Antiphospholipid syndrome (APS) is an autoimmune disorder. It occurs when your body’s immune system makes antibodies that attack phospholipids (a type of fat found in living cells). The exact reason for this is not known. While APS is not passed through families in a predictable pattern, genetics are thought to play a role.
https://rarediseases.info.nih.gov/diseases/5824/antiphospholipid-syndrome

