Iron deficiency is the most common cause of postpartum anemia due to food habits, insufficient maternal iron reserves at the beginning of pregnancy, in-creased iron requirements associated with pregnancy, and blood loss during childbirth. As a non-drug treatment the use of hyperbaric oxygen therapy (HBO) is proposed. The main essence of the action of HBO is reduced to a rapid in-crease in oxygen tension in tissues due to an increase in the amount of dissolved oxygen in the blood, an increase in its diffusion rate between the blood and the hypoxic tissue site. Non-specific adaptive reactions developing during the use of HBO provide a wide range of therapeutic effects. At the same time, along with the beneficial effect, hyperoxia can also have a toxic effect, the clinic of which de-pends on the duration of exposure, individual sensitivity to oxygen, on the influ-ence of concomitant factors: temperature environment, physical activity, density of the gas mixture. The implementation of the compensatory capabilities of HBO is promising only with timely optimal use of the method.