Overview
APS is often found after an unexplained clot or several miscarriages.
It can happen alone or with lupus.
Symptoms
Common signs:
- Blood clots
Less common
- Pregnancy loss
- Stroke
When to get medical care
Causes
Immune.
Does it spread or run in families?
- It isn't contagious. You can't catch it from someone else.
Who is more likely to get it
- Lupus
Possible complications
- Stroke: From blood clots
- Pregnancy loss (miscarriage): Repeat losses are common without treatment
Diagnosis
A clinician asks about your symptoms and may order tests.
The exam
A physical exam.
Tests
Tests, if needed:
- Antibody tests:
Treatment
Treatment depends on the cause and how severe it is.
Self-care
- Take blood thinners
- Don't smoke
Prevention
To lower your risk or prevent problems:
- Don't smoke
Which doctor treats this
- Start with your primary care provider (family doctor or internist).
- They may send you to a rheumatologist (joint and immune system doctor).
Living with it
Support groups and helplines
- Genetic and Rare Diseases Information Center (GARD): Free NIH information on rare diseases, including where to find experts and patient groups.
- National Organization for Rare Disorders (NORD): Patient groups, help finding care, and aid programs for rare diseases.
Children, pregnancy, and older adults
- Pregnancy: Needs special care with blood thinners.
Pregnancy and breastfeeding
- If you're pregnant or planning to be, tell your prenatal provider about this condition.
- Don't start or stop any medicine on your own. Some are safe in pregnancy and some need to be changed.
- Ask before taking any pain reliever. The FDA advises avoiding ibuprofen and naproxen after 20 weeks unless your doctor says to.
- Breastfeeding: Most medicines are fine, but ask. The NIH LactMed database lists what's known about each one.
Outlook
Treatment lowers clot risk.
Blood thinners help.
Getting ready for your visit
Bring a list of your symptoms and medicines.
What to bring
- A list of your medicines and supplements
- Notes on when symptoms started and what makes them better or worse
Questions to ask
- What's causing this?
- What treatment do you recommend?
- How long will I take blood thinners?
Research studies
Research studies test new ways to find and treat health problems. Some are looking for volunteers. Talk with your doctor before joining one.
Search ClinicalTrials.gov for studies on Antiphospholipid syndrome
Sources
Last updated 2026-11-12.