Pregnancy Induced Hypertension (PIH) is a condition in which vasospasms occur during pregnancy in both small and large arteries. Signs of hypertension, proteinuria, and edema develop. It is unique to pregnancy and occurs in 5% to 7% of pregnancies in the united states. Despite years of research, the cause of the disorder is still unknown. Originally it was called toxemia because researchers pictured a toxin of some kind being produced by a women in response to foreign protein of the growing fetus, the toxin leading to the topical symptoms. No such toxins have ever been identified.
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