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Can Kidney Stone Damage the Kidney?

Can Kidney Stone Damage the Kidney?

📖 9 min read Written/reviewed by Dr. Alhad Naragude, MBBS, MS, DrNB Urology Last updated: June 5, 2026

Yes, a kidney stone can damage the kidney if it blocks urine flow, causes infection, affects a single functioning kidney, blocks both kidneys, or remains untreated for a long time. The good news is that most kidney stones do not cause permanent kidney damage when diagnosed and treated at the right time. A small stone may pass naturally, but a stone stuck in the ureter can cause kidney swelling, severe pain, infection, reduced kidney function and, rarely, long-term kidney damage. Fever with stone pain is an emergency.

Can kidney stone damage the kidney?

A kidney stone can damage the kidney mainly when it causes obstruction. Obstruction means the stone blocks the normal flow of urine from the kidney to the bladder.

Think of the kidney like a water filter with an outlet pipe. If the outlet pipe is blocked, pressure builds up inside the filter. Short-term pressure may recover after the blockage is removed. But long-term pressure can weaken the filter.

When urine cannot drain properly, pressure builds up inside the kidney. This swelling is called hydronephrosis.

The key question is not only, “Is there a stone?” The more important question is: Is the stone blocking the kidney or causing infection?

Does every kidney stone damage the kidney?

No. Many kidney stones do not damage the kidney.

A small stone that passes naturally may cause severe pain but may not leave permanent damage. A stone sitting inside the kidney without blockage may also remain silent for a long time.

But “silent” does not always mean harmless. Some stones slowly grow, block urine flow, or cause repeated infections. This is why a kidney stone found on ultrasound or CT scan should be reviewed properly, even if pain is less.

The risk of kidney damage depends on:

  • Stone size.
  • Stone location.
  • Whether urine flow is blocked.
  • Whether infection is present.
  • Whether one or both kidneys are affected.
  • Kidney function on blood test.
  • Duration of obstruction.
  • Previous stone history.
  • Diabetes, low immunity or chronic kidney disease.

Can a kidney stone damage the kidney without pain?

Yes. A kidney stone can sometimes damage the kidney without severe pain.

This may happen when obstruction develops slowly, when the kidney becomes used to pressure, or when mild repeated pain is ignored. Some patients discover kidney swelling only during ultrasound done for another reason.

This is important because pain relief does not always mean the stone has passed. Painkiller tablets or injections may reduce pain temporarily, but the stone may still be stuck. Follow-up imaging may be needed to confirm that the blockage has cleared.

How does a kidney stone damage the kidney?

1. By blocking urine flow

A stone may form inside the kidney and remain silent. The problem usually starts when it moves into the ureter — the narrow tube carrying urine from the kidney to the bladder.

If the stone gets stuck, urine collects behind it. This causes kidney swelling and pressure buildup. If the blockage is relieved early, kidney function often recovers well. If the blockage continues for a long time, the kidney may slowly lose function.

2. By causing infection behind a blockage

This is the most dangerous situation.

If bacteria infect urine trapped behind an obstructing stone, the infection cannot drain properly. This can lead to pus in the kidney, sepsis, low blood pressure and kidney failure.

3. By affecting a single functioning kidney

A stone is more serious if the patient has only one functioning kidney. In this situation, blockage can affect the body’s total kidney function more quickly.

Patients with a single kidney should not wait at home with repeated injections, home remedies or only painkillers.

4. By blocking both kidneys

If stones block both kidneys, urine output can reduce and creatinine can rise. This needs urgent evaluation.

5. By recurring again and again

One stone episode may not permanently damage the kidney. But repeated stones, repeated infections, untreated obstruction, large stones or staghorn stones can gradually affect kidney health.

This is why stone prevention is important after the acute episode is treated.

In simple words:Stone pain + fever = emergency until proven otherwise.

How serious is your stone situation?

Situation Kidney damage risk
Small stone, no fever, no swelling, normal creatinine Usually low risk with follow-up
Stone with mild hydronephrosis Needs urology review
Stone with severe pain and vomiting Needs early treatment decision
Stone with fever or chills Emergency
Stone with high creatinine Serious
Stone in a single functioning kidney Serious
Stones blocking both kidneys Emergency
Silent stone with hydronephrosis Can be dangerous if ignored
Recurrent stones and infections Long-term risk

Warning signs that a kidney stone may be harming the kidney

Seek urgent medical care if you have kidney stone pain with:

  • Fever or chills.
  • Severe flank pain that is not settling.
  • Persistent vomiting.
  • Burning urination with fever.
  • Very little urine.
  • Inability to pass urine.
  • Drowsiness, weakness or confusion.
  • Known single kidney.
  • Known kidney failure or high creatinine.
  • Diabetes or low immunity.
  • Pregnancy.

These symptoms need medical evaluation because a blocked kidney with infection can become serious quickly.

What is hydronephrosis due to kidney stone?

Hydronephrosis means swelling of the kidney because urine is not draining normally.

In stone disease, hydronephrosis usually happens when a stone blocks the ureter. Mild hydronephrosis may improve after the stone passes. Moderate or severe hydronephrosis needs careful evaluation, especially if pain, fever, vomiting or abnormal kidney function is present.

Hydronephrosis is not the final diagnosis. It is a warning sign. The urologist must find the cause and decide whether the kidney needs observation, medicines, drainage or stone removal.

Can kidney damage from stone be reversed?

Often, yes — if treated early.

If obstruction is relieved in time, kidney swelling reduces and function may recover. But recovery depends on how long the kidney was blocked, whether infection was present, whether kidney function was already weak, whether one or both kidneys were affected, and whether the stone problem keeps recurring.

Long-standing silent obstruction can sometimes lead to permanent loss of function in that kidney. This is why repeated pain, fever, urine infection, hydronephrosis or stones found on ultrasound should not be ignored.

Tests to check if a stone is damaging the kidney

Urine routine and microscopy

This can show blood cells, pus cells, crystals or signs of infection.

Urine culture

This helps detect bacterial infection and choose the correct antibiotic when infection is suspected.

Serum creatinine and eGFR

These blood tests estimate kidney function. Rising creatinine can suggest that the obstruction is affecting overall kidney function.

CBC

A complete blood count may be advised if fever or infection is suspected.

Ultrasound KUB

Ultrasound can show kidney swelling, larger stones, bladder urine retention and sometimes ureteric obstruction.

CT KUB

A non-contrast CT KUB is often the most accurate test to identify stone size, location, number, density and degree of obstruction.

Renal functional scan

In selected cases, especially when one kidney looks badly affected, a nuclear renal scan may be advised to estimate how much that kidney is functioning.

Treatment: how doctors protect the kidney

Treatment depends on whether the stone is simply painful, obstructing, infected or affecting kidney function.

The urologist decides based on:

  • Stone size.
  • Stone location.
  • Degree of hydronephrosis.
  • Fever or infection.
  • Creatinine level.
  • Pain control.
  • Vomiting or dehydration.
  • Single kidney or both kidneys affected.
  • Chances of natural stone passage.

Observation and medicines

Small stones without fever, severe obstruction or kidney function problems may be managed with pain control, hydration guidance and medicines that may help stone passage. This should be done with follow-up. It should not become weeks of repeated painkiller injections without checking whether the stone has passed.

DJ stent

A DJ stent is a soft internal tube placed from the kidney to the bladder. It bypasses the blockage and allows urine to drain. It may be used when there is obstruction, infection risk, kidney swelling, rising creatinine or when the patient needs stabilization before definitive stone treatment.

Percutaneous nephrostomy

A percutaneous nephrostomy is a tube placed through the back directly into the kidney to drain infected or obstructed urine. This may be lifesaving in an infected obstructed kidney.

Stone removal procedures

Depending on stone size and location, procedures may include URSL for ureteric stones, RIRS for kidney stones using a flexible scope and laser, PCNL for large kidney stones, Mini-PCNL for selected kidney stones, and ESWL for selected stones using shock waves. The aim is not just pain relief. The aim is to clear obstruction, control infection risk, preserve kidney function and prevent recurrence.

What should you not do?

Avoid these common mistakes:

  • Do not assume pain relief means the stone has passed.
  • Do not take repeated painkiller injections without follow-up imaging.
  • Do not ignore fever with stone pain.
  • Do not force excessive water during severe pain or vomiting.
  • Do not delay care if you have one kidney or high creatinine.
  • Do not self-medicate with antibiotics without proper evaluation.
  • Do not ignore a “silent” stone found on ultrasound.

When should you see a urologist?

You should see a urologist if:

  • Pain is severe or recurring.
  • Ultrasound shows hydronephrosis.
  • CT shows a ureteric stone.
  • Stone is larger than 5-6 mm.
  • There is fever, chills or urine infection.
  • Creatinine is high.
  • You have a single kidney.
  • You have repeated stone episodes.
  • Stone has not passed despite medicines.
  • You have blood in urine.

Early evaluation helps decide whether the stone can be observed safely or needs intervention.

What to bring for consultation

Bring these reports if available:

  • USG KUB report and images.
  • CT KUB report and film/CD.
  • Urine routine and microscopy.
  • Urine culture report.
  • Serum creatinine/eGFR.
  • CBC if fever or infection was present.
  • Previous stone analysis report.
  • Previous surgery or DJ stent records.
  • Current medicines.
  • Discharge summaries from previous admissions.

FAQs

1. Can kidney stone damage the kidney permanently?

Yes, but this is uncommon when stones are treated at the right time. Permanent damage is more likely when a stone causes long-standing blockage, infection behind obstruction, recurrent infections, high creatinine or obstruction in a single functioning kidney.

2. Can a kidney stone damage the kidney without pain?

Yes. Some stones can silently block urine flow or cause hydronephrosis without severe pain. A painless stone found on ultrasound should still be evaluated.

3. Does pain stopping mean the stone has passed?

Not always. Pain can reduce even when the stone is still stuck. Follow-up ultrasound or CT may be needed to confirm stone passage and check kidney swelling.

4. Is hydronephrosis from a stone dangerous?

Hydronephrosis means urine is backing up into the kidney. Mild swelling may settle after stone passage, but moderate or severe hydronephrosis needs urology evaluation. Hydronephrosis with fever is an emergency.

5. Can kidney function return after stone removal?

Often, kidney function improves after relieving the blockage, especially when treated early. Long-standing obstruction or infection may cause permanent damage.

6. Can kidney stones cause kidney failure?

Rarely, yes. Kidney failure risk is higher when both kidneys are blocked, a single functioning kidney is blocked, infection is present, or the patient already has kidney disease.

7. Is fever with kidney stone dangerous?

Yes. Fever with kidney stone pain can mean infection behind a blockage. This needs urgent medical care and may require emergency drainage with a DJ stent or nephrostomy.

8. Should I drink lots of water during severe kidney stone pain?

Do not force excessive water during severe colic, vomiting or obstruction. Normal hydration is reasonable, but severe pain, vomiting or fever needs medical evaluation rather than only home remedies.

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.