Even rarer and less understood is HELLP syndrome, in which blood cells break down. HELLP is believed to be a severe form of preeclampsia, but the relationship between the disorders remains controversial.
Any pregnant woman can develop preeclampsia, but experts have identified some risk factors. The American College of Obstetricians and Gynecologists recommends high-risk women take low-dose aspirin, and says women with a few moderate risk factors should consider it.
High risk factors:
Moderate risk factors: