These prothrombotic states may be primary inherited disorders or, much more often, secondary to pregnancy, to a haematological, or systemic disease, or to the effects treatment.

• 这些造成血栓形成的因素可能首先来自于遗传因素，而更常见的则是继发于妊娠、血液系统或全身性疾病以及各种药物的影响。