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Living with IgG4-related retroperitoneal fibrosis

A condition with inflammation and scar tissue at the back of the abdomen that can block blood vessels and urine flow.

Understanding IgG4-related retroperitoneal fibrosis

IgG4-related retroperitoneal fibrosis is a disorder with inflammation and heavy scar tissue (fibrosis) in the back of the abdomen, behind the lining that surrounds the digestive organs.

It most often appears between ages 40 and 60. The scarring often starts around the aorta and can block blood flow in the lower body. It can also block the ureters, the tubes that carry urine from the kidneys.

Signs & symptoms

Symptoms vary from person to person. GARD lists these among the most common:

  • Slowly increasing pain in the lower abdomen, back, or side
  • Loss of appetite
  • Tiredness (fatigue)
  • High blood pressure
  • Swollen kidney from blocked urine flow (hydronephrosis)
  • Swelling or color change in the legs

Not everyone has every symptom. GARD's list comes from the Human Phenotype Ontology.

Diagnosis

  1. Talk with your doctor

    Share the symptoms you've noticed, when they started and your family health history. Notes and photos can help.

  2. See a specialist

    Specialists who may be involved include autoimmune and inflammatory disease specialists.

  3. Ask which tests can help

    Your care team will decide which exams and tests can confirm the diagnosis.

  4. Connect with expert centers

    Autoimmune Association may keep lists of experts for this condition.

Care & treatment

Care team
autoimmune and inflammatory disease specialists (rheumatologists)
Expert care
Expert lists: Autoimmune Association
Treatment
GARD doesn't list specific treatments for this condition. Your care team will tailor care to your symptoms.
Research
Clinical trials and observational studies may be options. See the research section below.

General information, not medical advice. Your care team makes the decisions.

Everyday life

Living with a rare condition is easier with support.

  • Connect with Autoimmune Association and other patient organizations
  • Keep notes on symptoms, changes and questions for appointments
  • Ask about patient registries that help research
  • Look into financial aid and travel resources for care visits
Bring these questions to your next doctor visit
How will we check that my kidneys and ureters aren't blocked?
What imaging do I need to follow the fibrosis?
Which symptoms in my legs or belly should I report right away?

Quick facts

Symptoms usually startAdult

GARD doesn't describe a specific cause here. Scar tissue forms around blood vessels and other structures in the back of the abdomen.

Also known as: idiopathic retroperitoneal fibrosis; ormond disease; ormond's disease; retroperitoneal fibrosis; rpf - retroperitoneal fibrosis; sclerosing retroperitonitis

Patient organizations

Source: NIH GARD · IgG4-related retroperitoneal fibrosisGARD ID 9568 · GARD page updated September 2026 · Plain-language summary by Know Rare; editorial review pending. General information, not medical advice.

You are more than your diagnosis

Perspectives from people navigating life with IgG4-related retroperitoneal fibrosis.

Explore the IgG4-related retroperitoneal fibrosis blog

Explore research for IgG4-related retroperitoneal fibrosis

Explore actively recruiting IgG4-related retroperitoneal fibrosis studies with HealthSpark.

HealthSpark

Find actively recruiting studies for IgG4-related retroperitoneal fibrosis with HealthSpark. Share your city to explore research near you.

  • Recruiting studies from ClinicalTrials.gov
  • Share your city to look for research near you
  • Eligibility is confirmed by the study team

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Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

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