Menstrual cycle, also known as menstrual cycle, is a physiological cycle, which occurs between some fertile female humans and other animals.

Other mammals go through estrus. In women of childbearing age and primate females, the endometrium undergoes periodic changes such as autonomous thickening, vascular proliferation, gland growth and secretion, endometrial collapse and bleeding and shedding every other month.

This periodic bleeding or uterine bleeding is called menstruation. Why do women have menstruation? First of all, we must understand the structure and physiological function of female reproductive organs in order to explain this problem.

Female internal reproductive organs are composed of ovaries, uterus and fallopian tubes. The main function of the ovary is to produce eggs and synthesize ovarian hormones, while the uterus and fallopian tubes are reproductive organs. There are hundreds of thousands of follicles in the ovary, and each follicle contains 1 egg.

Prepubertal follicles basically have no function. In adolescence, under the action of gonadotropin in the anterior pituitary gland, immature follicles gradually develop and estrogen is synthesized.

When the follicle matures and ovulates, the cell wall of the oocyte collapses and the cells become larger and yellow, which is called corpus luteum. It not only synthesizes estrogen, but also produces progesterone. With the change of ovary, the endometrium also changes periodically.

Estrogen makes endometrium thicken, endometrial cells increase and enlarge, and the ducts become more tortuous and spiral, which is called proliferative endometrium. After ovulation, due to the interaction of estrogen and progesterone, endometrial edema occurs, and glands produce a lot of mucus and glycogen, and the thickness of endometrium increases from 1 mm to 6 mm, which is called secretory endometrium.

If the ovum discharged at this time is fertilized, the fertilized egg is transported to the uterus through the fallopian tube for development, which is called pregnancy. The pregnant tissue synthesizes chorionic gonadotropin to support the continuous development of ovarian corpus luteum. If the egg is not fertilized, the corpus luteum will shrink about 14 days after ovulation and stop secreting estrogen and progesterone. At this time, the blood vessels in the endometrium contract, and the endometrium is necrotic and falls off, causing bleeding and forming menstruation. Therefore, the length of menstrual cycle depends on the length of ovarian cycle, which is generally 28-30 days, but it also varies from person to person, and there are also 23-45 days, even 3 months or half a year 1 cycle.

As long as it is regular, it generally belongs to normal menstruation. The bleeding time is generally 2-7 days, and the total amount of menstrual bleeding is 30-50 ml. Some people think that menstrual flow exceeding 80ml is a pathological state.

2. My period is coming. When my period is coming, my * * * is so strong. I had nothing to do the other day.

If you have sex during menstruation, there will be the following adverse consequences: First, because of the excitement of both parties, inserting * * * will make the female genitals congested, leading to an increase in menstrual flow and prolonged menstruation; Second, at this time, male genitals may bring bacteria into * * *. Menstrual blood is a good culture base for bacteria and other microorganisms. Bacteria are easy to breed, spread along many tiny wounds and ruptured small blood vessels in the endometrium, infect the endometrium, and even involve fallopian tubes and pelvic organs, which brings unnecessary trouble to the woman. Third, menstrual secretions entering the male urethra may also cause urethritis; Fourth, menstrual sexual intercourse, because * * * meets the overflowing blood cells in the damaged part of the endometrium, and even enters the blood, it can induce the production of anti-* * * antibodies, which leads to immune infertility.

Fifth, the menstrual period is the same, because the uterus contracts during sexual impulse, endometrial debris can also squeeze into the pelvic cavity, causing endometriosis and infertility. Therefore, for the health and reproductive health of both parties, menstrual behavior should be prohibited under any circumstances.

Girlfriend is menstruating, what should I do as a boyfriend?

Problem analysis: 1. Try not to wash your hair during the physiological period. If you have to wash it, try to wash it at noon and dry it immediately after washing.

2. Pay attention to keep warm during the physiological period, that is, blow less air conditioners and wear more clothes in air-conditioned rooms. 3, avoid drinking cold drinks: this is already a very basic common sense, don't violate it, don't make fun of your own beauty, drinking ice water will make dirty blood unable to be discharged smoothly, and staying in the body is absolutely harmful to the body.

Try the following drinks to make the physiological period more comfortable: longan jujube tea, health tea, Wei Zhendan ginseng, brown sugar Jiang Shui, astragalus gouqi tea, rose tea (especially if you have menstrual pain, you can drink rose tea). 4, eat sweets: eat chocolate and cakes during the physiological period, because eating sweets during the physiological period is not easy to gain weight! It also helps the metabolism of dirty blood.

5, refuse fatigue: adequate rest is very important, too tired will lead to prolonged menstrual period or excessive blood loss. 6, don't be too emotional: It is said that girls will naturally be in a bad mood during their physiological period, but don't indulge yourself in losing your temper, because losing your temper will disturb your menstrual period and hurt your liver.

4. Life tip: Is your period normal?

Is your period normal? Leslie, I found that many people still don't know what normal menstruation is. Below, let's take a look at popular science for everyone.

How long is the menstrual interval normal? Under normal circumstances, the menstrual interval is 28 days and the range between 2 1-35 days is normal. If it exceeds this, it is an abnormal phenomenon and the reason needs to be found. The immature menstrual axis of adolescents is also a common phenomenon between 2 1-45 days.

How long is the menstrual cycle normal? Usually the menstrual cycle is between 3-5 days, but 2-7 days is normal. Menstrual cycle exceeding 7 days is a common problem, which usually indicates disease. At this time, it is necessary to know whether there is a lesion in the uterus or a problem with ovarian function. Is dysmenorrhea a normal phenomenon? There should be no pain under normal circumstances.

If you have dysmenorrhea, it may indicate abnormality. Is it normal to have a blood clot? Blood clots appear in menstruation, indicating that there is too much menstrual flow, and it is necessary to check whether there is organic uterine lesions.

What is normal menstruation? Normal menstrual flow is between 10-80ml. How old are you? Is your menstruation abnormal? The first menstruation is called menarche, and the menarche age is usually between12 and13. If your menstruation is earlier than 9 years old or later than 15 years old, or you develop into * * * and have no menstruation for 3 years, it is abnormal and you need to go to the hospital for further examination.

How old is menopause to be abnormal? First of all, menopause refers to not menstruating for more than one year. The average age of menopause in China is 49. In general, irregular menstruation may occur before menopause 1-2 years, also known as entering perimenopausal period.

Menopause is abnormal before the age of 40. If menopause occurs before the age of 40, it is called premature ovarian failure. How old menopause is abnormal, generally no more than 55 years old.

If there is bleeding after menopause, it is an abnormal phenomenon, even a drop of bleeding is an abnormal signal in the body, so we need to be vigilant. More Life Tips Recommended reading: Life Tips: 12 Reasons for making you fat, have you ever been to into the pit? Life Tips: Pay attention to friends who love durian! Please pay attention! Tips for life: Doing this during menstruation can quietly become beautiful! Life tips: 13 wonderful skin care and beauty secret recipe! More powerful than plastic surgery.