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月经是指约一个月间隔发生,限定天数自然停止、来自子宫内膜的周期性出血。初潮指第一次来月经。青春期指从乳房发育、长出阴毛等第二性征出现开始,经历初潮、第二性征完成,月经周期近乎规律的这个期间,在日本从8～9岁开始,到17～18岁结束。早发月经指未满10岁出现初潮。迟发月经指15岁(既往为16岁)以后出现初潮。早发青春期指有早发月经或乳房开始发育时未满7岁或阴毛开始长出时未满9岁。迟发青春期指满11岁乳房尚未发育、满13岁阴毛尚未长出、满14岁尚无初潮。月经周期天数指月经来潮第一天至下次月经来潮前一天的天数,正常范围为25～38天,其变动在
Menstruation refers to the occurrence of about one month interval, limiting the number of days to stop spontaneously, from the endometrial cyclical bleeding. Menarche refers to the first time to menstruation. Adolescent refers to the development from the breast, the growth of secondary features such as pubic hair began to appear, experienced menarche, secondary sexual characteristics completed, the menstrual cycle is almost regular during this period, from 8 to 9 years old in Japan, to 17 to 18 years of age. Early menstruation refers to menarche under the age of 10. Late menstruation refers to menarche after 15 years of age (formerly 16 years old). Premature adolescence refers to early menstruation or breasts started to develop under the age of 7 or pubic hair began to grow under the age of 9 years. Delayed adolescent refers to full 11-year-old breast has not yet developed over 13-year-old pubic hair has not yet grown, full of 14-year-old yet no menarche. Menstrual cycle days refers to the first day of menstrual cramps to the next day before menstruation days, the normal range of 25 to 38 days, the change in