Why do I get my period at 9 years old?

If a girl starts menstruating at the age of nine, it is an abnormal situation. It is a kind of precocious puberty, so parents need to pay attention to it. If they ignore it, their children's physical condition will only become more and more serious. After all, menarche usually comes when girls are around twelve years old. If it comes before the age of twelve, you need to go to the hospital for a detailed examination.

Menarche, also known as menstruation, refers to the first menstrual period. It represents the changes that a girl's body undergoes during puberty. Before the onset of menarche, a girl's breasts have begun to develop, her height has suddenly increased, and some have already grown pubic hair or underarm hair. Menarche usually occurs two years after the breasts begin to develop. A girl’s first menstruation is one of the important signs of the onset of puberty. Menarche means that the endometrium has developed due to the stimulation of estrogen, and it also means that the "pathway" from the uterus to the cervix to the vagina has opened. Most girls have their first period between the ages of 12 and 16. Generally speaking, menarche is often anovulatory menstruation, and ovulation occurs several months to a year after menarche.

Menarche and subsequent menstruation may not occur with ovulation. But there are rare cases where ovulation occurs one to two weeks before menarche.

The average age of first menstruation for Oriental women is between 12 and 16 years old. The statistics in different countries vary slightly, which is related to eating habits and climate.

In rare cases, menarche occurs very early, before breast development and other pubertal development. This symptom is called premature menarche. Other possible causes of bleeding must be ruled out before diagnosing this symptom.

If menarche does not occur more than three years after breast development, it is called primary amenorrhea. About 30% of primary amenorrhea is related to genetic abnormalities, resulting in poor gonadal function or incomplete development of reproductive organs. Anatomically, the closure of the hymen causes amenorrhea.

Some women have their first menstruation at age eighteen, but it is generally believed that if you have not had your first menstruation by age sixteen, you should consult a doctor. The cause of late menstruation may be being underweight or overweight. Both of these reasons are due to the low and high proportion of body fat, which affects the normal physiological function of the ovaries and causes late menstruation. In addition, the normal function of the pituitary gland that controls endocrine system, tumors in reproductive-related glands, medication, mental stress, etc. will all affect the timing of the first menstruation.

Menarche is considered by most women to be an important "milestone" in puberty.