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Living with Idiopathic acute eosinophilic pneumonia

A lung condition in which many eosinophils, a type of white blood cell, quickly build up in the lungs.

Understanding Idiopathic acute eosinophilic pneumonia

Idiopathic acute eosinophilic pneumonia (IAEP) is a lung condition with a rapid buildup of eosinophils, a type of immune white blood cell, in the lungs.

"Idiopathic" means the exact cause of the extra eosinophils is not known. Possible triggers include cigarette smoking, dust and smoke at work, and certain medications. Diagnosis generally involves a bronchoscopy and bronchoalveolar lavage (BAL).

Signs & symptoms

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

  • Fever
  • Cough
  • Chest pain
  • Muscle aches (myalgia)
  • Trouble breathing
  • Abdominal pain

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 lung and breathing 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

    American Partnership For Eosinophilic Disorders and Children's Interstitial Lung Disease Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Lung and breathing specialists (pulmonologists)
Expert care
Expert lists: American Partnership For Eosinophilic Disorders, Children's Interstitial Lung Disease 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 American Partnership For Eosinophilic Disorders 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
What tests, such as bronchoscopy, will be needed?
Could smoking or my work exposures be triggers?
Could any of my medications be involved?

Quick facts

Symptoms usually startany time in life

The exact cause is not known. GARD says possible triggers include cigarette smoking, workplace dust and smoke exposure, and certain medications.

Respiratory

Also known as: acute eosinophilic pneumonia; iaep; idiopathic acute eosinophilic pneumonitis; loeffler's pneumonia; loffler syndrome; loffler's syndrome

Patient organizations

Source: NIH GARD · Idiopathic acute eosinophilic pneumoniaGARD ID 519 · 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 Idiopathic acute eosinophilic pneumonia.

Explore the Idiopathic acute eosinophilic pneumonia blog

Explore research for Idiopathic acute eosinophilic pneumonia

Explore actively recruiting Idiopathic acute eosinophilic pneumonia studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Idiopathic acute eosinophilic pneumonia 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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