Introduction: Preeclampsia is a progressive multisystem hypertensive disorder carries life-threating condition for mother and fetus. Lifestyle modification is an appropriate guideline to alleviate the signs and symptoms of mild preeclampsia. Objectives: This study aimed to assess the effectiveness of educational intervention on lifestyle modification on improving signs and symptoms of mild preeclampsia. Methods: A Quasi-experimental design was conducted on a purposive sample of 80 pregnant women with mild preeclampsia, they were assigned into two groups; the study group received session of health education about appropriate lifestyle modification for mild preeclampsia and followed the guidelines alongside the hospital treatment protocol, while the control group followed the hospital pharmacological treatment protocol. Participants in both groups were followed-up every two weeks until 36th weeks of gestation, then weekly until delivery. Results: Educational intervention on lifestyle modification improves the signs and symptoms and lowers the risk of severe preeclampsia. Conclusion: Lifestyle modification is an effective strategy in the management mild preeclampsia, and it is recommended to be added in hospitals’ protocols.