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Living with Selective IgM deficiency

A rare immune condition with little or no IgM antibody, which can lead to repeated infections.

Understanding Selective IgM deficiency

Selective IgM deficiency is a rare immune condition in which a person has no or too little IgM antibody but normal IgG and IgA.

IgM is the first antibody the body makes against a new infection, so low IgM can make fighting infections harder. It can occur in infants, children, or adults. It may occur on its own or alongside other conditions, such as autoimmune, allergic, or digestive diseases. Some people have no symptoms specific to it and are found while being checked for something else.

Signs & symptoms

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

  • Repeated infections
  • Repeated sinus infections
  • Repeated pneumonia
  • Repeated colds and chest infections
  • Allergies
  • Autoimmune conditions

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 allergy and immune system specialists and genetic 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

    Immune Deficiency Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Allergy and immune system specialists (allergists / immunologists); Genetic specialists (geneticists)
Expert care
Expert lists: Immune Deficiency Foundation
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 Jeffrey Modell Foundation 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
Do I have another condition that could be causing low IgM?
How can we lower the number of infections?
Do I need other immune tests or vaccines?

Quick facts

Symptoms usually startany time in life

GARD says the cause is still unclear. It usually occurs in only one person in a family, though some families are reported. It may occur with chromosome conditions such as 22q11.2 deletion syndrome.

Genetic

Also known as: selective igm deficiency disease; selective igm immunodeficiency; selective immunoglobulin m deficiency

Patient organizations

Source: NIH GARD · Selective IgM deficiencyGARD ID 12547 · 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 Selective IgM deficiency.

Explore the Selective IgM deficiency blog

Explore research for Selective IgM deficiency

Explore actively recruiting Selective IgM deficiency studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Selective IgM deficiency 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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