I studied levels of blood pressure on 120 healthy primigravides aged between 22-40 years during physiological pregnancy. Blood pressure had been taken by standard methods (mercury sphygmomanometer). 60 of these women had a positive family history of hypertension and 60 pregnancies were with no family history of hypertension. Phase I of Korotkoff sound was used as the ausculatory criterion of systolic blood pressure and phase V was used as the criterion of diastolic blood pressure. The group of healthy pregnant women with a positive family history of hypertension presented statistically significantly higher values of systolic as well as diastolic blood pressure than the group of pregnancies with no family history of hypertension. The lowest systolic value has shown in the 6th month, diastolic in the 5th month of pregnancy and the highest values of both-were determined in the 9th month of pregnancy CONCLUSIONS Hypertension during pregnancy of healthy women is strongly influenced by their positive family history of hypertension.