How often does menstruation come?

Patient's question:

Since I got my period at 13, it's been like this until I'm 20 years old.

Doctor's answer:

20 years old: If menstrual pain during puberty becomes increasingly severe with age, it may be a sign of endometritis.
30 years old: Menstruation at this age is the most regular phase of a woman's life. Compared to menstrual pain in the 20s, if sexual intercourse pain also occurs, it's more important to pay attention. Women in their 30s are more likely to be troubled by PMS (premenstrual syndrome), often spending several difficult days before each period. Menstrual pain and excessive menstrual flow in women in their 30s may be symptoms of endometritis or uterine fibroids.
40 years old: The length of the menstrual cycle begins to change, transitioning from a 21-day cycle to 35 days, then to 27 days, which is normal. Additionally, menstrual flow may increase. Irregular bleeding in women in their 40s may be a symptom of uterine polyps. Although the ovaries no longer ovulate as regularly as before and the frequency of ovulation has decreased, contraception should not be overlooked. The rate of unintended pregnancy in women in their 40s is as high as that in teenagers.

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