Background: the current study aimed to investigate healthy and unhealthy behavior among preـeclamptic women. Design A descriptive study design was used in the current study. Setting: The study was conducted at the Ain Shams University Maternity Hospital's Antenatal Clinic. Sample: A purposive sample of 186 pregnant women was enrolled in the study. Tools: two tools were used for data collection; I) A structured interviewing questionnaire, and II) A Healthy and Unhealthy behavior Scale. Results: 66.77% of the study subjects had incorrect total knowledge regarding preeclampsia and 33.3% of them had correct total knowledge regarding preeclampsia. Also, 53.8% of the studied women had unhealthy behavior while 46.2% of the studied women had healthy behavior. Additionally, there was a highly significant positive correlation between the total knowledge of the studied women about pre-eclampsia and their total healthy behavior at (P= < 0.01). Conclusion: More than two-thirds of the study subjects had incorrect total knowledge about pre-eclampsia and one-third of them had correct total knowledge about pre-eclampsia. Additionally, the present study results depicted that more than half of the studied women had unhealthy behavior and less than half of them had healthy behavior. Recommendations: Outreach and rising awareness programs related to knowledge, self-care measures, and health behaviors must be designed and implemented to correct unhealthy behaviors and promote healthy ones among preeclamptic women at outpatient clinic.