What are the reasons for not having a menstrual period for one month?

Aug 24, 2022 Source: Cainiu Health
Disease description:

My previous menstrual cycles were all normal. Now I'm in a long-distance relationship and haven't been with my boyfriend. What could be the reason for missing my period for a month?

Doctor's answer (1)
Dr. Chen Zhe
A missed menstrual period for one month may be due to incomplete ovarian function in women. It could result from a recent onset of menstruation, leading to immature ovarian function and irregular menstrual cycles. These issues typically resolve gradually as the ovaries develop. Without contraception, pregnancy is possible. If menstruation is normally regular but suddenly becomes delayed by seven days or more, pregnancy is likely, and early signs of pregnancy may appear.