Retroperitoneal Fibrosis: A Comprehensive Guide
Medically reviewed by Andre Stone | MD, University of Pittsburgh School of Medicine on August 24th, 2026.
Published on April 8th, 2026. Updated on August 28th, 2026.
Key Takeaways
Retroperitoneal fibrosis is a rare condition where thick, fibrous tissue develops behind the abdominal organs
It can block the tubes that carry urine from kidneys to bladder, causing serious kidney problems
Early symptoms include back pain, fatigue, and changes in urination patterns
Most cases have no known cause, but some medications and infections can trigger it
Treatment often involves steroids to reduce inflammation and may require surgery in severe cases
Overview
Retroperitoneal fibrosis is an uncommon disorder that affects the area behind your abdominal organs. This space, called the retroperitoneum, contains important structures like your kidneys, ureters, and major blood vessels. When you have this condition, thick scar tissue forms in this area.
The fibrous tissue can wrap around and squeeze your ureters. These are the thin tubes that carry urine from your kidneys to your bladder. When these tubes get blocked, urine can back up into your kidneys and cause damage.
This condition affects about 1 in 200,000 people each year. It typically develops in adults between ages 40 and 60. Men are slightly more likely to develop it than women. Without proper treatment, it can lead to kidney failure and other serious complications.
The exact cause of this scar tissue forming remains a mystery in most cases. Scientists continue to study why some people develop this condition while others don't. Understanding the cause helps doctors develop better treatments for their patients.
Symptoms & Signs
The symptoms of retroperitoneal fibrosis often develop slowly over weeks or months. Many people don't notice symptoms until the condition is quite advanced.
Primary Symptoms
Back and side pain: Dull, aching pain in your lower back or sides that gets worse over time
Urinary changes: Decreased urine output, painful urination, or blood in urine
Abdominal discomfort: Pain or pressure in your belly area that doesn't go away
Leg swelling: Swelling in one or both legs due to blocked blood vessels
Some people also experience fatigue and feel tired even after resting. Weight loss can happen when the condition affects how your body works. Fever and chills may occur if an infection is involved.
When to Seek Care
Contact your doctor promptly if you have persistent back pain with urinary changes. For emergency warning signs, see “When to Seek Immediate Care.”
Pay close attention to any changes in how much you urinate or the color of your urine. Keep a simple journal to track when pain happens and what makes it better or worse. This information helps your doctor understand your condition better.
When to Seek Immediate Care
Get emergency medical help if you suddenly can't urinate, have severe belly pain, or develop signs of kidney failure like confusion and difficulty breathing.
Causes & Risk Factors
Most cases of retroperitoneal fibrosis happen for unknown reasons. These are called idiopathic cases. However, doctors have identified several factors that can trigger this condition.
Age
Most common in adults aged 40-60 years
Genetics
Family history may increase risk, though genetic links are unclear
Lifestyle
Smoking and certain medication use may contribute to development
Other Conditions
Autoimmune diseases and previous abdominal infections may increase risk
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Diagnosis
Medical History & Physical Examination
Your doctor will ask about your symptoms, medications, and medical history. They'll pay special attention to any back pain, urinary changes, or leg swelling. During the physical exam, they'll check for kidney tenderness and signs of fluid retention.
The doctor will also examine your abdomen for masses or tenderness. They may check your blood pressure and look for signs of kidney problems like swelling in your face or ankles.
Be honest about all medications you take, including over-the-counter drugs and supplements. Tell your doctor if you've ever had radiation therapy or major abdominal surgery. This information helps them determine if your condition has an identifiable cause.
Diagnostic Testing
CT scan or MRI: These imaging tests can show the fibrous tissue and any blockage of your ureters or blood vessels
Blood tests: Check kidney function, inflammation markers, and rule out other conditions that might cause similar symptoms
Urine tests: Look for blood, protein, or signs of infection that might indicate kidney involvement
Biopsy: Sometimes needed to confirm the diagnosis and rule out cancer, though this is less common
Your doctor may order multiple tests to get a complete picture of your condition. Some tests need to be repeated over time to monitor how the disease progresses. Special blood tests can measure inflammation levels in your body, which helps guide treatment decisions.
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Treatment Options
Treatment aims to reduce inflammation, preserve kidney function, and prevent the condition from getting worse. The approach depends on how severe your symptoms are and how much the fibrosis has progressed.
Conservative Treatments
Corticosteroids can reduce inflammation and may improve the tissue around the ureters, especially when inflammation is active.
Immunosuppressive drugs: Medications like methotrexate may help control the immune system's response when steroids alone aren't enough
Ureteral stents: Thin tubes placed inside your ureters to keep them open and allow urine to flow properly to your bladder
Most doctors start with steroid treatment to reduce inflammation and swelling. These medications work by calming down the immune system's response. Many patients improve significantly within the first few months of steroid therapy.
Advanced Treatments
In severe cases, surgery may be used to free the blocked ureters from surrounding tissue and protect kidney drainage.
Kidney drainage procedures: If kidney function is severely affected, temporary drainage tubes may be needed to protect your kidneys
Procedures to relieve ureter blockage may be needed promptly when kidney drainage is threatened, while medication is used to treat the underlying inflammation. Your surgical team will carefully plan the procedure to cause the least damage to healthy tissue. Recovery from surgery takes several weeks, with gradual return to normal activities.
Your doctor will work with you to find the best combination of treatments. Treatment plans are personalized based on how your body responds. Regular follow-up appointments help your doctor make adjustments as needed.
Living with the Condition
Daily Management Strategies
Stay hydrated by drinking plenty of water to help your kidneys function properly. Monitor your symptoms and keep track of any changes in pain levels or urinary patterns. Take medications exactly as prescribed, even if you start feeling better. Follow up regularly with your healthcare team to monitor your kidney function and adjust treatment as needed.
Create a daily routine that includes time for rest and gentle activity. Keep all doctor appointments and lab tests to catch any changes early. Tell your doctor right away if you develop new symptoms or if current symptoms get worse.
Exercise & Movement
Light to moderate exercise like walking can help maintain your overall health and circulation. Avoid heavy lifting or strenuous activities that might strain your back or abdomen. Avoid heavy lifting or strenuous activities that might strain your back or abdomen. Listen to your body and rest when you feel tired or uncomfortable.
Talk to your doctor before starting any new exercise program. Swimming and stretching are often good options for people with this condition. Regular movement helps prevent blood clots and keeps your muscles strong.
Prevention
Avoid unnecessary medications known to cause retroperitoneal fibrosis, and discuss alternatives with your doctor
If you smoke, discuss a cessation plan with your healthcare professional.
Manage autoimmune conditions properly with regular medical care and prescribed treatments
Stay aware of family history and inform doctors about any relatives with similar conditions
Get regular check-ups if you have risk factors like autoimmune diseases or take high-risk medications
Ask your doctor which medications you take might increase your risk. Some alternatives may work just as well without the same risks. Maintaining a healthy weight and managing stress also supports kidney health.
Frequently Asked Questions
While there's no definitive cure, many people respond well to treatment with steroids and other medications. Early diagnosis and proper treatment can stop the condition from getting worse and help preserve kidney function.
Treatment often continues for months or years. Steroid treatment and dose reduction plans vary. Steroid treatment and dose reduction plans vary. Your specialist will base the duration on disease activity, kidney drainage, treatment response, and side effects.
Surgery isn't always necessary. Many people improve with medication alone. Surgery is typically reserved for cases where medications don't work or kidney function is severely threatened. Surgery is typically reserved for cases where medications don't work or kidney function is severely threatened.
Yes, the condition can return after treatment ends. This is why long-term follow-up with your healthcare team is important. Regular monitoring helps catch any recurrence early when it's easier to treat.
With proper treatment, most people maintain good kidney function. However, delayed diagnosis or severe cases can lead to permanent kidney damage. Early diagnosis and treatment can help preserve kidney function.
Still have questions?
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