Renal Papillary Necrosis: Symptoms, Causes, Diagnosis, and Management

3 days ago

6 min read

Updated: 2 days ago

Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: September 2026

TL;DR: Renal papillary necrosis is a condition where the renal papillae—small, cone-shaped structures in the kidney—suffer tissue death due to reduced blood flow. Often triggered by diabetes, sickle cell disease, or long-term use of pain relievers, it can lead to severe pain, urinary tract infections, and chronic kidney disease. While early stages are often silent, management focuses on hydration, treating underlying causes, and occasionally surgery to clear blockages.

Quick Answer

What is renal papillary necrosis? Renal papillary necrosis (RPN) occurs when the renal papillae, which are critical for draining urine into the bladder, do not receive enough blood. This lack of oxygen causes the tissue to die (necrosis). The dead tissue can then break off and block the urinary tract, leading to symptoms like severe back pain, blood in the urine, or fever. It is most commonly associated with chronic conditions like diabetes or the overuse of certain over-the-counter pain medications.

What is Renal Papillary Necrosis?

Renal papillary necrosis is a localized form of kidney damage that affects the renal papillae. These are the points where the collecting ducts in the kidney empty into the ureters. When blood flow to these specific areas is restricted, the tissue begins to die. This condition can affect just one kidney or both simultaneously.

Once the tissue dies, it may slough off—meaning it detaches and enters the urinary tract. This can cause significant physical blockages, similar to kidney stones, and increases the risk of serious infections.

Medical illustration of the kidney showing the cortex, medulla, renal pelvis, and ureter, with restricted blood flow causing necrosis of the renal papillae and sloughed tissue entering the ureter. — The internal structure of the kidney and how restricted blood flow leads to death of the renal papillae.

Symptoms and Clinical Signs

In many cases, renal papillary necrosis does not cause symptoms during its early stages. As the tissue damage worsens or sloughed tissue begins to move through the urinary system, several noticeable signs may emerge.

Symptom Category	Specific Signs
Urinary Changes	Pain when peeing, frequent nighttime urination, or pus/blood in the urine.
Physical Pain	Severe pain on either side of the back, often between the ribs and hips.
Systemic Signs	Fever, chills, and recurring urinary tract infections (UTIs).
Tissue Passage	Small pieces of dead kidney tissue may be visible in the urine.

If you notice blood or visible tissue in your urine, or experience sudden, severe back pain, you should contact a healthcare professional immediately.

Causes and Risk Factors

The primary driver of renal papillary necrosis is a lack of adequate blood supply to the kidney's internal structures. Several chronic conditions and lifestyle factors significantly increase this risk.

Common Triggers

Diabetes: High blood sugar can damage the small blood vessels in the kidneys over time.
Sickle Cell Disease: The abnormally shaped red blood cells can block blood flow to the renal papillae.
Analgesic Overuse: Long-term, high-dose use of pain relievers, including nonsteroidal anti-inflammatory drugs (NSAIDs) like aspirin, ibuprofen, and naproxen, as well as acetaminophen, can be toxic to the kidneys.

Other Contributing Factors

Additional risks include chronic liver disease, severe kidney infections (pyelonephritis), urinary tract blockages, and blood vessel inflammation (vasculitis). Blood clots in the kidney's blood vessels or infections like tuberculosis can also trigger tissue death.

Infographic of renal papillary necrosis triggers, including diabetes, sickle cell disease, and long-term NSAID use, alongside prevention tips such as staying hydrated and regular medical monitoring. — Main triggers of renal papillary necrosis and practical prevention steps such as hydration and regular monitoring.

Diagnosis and Diagnostic Testing

Diagnosing renal papillary necrosis early can be challenging because symptoms are often absent until significant damage has occurred. Providers use a combination of laboratory and imaging tests to confirm the condition.

Urinalysis: Tests the urine for blood, pus, or sloughed tissue fragments.
Blood Tests: Measures kidney function and checks for signs of infection.
Imaging: CT scans and fluoroscopy (moving X-ray images) help visualize blockages and structural changes in the urinary tract.
Ureteroscopy: A thin tube with a camera is used to look directly inside the kidneys and ureters.
Kidney Biopsy: In some cases, a small sample of tissue is removed and examined under a microscope.

Management and Treatment Pathways

There is no single "cure" for renal papillary necrosis; instead, treatment focuses on managing symptoms, preventing further damage, and addressing the underlying cause.

Medical and Surgical Interventions

Hydration: Increasing fluid intake helps flush the urinary tract and maintain blood flow.
Antibiotics: Used to treat and prevent secondary urinary tract infections.
Surgery: If sloughed tissue causes a major blockage, surgical intervention may be necessary to clear the pathway.
Advanced Care: In severe cases where kidney failure occurs, dialysis or a kidney transplant may be required.

Long-Term Management

Managing the root cause—such as controlling blood sugar in diabetes or managing sickle cell symptoms—is the most effective way to slow the progression of the disease.

Four-step management and recovery roadmap for renal papillary necrosis: diagnosis with imaging and tests, acute care with hydration and antibiotics, surgical clearance if needed, and long-term monitoring. — A roadmap for managing renal papillary necrosis, from diagnosis and acute care to long-term monitoring.

Conclusion and Next Steps

Renal papillary necrosis is a serious condition that requires proactive management to prevent permanent kidney damage. By controlling underlying health issues and staying properly hydrated, you can significantly reduce your risk. If you have been diagnosed with diabetes or sickle cell disease, or if you regularly use pain medications, talk to your healthcare provider about monitoring your kidney health.

Immediate Actions:

Monitor your urine for any changes in color, clarity, or the presence of tissue.
Stay hydrated by drinking plenty of water throughout the day.
Discuss medication use with your doctor, especially if you take NSAIDs daily.

For more patient information, visit the National Kidney Foundation, the American Society of Nephrology, and the National Institute of Diabetes and Digestive and Kidney Diseases.

Frequently Asked Questions

Can renal papillary necrosis lead to kidney failure?

Yes, if left untreated, the cumulative damage to the kidney tissue can lead to chronic kidney disease (CKD) and eventually kidney failure.

Is the tissue death permanent?

Yes, once the tissue in the renal papillae dies, it cannot regenerate. However, treatment can prevent further tissue death.

How is this different from a kidney stone?

While both can cause severe pain and blockages, kidney stones are mineral deposits, whereas RPN involves the death and sloughing of actual kidney tissue.

Can children get renal papillary necrosis?

Yes, especially children with sickle cell disease, though it is more commonly diagnosed in adults with long-term diabetes.

Does it always affect both kidneys?

No, it can affect one kidney or both, depending on the underlying cause and blood flow patterns.

What does the "tissue" in the urine look like?

It often appears as small, grayish or reddish-brown fragments or "sloughs" that may be mistaken for blood clots.

Can I continue taking ibuprofen if I have this?

Healthcare providers typically recommend avoiding NSAIDs (like ibuprofen) as they can worsen kidney damage. Always consult your doctor for alternatives.

Is renal papillary necrosis a type of cancer?

No, it is not cancer. However, chronic RPN can increase the risk of developing transitional cell cancer in the urinary tract.

How long does recovery take after a flare-up?

Recovery depends on the extent of the damage and how well the underlying cause is managed. Some function may improve with proper treatment.

Is fever a common symptom?

Fever usually indicates that an infection (like a UTI) has developed as a complication of the tissue death and blockage.

Can sickle cell trait cause this?

Yes, even the sickle cell trait (not just the full disease) has been linked to an increased risk of renal papillary necrosis.

How does diabetes cause RPN?

Diabetes causes "microvascular" damage, meaning it harms the tiny blood vessels that supply the renal papillae, leading to oxygen deprivation.

What is a ureteroscopy?

It is a procedure where a doctor uses a small camera to look inside the ureter and kidney to find blockages or damaged tissue.

Can I prevent RPN?

The best prevention is staying hydrated and managing conditions like diabetes and sickle cell disease effectively.

When should I see a specialist?

If you have chronic kidney issues, diabetes, or sickle cell disease and experience new urinary symptoms or back pain, you should see a nephrologist (kidney specialist).

Medical Disclaimer: This information is for educational purposes only and does not constitute medical advice. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read here.