Most girls grow pubic hair before menstruation, but due to individual differences, some people may have menstruation before growing pubic hair, the specific situation varies from person to person.
Generally speaking, according to the developmental order of puberty, the development of pubic hair should occur first, and then the first menstruation will occur; the growth of pubic hair signifies the development of secondary sexual characteristics, and only after the development of the secondary sexual characteristics will the function of the ovaries be perfected, and only then will the ovaries secrete estrogen and progesterone periodically, so that the endometrium undergoes cyclic changes and then menstruation will occur.
However, there is no relationship between the two, the development of armpit hair and menstruation is not directly related to the individual’s physical condition; some children will first appear menstruation, some are the first to appear the development of armpit hair, but the two will have a mutually reinforcing effect, there are already armpit hair and pubic hair, the menstruation will also soon come.
There is also a special case, that is, women do not grow pubic hair throughout their lives, but menstruation is normal. This is mainly due to genetic factors, is a normal physiological phenomenon.