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How Do Menstruation Occurs

Sep 29, 2022

Menstrual Cycle

The blood that passes through your cervix and comes out from the vagina is partially blood and the tissue of the endometrium inside the uterus wall. This shedding of the inner lining of the uterus is called menstruation.

A menstrual cycle is an event occurring each month that describes the process of preparation for the chances of pregnancy that occurs each month.  

A menstrual cycle starts from day one of your period. Normally, the average menstrual cycle is 28 days in length, however, it may vary in a range of 21 to 35 days. There are various phases involved in the menstrual cycle event that is stimulated by the rise and drop of hormones. Your brain triggers the pituitary gland and the ovaries present in the reproductive system to secrete some hormones during your menstrual cycle that makes other parts of the reproductive system react in such a way. 

Menstruation Age

Generally, every girl attains menstruation at the average age of 12. However, the age of menstruation varies from person to person depending on their health and lifestyle conditions. For some girls, menstruation begins as early as they are 8 years or as late as 16 years of age. 

About the age of 51, most women may stop menstruating. This span is said to be menopause in which ovaries may stop producing eggs or stops ovulating. During this span, the woman has no periods for one year, and after this, it is not possible to become pregnant.

Phases of Menstrual Cycle

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Menstrual phase

This phase is said to be from day one to five. If pregnancy has not happened, it is the time when the uterus lining sheds out through your vaginal opening. Mostly, every woman may bleed for 3 to 5 days, but if the period lasts for only 2 days and ranges as many as 7 days it is also normal. 

Follicular phase

This phase takes place between days 6 to 13. Your brain stimulates your reproductive system and prepares the uterus for pregnancy. In this phase, the level of estrogen rises causing the endometrium, the inner lining of the uterus to grow and this layer becomes thickened. 

Additionally, another hormone called follicle-stimulating hormone (FSH) causes many follicles to grow in your ovaries. During 10 to 14 days, any one of the developed follicles may form a mature egg, which we call an ovum.

Phase of Ovulation

This phase occurs on the 14h day when your menstrual cycle is regular for 28 days monthly. In this phase, a hormone called luteinizing hormone rises rapidly and makes any of your ovaries release its egg. This process is called ovulation.

Luteal phase

This phase happens from day 15 to 28. The released egg travels in the fallopian tubes to reach the uterus. At this time, the progesterone hormone level rises to maintain and help to prepare the inner uterine lining for pregnancy. If the sperm comes through the vagina, it enters the cervical opening and the fertilized embryo attaches itself to the uterine wall, thus you become pregnant. In case, if pregnancy does not happen, both estrogen and progesterone hormone levels drop and make the thickened lining of the uterus shed causing the menstrual period.

Related: Periods After Pregnancy

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