Here is the English translation of the provided text: "Consecutive two menstrual periods with less flow are what reasons"

Patient's question:

I am a college student, female, only 23 years old. I'm always worried about irregular menstruation affecting future fertility, and I feel embarrassed going to the hospital. Could you please tell me: What are the reasons for having low menstrual flow for two consecutive periods?

Doctor's answer:

First, you need to clarify how you truly have a low menstrual flow. The menstrual cycle is generally 3-7 days, with a flow of 30-80 milliliters per period. The menstrual cycle is normal, with bleeding time less than 2 days, and the flow is less than 20 milliliters. It is usually believed to be hypomenorrhea. Hypomenorrhea is similar to hypermenorrhea in that both are abnormal phenomena. The causes of hypomenorrhea are similar to those of amenorrhea, except that the degree is different. The reasons are roughly as follows:
(1) Physiological: Caused by generational inheritance or environmental factors.
(2) Pathological:
① Congenital uterine underdevelopment, where the uterus is very small, with only a very small amount of endometrium shedding, resulting in low menstrual flow.
② Ovarian hypoplasia, where there are two types of special granules in the endometrial cells called lysosomes, which are related to menstrual blood volume and bleeding time.