Oligomenorrhea, defined as menstrual cycles longer than 35 days or fewer than nine per year, is a common sign of PCOS, often resulting from androgen dominance.

“Androgen dominance often leads to what's called oligomenorrhea. So if you're having more than 35-day intervals in between a period or if you have less than nine per year, then that can be a sign that you have oligo, which means too little, menorrhea which means menses.”