • CT KUB report and images, if done.
  • Urine routine report.
  • Urine culture report.
  • CBC, creatinine, CRP and electrolytes.
  • Fever chart, if available.
  • Current antibiotics and painkillers.
  • Diabetes, BP, heart or kidney disease reports.
  • Previous stone surgery records.
  • DJ stent or nephrostomy details, if already placed.
  • Discharge summaries from previous admissions.

FAQs

Is stone with urine infection always dangerous?

Not always. A mild urine infection with a small non-blocking stone may be treated with medicines and follow-up. But a stone with fever, chills, vomiting, hydronephrosis, low urine output or sepsis signs can be dangerous.

Why is fever with kidney stone serious?

Fever may mean infection. If the stone is blocking urine flow, infected urine can get trapped above the stone and spread into the bloodstream.

Can antibiotics cure stone with urine infection?

Antibiotics are important, but if the kidney is blocked, antibiotics alone may not be enough. Drainage with a DJ stent or nephrostomy may be needed.

Which is better: DJ stent or nephrostomy?

Both can drain the kidney. The choice depends on patient condition, stone position, anatomy, anaesthesia risk and available expertise.

Can the stone be removed during infection?

Usually, definitive stone removal is delayed until infection and sepsis settle. In emergency, the first priority is drainage and antibiotics.

What happens if treatment is delayed?

Delay can lead to worsening infection, pus in the kidney, kidney function deterioration, sepsis, ICU admission or rarely life-threatening complications.

Should a DJ stent be removed later?

Yes. A DJ stent is temporary. Forgotten stents can cause infection, stone formation and complications. Always follow your urologist’s stent removal plan.

Related reading

References

Note: This information is for educational purposes only and is not a substitute for medical advice. Please consult your doctor for any symptoms.