The term "menstrual" refers to anything related to menstruation, which is the monthly process that occurs in women's bodies where the uterus sheds its lining. During this time, blood and tissue are expelled from the body through the vagina. Menstrual cycles typically occur every 28 days, although they can vary between individuals. The term "menstruation" is often used interchangeably with "period," which refers to the flow of blood that occurs during menstruation.