menstruation月经(学名，俗称大姨妈);

menophania 月经初潮;

menstrual cycle 月经周期;

period经期/例假(口语简称，during/be on one's period来例假);

Irregular menstruation/cycles/periods月经失调;

Dysmenorrhea 痛经;

Menstrual pain/cramps 经痛(正常或非正常疼痛)