Skip to content
knowrare
HealthSignal
Your condition community

Living with Catastrophic antiphospholipid syndrome

A rare autoimmune condition in which blood clots form in several organs at once or within a week.

Understanding Catastrophic antiphospholipid syndrome

Catastrophic antiphospholipid syndrome is a rare autoimmune disease with sudden blood clots in three or more organs, either at once or within a week.

It occurs along with antiphospholipid antibodies in the blood. Doctors also confirm that small blood vessels are blocked in at least one affected organ. It is often triggered by infection, trauma, or surgery. It usually affects adults.

Signs & symptoms

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

  • Abnormal blood clots
  • Blood clots in deep veins
  • Blood clots in arteries
  • Anemia from broken-down red blood cells (hemolytic anemia)
  • Joint pain (arthralgia)

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 and blood and bone marrow 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

    APS Foundation of America, Inc. and Autoimmune 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)
Expert care
Expert lists: APS Foundation of America, Inc., Autoimmune 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 APS Foundation of America, Inc. 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
Which tests can show antiphospholipid antibodies?
How can I lower the chance of another episode?
Which specialists should be on my care team?

Quick facts

Symptoms usually startAdult

GARD says the condition is autoimmune and happens with antiphospholipid antibodies in the blood. It is often triggered by infection, trauma, or surgery.

Blood

Also known as: asherson's syndrome; caps; catastrophic aps

Patient organizations

Source: NIH GARD · Catastrophic antiphospholipid syndromeGARD ID 9820 · 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 Catastrophic antiphospholipid syndrome.

Explore the Catastrophic antiphospholipid syndrome blog

Explore research for Catastrophic antiphospholipid syndrome

Explore actively recruiting Catastrophic antiphospholipid syndrome studies with HealthSpark.

HealthSpark

Find actively recruiting studies for Catastrophic antiphospholipid syndrome 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

Powered by HealthSpark, our AI chat helper

I can help you find recruiting Catastrophic antiphospholipid syndrome studies. Enter a ZIP code, address or city below and I'll look within 50 miles.

Powered by HealthSpark, our AI chat helper · Study information from ClinicalTrials.gov · Eligibility is confirmed by the study team.

Get Signals for Catastrophic antiphospholipid syndrome

Stay in the loop with community stories and updates from medical researchers.

HealthStoryfor Catastrophic antiphospholipid syndrome

Create a living journal that talks back

HealthStory evolves private journaling with a living AI journal that talks back and asks thoughtful questions, helping you capture your Catastrophic antiphospholipid syndrome experiences more deeply and prepare for better conversations with your doctors and care team.

Start your journal

Your journal is private. Sharing your story publicly is a separate choice, made with Share your story above.