Is it normal to have a few hairs on my chin in the second year of junior high school?

It is a common phenomenon to grow hair on the body, and generally speaking, hair can grow on any part of the body. If the hair on the chin is too abundant, it is most likely due to endocrine abnormalities. It is best to go to the hospital for relevant examinations. You must pay attention to your eating habits and eat less spicy and irritating foods. If you feel that the hair affects your image, you can use laser to remove the hair.

Six sex hormones and normal values:

1) Follicle-stimulating hormone (FSH): Its main function is to promote the development and maturation of ovarian follicles. The concentration of blood FSH is 1.5-10mIU/ml in the pre-ovulation period, 8-20mIU/ml in the ovulation period, and 2-10mIU/ml in the post-ovulation period. Generally, 5 to 40 mIU/ml is considered normal.

2) Luteinizing hormone (LH): It mainly promotes ovulation. Under the synergistic effect of FSH, it forms a corpus luteum and secretes progesterone. The concentration of blood LH is 2-15mIU/ml in the preovulatory period, 30-100mIU/ml in the ovulatory period, and 4-10mIU/ml in the postovulatory period. The normal value during the non-ovulation period is generally 5 to 25 mIU/ml.

3) Prolactin (PRL): It is a simple protein hormone whose main function is to promote breast hyperplasia, milk production and milk discharge. During the non-lactation period, the normal value of blood PRL is 0.08-0.92nmol/L. If it is higher than 1.0nmol/L, it is hyperprolactinemia.

4) Estradiol (E2): The main function is to promote the transition of the endometrium into the proliferative phase and promote the development of female secondary sexual characteristics. The concentration of blood E2 is 48-521 pmol/L in the preovulatory period, 70-1835 pmol/L in the ovulatory period, and 272-793 pmol/L in the postovulatory period.

5) Progesterone (P): The main function is to promote the transition of the endometrium from the proliferative phase to the secretory phase. The blood P concentration is 0-4.8 nmol/L before ovulation and 7.6-97.6 nmol/L in the late ovulation period.

6) Testosterone (T): Its main function is to promote the development of the clitoris, labia and mons pubis. It has an antagonistic effect on estrogen and has a certain impact on systemic metabolism. The normal concentration of T in female blood is 0.7～3.1nmol/L.

Pay attention to timing before conducting the six sex hormone tests. The best time to check endocrine system is 3-5 days after menstruation. This period belongs to the early follicular stage and can reflect the functional status of the ovaries. However, for those who have not had their menstruation for a long time and are eager to know the test results, they can have the test at any time. The time will be taken as the time before menstruation, and the results will refer to the test results of the luteal phase.

The most accurate result is obtained when a woman has her blood drawn on an empty stomach at 9 a.m. on the 3rd to 5th day after her menstrual period. Women with infertility, amenorrhea, or long-term amenorrhoea can be examined at any time, but it is best to do so on an empty stomach.

As long as men do not do strenuous exercise and lead a regular life, they can take the six sex hormone tests at any time between 8 and 11 a.m. on an empty stomach.