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Objective To investigate the effect of pre-pregnant obesity and gestational weight gain (GWG) on hypertensive disorders of pregnancy.Methods Pre-pregnancy body mass index (BMI) was calculated as predicted pre-pregnancy weight (kilograms)/self-reported height (meters) squared and classified according to the World Health Organization categories.Results Greater pre-pregnancy weight was associated with an increased risk of gestational hypertension and preeclampsia per 11 kg of pre-pregnancy weight: odds ratio (OR), 1.90;95% confidence interval (CI), 1.70-1.91 and OR, 1.71;95% CI, 1.49-1.95, respectively, In all gestational periods, GWG was positively associated with blood pressure change.Conclusion These findings suggest that pre-pregnant obesity and GWG with pregnancy may be a potential target for interventions aimed at reducing the risk of hypertensive disorders of pregnancy.