menstruation; menstrual period
Standard medical and everyday term for menstruation.
I started menstruating when I was 12.
月経周期は個人差があります。
Menstrual cycles vary from person to person.
My period hasn't come yet this month.
Her period stopped due to stress.
She has her period regularly every month.
menstrual pain; menstrual cramps; dysmenorrhea
amenorrhea