First, consider recent voice use for the possibility that it was “too much.” If so, and/or if the ceiling pitch remains lowered on subsequent trials of the tests later in the day, “back off” by reducing voice use until the ceiling returns to your usual pitch, whether “normal” as compared to other persons or not.Women: Some may find that the ceiling pitch lowers routinely during pre-menstrual days, but returns to normal in a few days.