It is not unheard of that a fertile female singer experiences slight fluctuations in the quality of the voice throughout the menstrual cycle. In particular, in the immediate premenstrual period, up to 40% of female singers may note a deeper shift in the vocal range, tone inaccuracy, and/or tendency to develop vocal cord hemorrhage . Such vocal changes are hypothesized to be secondary to the affect of estrogen and progesterone on the vocal fold tissues, and especially any blood vessels that …