The cause of pregnancy rhinitis is presumed to be the hormonal changes of pregnancy. Estrogen would be a logical cause, as levels increase during pregnancy due to the secretions from the enlarged corpus luteum and the placenta.2 However, in one study, only 35% of subjects experienced worsening congestion during pregnancy, and 39% actually breathed more easily as the pregnancy proceeded.1 The roles of progesterone, prolactifi, stress, and increased blood volume have been explored, but the true cause of pregnancy rhinitis remains elusive.Risk factors for pregnancy rhinitis include a history of smoking. Maternal age, parity, and fetal gender are not predictive factors.
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