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Living with Primary myelofibrosis

A blood condition in which scar tissue builds up in the bone marrow so it cannot make enough healthy blood cells, mostly diagnosed from age 50 to 80.

Understanding Primary myelofibrosis

Primary myelofibrosis is a condition in which scar tissue (fibrosis) builds up in the bone marrow, the tissue that makes blood cells.

Most people have no symptoms at first. Later there can be too few red blood cells, white blood cells and platelets. Anemia can cause extreme tiredness or breathlessness, fewer white cells can cause more infections, and fewer platelets can cause easy bruising or bleeding. The spleen and liver may begin to make blood cells and become enlarged. It is most commonly diagnosed in people aged 50 to 80.

Signs & symptoms

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

  • Tiredness (fatigue) and shortness of breath
  • Low red blood cells (anemia)
  • Low platelets and easy bruising
  • Enlarged spleen or liver
  • Fever, night sweats and bone pain
  • Pale skin

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 blood and bone marrow specialists and cancer 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

    Aplastic Anemia and MDS International Foundation may keep lists of experts for this condition.

Care & treatment

Care team
Blood and bone marrow specialists (hematologists); Cancer specialists (oncologists)
Expert care
Expert lists: Aplastic Anemia and MDS International 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 Aplastic Anemia and MDS International 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
What tests show how advanced my myelofibrosis is?
What treatments are available for anemia and an enlarged spleen?
How often should my blood counts be checked?

Quick facts

Symptoms usually startAdult

GARD describes how scar tissue in the bone marrow disrupts blood cell making. It doesn't describe a cause for this condition yet.

Blood

Also known as: agnogenic myeloid metaplasia; aleukemic myelosis; amm; bone marrow fibrosis; chronic idiopathic myelofibrosis; cimf

Patient organizations

Source: NIH GARD · Primary myelofibrosisGARD ID 8618 · 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 Primary myelofibrosis.

Explore the Primary myelofibrosis blog

Explore research for Primary myelofibrosis

Explore actively recruiting Primary myelofibrosis studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Primary myelofibrosis 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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