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Living with Langerhans cell histiocytosis

A condition in which extra immune cells called Langerhans cells build up in the body, often forming growths in bones and skin.

Understanding Langerhans cell histiocytosis

Langerhans cell histiocytosis is a disorder in which too many immune cells called Langerhans cells build up in the body.

The extra cells usually form tumors called granulomas. About 80 percent of people have granulomas in the bones, which cause pain and swelling and sometimes fractures. Granulomas also form in the skin as blisters, bumps, or rashes. The pituitary gland may be involved, which can affect puberty and cause diabetes insipidus. In 15 to 20 percent, the lungs, liver, or blood-forming system are involved. Some researchers consider it a form of cancer, though this is debated. It can occur at any time in life.

Signs & symptoms

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

  • Bone pain and swelling
  • Skin rash or bumps
  • Swollen lymph nodes
  • Fever
  • Cough
  • Enlarged liver or spleen

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, blood and bone marrow specialists, cancer specialists and 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

    Histiocytosis Association may keep lists of experts for this condition.

Care & treatment

Care team
autoimmune and inflammatory disease specialists (rheumatologists); Blood and bone marrow specialists (hematologists); Cancer specialists (oncologists); Lung and breathing specialists (pulmonologists)
Expert care
Expert lists: Histiocytosis 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 Histiocytosis Association
  • 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
Which parts of the body are involved in my case?
Is the pituitary gland affected, and does it need hormone checks?
What treatment options are available?

Quick facts

Symptoms usually startany time in life

GARD does not describe a cause for this condition. It involves a buildup of immature Langerhans cells.

RespiratoryBlood

Also known as: differentiated progressive histiocytosis; histiocytosis x; langerhan's cell histiocytosis; langerhans cell disease; langerhans cell granulomatosis; langerhans cell histiocytosis, nos

Patient organizations

Source: NIH GARD · Langerhans cell histiocytosisGARD ID 6858 · 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 Langerhans cell histiocytosis.

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