Significant interactions between menstrual cycle and BDNF genotype (F = 7.595, R2 = 0.048, P = 0.007), as well as among menstrual cycle, group and BDNF genotype (F = 4.509, R2 = 0.029, P = 0.035), on the Beck Anxiety Inventory score were noted. This evidence concerns the gene BDNF and Anxiety.