The absence of menstruation depends on what the situation is, if it is an adolescent girl, for example, others are due to have their periods and you have not. If you reach the age of 18 and you haven’t had your period, then you should generally pay attention to it and you must go to the hospital for a checkup. Some people are born without a uterus, others are born without ovaries, and ovaries are missing in this case. If you don’t have a period at this age, you must go to the hospital for an ultrasound to determine the development of the uterus and ovaries. If the absence of menstruation occurs at the age of menopause, is it going to be amenorrhea? So the absence of menstruation depends on what age it is, and then go for ultrasound or color ultrasound accordingly.