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Living with Felty syndrome

A rare condition with three features: rheumatoid arthritis, an enlarged spleen, and a low white blood cell count that leads to repeated infections.

Understanding Felty syndrome

Felty syndrome is a rare disorder defined by three conditions together: rheumatoid arthritis, an enlarged spleen, and low white blood cells (neutropenia).

The low white blood cell count can cause repeated infections. Some people have no symptoms, while others have serious infections. Other symptoms may include tiredness, fever, weight loss, enlarged liver or lymph nodes, Sjogren syndrome, and leg ulcers. A few family cases have been reported. It usually starts in adulthood.

Signs & symptoms

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

  • Arthritis and joint pain
  • Enlarged spleen (splenomegaly)
  • Low neutrophil count and repeated infections
  • Anemia
  • Lumps under the skin
  • Limited joint movement

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 and allergy and immune system 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); Allergy and immune system specialists (allergists / immunologists)
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 often should my blood counts be checked?
How can I lower my risk of infections?
Which specialists should manage my arthritis and blood counts?

Quick facts

Symptoms usually startAdult
InheritanceAutosomal Dominant

The exact cause is unknown, but several risk factors have been proposed, including autoimmunity. A few family cases have been reported.

Also known as: felty's syndrome; rheumatoid arthritis with splenoadenomegaly and leukopenia; rheumatoid arthritis, leukopenia and splenomegaly; splenomegaly-neutropenia-rheumatoid arthritis syndrome

Patient organizations

Source: NIH GARD · Felty syndromeGARD ID 8234 · 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 Felty syndrome.

Explore the Felty syndrome blog

Explore research for Felty syndrome

Explore actively recruiting Felty syndrome studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Felty syndrome 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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