Fluid changes: During pregnancy there are great increases in the the volume of blood and other fluids in the body along with the increased weight. Dilitation of the blood vessels, at least in part due to the tremendous surge in hormones, allows the body to accomodate this increased volume without an increased pressure. In some woman this dilitation is not enough, vasoconstiction occurs and pressure rises.
Answered 11/26/2013
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Often?: It is not common but can be a serious problem for mom & fetus with close follow up & treatment required.
Answered 6/1/2013
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