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PubMed This is a summary of 46 peer-reviewed journal articles Updated
Hematology · Warm Autoimmune Hemolytic Anemia

Orientation to Warm Autoimmune Hemolytic Anemia (wAIHA)

At a Glance

Warm Autoimmune Hemolytic Anemia (wAIHA) is a rare but highly treatable condition where the immune system mistakenly destroys healthy red blood cells at normal body temperature. It is not cancer, and initial treatment with corticosteroids typically stabilizes blood counts by stopping the immune attack.

Receiving a diagnosis for a rare condition like Warm Autoimmune Hemolytic Anemia (wAIHA) can feel overwhelming and frightening. It is natural to feel a sense of panic when you hear that your immune system is attacking your own blood [1]. However, it is important to take a breath and orient yourself to a few key facts: wAIHA is a well-understood medical condition, it is not cancer, and it is highly treatable with established therapies [1][2].

Understanding the “Warm” in wAIHA

In a healthy body, the immune system protects you from outside invaders like viruses. In wAIHA, the immune system mistakenly identifies your own red blood cells (the cells that carry oxygen) as threats [3].

The immune system produces proteins called antibodies—specifically IgG antibodies—that attach to these red blood cells [1][4]. The term “warm” refers to the fact that these antibodies react best at normal body temperature (98.6°F) [1]. Once these antibodies are attached, the spleen identifies the “marked” blood cells and removes them from circulation prematurely [1][3]. This process is called hemolysis (the breaking down of blood cells).

Stabilizing Facts

While the diagnosis is serious, the following facts often help patients move from a state of panic to a state of management:

  1. It is not cancer: Although wAIHA involves the blood and immune system, it is an autoimmune disorder, not a malignancy [1][5].
  2. It is highly treatable: Most patients respond well to initial treatments. The goal of treatment is to stop the destruction of red blood cells and bring your blood counts back to a safe level [2][6].
  3. You can live a full life: While wAIHA can be a chronic or “relapsing” condition (meaning it may come and go), many patients achieve long periods of remission where the disease is inactive [1][7].

How Rare is wAIHA?

You are not alone, but you are part of a small group. Warm AIHA is the most common form of autoimmune hemolytic anemia in adults, accounting for about 70% to 80% of all cases [1]. Despite being the “most common” form, it is still considered a rare disease, with an incidence rate of approximately 1 to 3 people per 100,000 each year [1].

Because it is rare, you may find that your primary care doctor or local clinic has limited experience with it. It is often beneficial to work with a hematologist (a blood specialist) who is familiar with the latest treatment protocols [1].

What Happens Next?

The first step in your journey is usually stabilizing your red blood cell count. Doctors typically start with corticosteroids (like prednisone), which act as a “reset button” for the immune system to stop the immediate attack [2][8].

As you begin treatment, your care team will also look for any “secondary” causes—meaning other conditions like an infection or another autoimmune disease that might have triggered the wAIHA [9][10]. Identifying a trigger can sometimes help in managing the condition long-term.

Feature Description
Primary Antibody IgG (reacts at body temperature) [1]
Primary Site of Destruction The Spleen [1]
First-Line Treatment Corticosteroids (e.g., Prednisone) [2]
Common Symptoms Fatigue, shortness of breath, paleness, or jaundice [1]

Continue reading:

01

Symptoms & Diagnostic Workup for wAIHA

Learn the symptoms of warm Autoimmune Hemolytic Anemia (wAIHA) and how it is diagnosed. Understand DAT test results, hemolysis markers, and essential lab work.

02

Primary vs. Secondary wAIHA & Related Conditions

Learn the difference between primary and secondary warm autoimmune hemolytic anemia (wAIHA). Understand underlying triggers, Evans syndrome, and look-alikes.

03

Treatment Strategy & Standard of Care for wAIHA

Learn about the standard treatment strategy for warm Autoimmune Hemolytic Anemia (wAIHA), including corticosteroids, rituximab, and emerging therapies.

04

Relapse, Survivorship & Monitoring for wAIHA

Learn how to monitor warm Autoimmune Hemolytic Anemia (wAIHA) for relapse. Understand blood clot risks, managing fatigue, and long-term steroid effects.

Common questions in this guide

Is Warm Autoimmune Hemolytic Anemia a type of cancer?
No, wAIHA is not a type of cancer or malignancy. It is a rare autoimmune disorder in which your immune system gets confused and attacks your own healthy red blood cells instead of protecting you from outside invaders.
What does the word "warm" mean in wAIHA?
The term "warm" refers to the specific type of antibodies (IgG) your immune system is producing. These antibodies react best and attach to your red blood cells at normal body temperature, which is 98.6°F.
How is wAIHA usually treated first?
The first-line treatment typically involves corticosteroids, such as prednisone. These medications act as a quick reset button for your immune system, slowing down or stopping the immediate destruction of your red blood cells.
Can other health conditions cause wAIHA?
Yes, wAIHA can sometimes be triggered by secondary factors. Underlying conditions such as lupus, other autoimmune diseases, or recent viral infections can cause your immune system to mistakenly target your blood cells.
When would I need a blood transfusion for wAIHA?
A blood transfusion may be necessary if your red blood cell count (measured by your hemoglobin level) drops to a dangerously low point, especially if you are experiencing severe fatigue, shortness of breath, or pale skin.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Are there any underlying conditions, such as lupus or a recent infection, that might be triggering my immune system to attack my red blood cells?
  2. 2.What is my current hemoglobin level, and at what point would we consider a blood transfusion?
  3. 3.What is the specific plan for tapering my steroid dose, and what side effects should I look out for?
  4. 4.If the initial treatment doesn't work as expected, what are the next options, such as Rituximab?
  5. 5.Are there any specific activities or environments I should avoid while my red blood cell count is low?

Questions For You

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References

References (10)
  1. 1

    Warm Autoimmune Hemolytic Anemia.

    Brodsky RA

    The New England journal of medicine 2019; (381(7)):647-654 doi:10.1056/NEJMcp1900554.

    PMID: 31412178
  2. 2

    Role of therapeutic plasma exchanges in refractory severe warm autoimmune hemolytic anemia: Presentation of two case reports.

    García-García I, Cid J, Palomino A, et al.

    Transfusion 2020; (60(11)):2753-2757 doi:10.1111/trf.16143.

    PMID: 33089904
  3. 3

    Autoimmune Hemolytic Anemia.

    Liebman HA, Weitz IC

    The Medical clinics of North America 2017; (101(2)):351-359 doi:10.1016/j.mcna.2016.09.007.

    PMID: 28189175
  4. 4

    Clinical severity in adult warm autoimmune hemolytic anemia and its relationship to antibody specificity.

    Chadebech P, Loustau V, Janvier D, et al.

    Haematologica 2018; (103(1)):e35-e38 doi:10.3324/haematol.2017.175976.

    PMID: 29025905
  5. 5

    The Clinical Pictures of Autoimmune Hemolytic Anemia.

    Packman CH

    Transfusion medicine and hemotherapy : offizielles Organ der Deutschen Gesellschaft fur Transfusionsmedizin und Immunhamatologie 2015; (42(5)):317-24 doi:10.1159/000440656.

    PMID: 26696800
  6. 6

    Difficult to swallow: warm autoimmune hemolytic anemia in a Jehovah's Witness treated with hemoglobin concentrate complicated by achalasia.

    Epperla N, Strouse C, VanSandt AM, Foy P

    Transfusion 2016; (56(7)):1801-6 doi:10.1111/trf.13607.

    PMID: 27062564
  7. 7

    Literature review of occurrence, effectiveness, safety, and hospitalization burden of blood transfusion in the management of warm autoimmune hemolytic anemia.

    Barros M, Leon A, Crivera C, et al.

    Hematology (Amsterdam, Netherlands) 2025; (30(1)):2472489 doi:10.1080/16078454.2025.2472489.

    PMID: 40073280
  8. 8

    Diagnosis and treatment of autoimmune hemolytic anemia in adults: Recommendations from the First International Consensus Meeting.

    Jäger U, Barcellini W, Broome CM, et al.

    Blood reviews 2020; (41()):100648 doi:10.1016/j.blre.2019.100648.

    PMID: 31839434
  9. 9

    Warm Autoimmune Hemolytic Anemia Associated With Asymptomatic SARS-CoV-2 Infection.

    Liput JR, Jordan K, Patadia R, Kander E

    Cureus 2021; (13(3)):e14101 doi:10.7759/cureus.14101.

    PMID: 33927918
  10. 10

    Warm Autoimmune Hemolytic Anemia as the Initial Presentation of Systemic Lupus Erythematosus (SLE): A Case Report.

    Kanderi T, Kim J, Chan Gomez J, et al.

    The American journal of case reports 2021; (22()):e932965 doi:10.12659/AJCR.932965.

    PMID: 34897265

This page provides an orientation to Warm Autoimmune Hemolytic Anemia (wAIHA) for educational purposes only. Always consult your hematologist or primary care physician for professional medical advice regarding your specific diagnosis and treatment.

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