Who is affected by pre-eclampsia and high blood pressure during pregnancy

High blood pressure develops in about 10% of all pregnancies in the United States.1 Of pregnant women with chronic high blood pressure, nearly 1 in 4 develops pre-eclampsia.2

Pre-eclampsia occurs in about 5% of all pregnancies.3 In some populations and environments, higher rates have been reported. Pre-eclampsia most often affects women who:

  • Are pregnant for the first time or have not been pregnant for 10 or more years.4
  • Have a family history of pre-eclampsia. Your risk is greatest if either you or your partner were born from a pregnancy affected by pre-eclampsia.5
  • Are younger than 21 or older than 35.
  • Are more than 20% over their ideal body weight. If your weight is within this range, the higher your pre-pregnancy body mass index, the greater your pre-eclampsia risk.6
  • Do not see their doctors for prenatal checkups regularly.

Less than 1% of women with pre-eclampsia develop seizures (eclampsia).7



Author: Shannon Erstad, MBA/MPH
Carrie Henley
Last Updated: March 15, 2007
Medical Review: Joy Melnikow, MD, MPH - Family Medicine
Anne C. Poinier, MD - Internal Medicine
Gregory A L Davies, MD, FRCSC, FACOG - Maternal-Fetal Medicine
William Gilbert, MD - Perinatology

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