Retrospective evaluation was applied to 162 pregnancies of women with hypertension at the Third Municipal Hospital of Sofia, Department of Obstetrics and Gynaecology, for a period between 1976 and 1980. The birth record in that period amounted to 9348. Hypertension was recorded from 1.7 per cent of the deliveries. All women examined were primiparae. They were subdivided by four groups: essential hypertension, organic hypertension, EPH gestosis, and plug gestosis. Sixty-two patients with an earlier record of EPH gestosis were additionally examined in a follow-up programme, between 1977 and 1980. Most of the hypertension cases were identified as having been different from EPH gestosis. An attempt is made to group hypertension during pregnancy. The authors suggest that higher accuracy of diagnosis will help to reduce the incidence of both essential hypertension and EPH gestosis. An analysis was made of diagnostic and therapeutic approaches, control of labour, and condition of the newborns.