Antiphospholipid syndrome is an autoimmune condition where antibodies attack a component of cell membranes. This leads to clotting in both arteries and veins which usually lead to further complications such as deep-vein thrombosis or stroke as well as infarctions in the smaller blood vessels. In pregnant women, it can lead to serious complications with the fetus and often results in preeclampsia, miscarriage or stillbirth. In severe cases, the clots can lead to widespread organ damage and death.