While hormones are essential for reproduction, they are also crucial for the other systems of the human body. Hormones are molecules that are produced by the endocrine system that send messages to various parts of the body. They help to regulate multiple processes of the body like blood pressure, hunger, and sexual drive. Hormones are released from endocrine glands. They instruct the body on how to breathe and how to use energy. Here, we will talk about hormones that are present in females as well as males. This section will tell us what estrogen and progesterone are and what causes high estrogen levels.

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Hormones are chemical secretions. Hormones flow through the whole body but target specific cells designed to receive their message. Hormones and hormone receptors sites work in combination, like lock and key. Hormones are made from proteins or steroids, which function as messengers of the body and maintain an internal balance. In simple words, hormones keep the body in a state of equilibrium or homeostasis. These secreted hormones or chemicals flow throughout the body, along with the bloodstream. Fig.1

Types of Female Hormones

The two primary female sex hormones are estrogen and progesterone. Testosterone is a male hormone; however, females also produce it and need a small amount of this hormone.

Estrogen: The primary female hormone is estrogen. A significant share of hormone estrogen comes from the ovaries, however small amounts of estrogen are also produced in the adrenal glands and fat cells. The placenta also makes estrogen during pregnancy.
Progesterone: Ovaries produce the female sex hormone progesterone after ovulation. The placenta also produces some progesterone during pregnancy. Similar to estrogen, progesterone is also produced in the adrenal tissue and ovaries.
Human Chorionic Gonadotropin (HCG): HCG is yet another hormone that is produced naturally in women. It is made in the cells that make up the placenta at the time of pregnancy. This hormone is found in urine and blood tests that are done for pregnancy.
Testosterone: Predominantly a male hormone, testosterone is produced in small amounts in women as well. Similarly, a small amount of estrogen is also produced in men. Testosterone hormone is developed by other hormones such as DHEA and DHEA-S.
DHEA: Dehydroepiandrosterone is a kind of steroidal hormone that is produced in the adrenal gland.

Functions of Female Hormones

Numerous hormones synthesised by several glands perform an immense number of functions that serve different purposes. Each of the major hormones such as estrogen, progesterone, and testosterone perform several functions, such as

Estrogen plays a vital role in reproductive and sexual development. The part also extends to puberty, menstruation, pregnancy, and menopause. Estrogen also affects the working of the brain, cardiovascular system, hair, musculoskeletal system, skin, and urinary tract.
The role of the other primary hormone, progesterone, is to prepare the lining of the uterus for a fertilised egg, support pregnancy, and suppress estrogen production after ovulation.
Small amounts of male hormone testosterone come from the adrenal gland and ovaries. This hormone plays a crucial role in several body functions such as sexual desire, regulation of the menstrual cycle, and bone and muscle strength.
HCG (human chorionic gonadotropin) is produced by the developing placenta, stimulates the ovaries to produce higher levels of estrogen and progesterone that are needed to sustain a pregnancy.

Note: Hypothalamus, a part of the brain, starts to release large pulses of gonadotropin-releasing hormones GnRH- It stimulates the pituitary gland ( in the brain) to produce luteinising hormone- LH and follicle-stimulating hormone- FSH, which in turn cause a girls’ ovaries to start producing other hormones.

Female Hormone Imbalance

Hormonal imbalance happens when there is over or underproduction of a hormone in the bloodstream. Hormones play essential roles in the body; minor irregularities can cause side effects throughout the body.

Hormonal imbalances are more prevalent during puberty, menstruation, and pregnancy. Several hormonal imbalances are due to external factors such as stress or hormone medications. However, hormonal imbalances can also be due to any medical condition that impact or involve the endocrine system or endocrine glands.

Hormone Test and Normal Levels

Blood tests determine Estrogen levels. The normal levels are 15- 350 pg/ml for premenopausal adult female and ˂10 pg/ml for a postmenopausal adult female.

Blood tests determine Progesterone levels. 0.1 to 0.3 ng/ml at puberty to 290 ng/ml in the third trimester is normal.

Blood tests determine testosterone levels. The normal level is 15 to 70 ng/dl.

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FAQs on Female Hormones and Their Role in the Female Reproductive System

1. What are female hormones?

Female hormones are chemical messengers that regulate the development, reproduction, and overall physiology of the female body. The main female sex hormones include:

Estrogen – controls development of female secondary sexual characteristics and regulates the menstrual cycle.
Progesterone – prepares the uterus for pregnancy and maintains it.
Follicle-stimulating hormone (FSH) – stimulates ovarian follicle development.
Luteinizing hormone (LH) – triggers ovulation and corpus luteum formation.

These hormones are primarily produced by the ovaries and regulated by the hypothalamus and pituitary gland.

2. What is the function of estrogen in the female body?

Estrogen is the primary female sex hormone responsible for reproductive development and menstrual cycle regulation. Its key functions include:

Development of secondary sexual characteristics such as breasts and wider hips.
Thickening of the endometrium during the menstrual cycle.
Regulation of the menstrual cycle.
Maintenance of bone density and cardiovascular health.

It is mainly produced by the ovarian follicles and plays a central role in female reproductive biology.

3. What does progesterone do in females?

Progesterone is a hormone that prepares the uterus for pregnancy and supports early embryonic development. Its major roles include:

Maintaining the endometrial lining after ovulation.
Supporting implantation of a fertilized egg.
Reducing uterine contractions during pregnancy.
Regulating the second half (luteal phase) of the menstrual cycle.

Progesterone is secreted mainly by the corpus luteum and later by the placenta during pregnancy.

4. How do female hormones regulate the menstrual cycle?

Female hormones regulate the menstrual cycle through coordinated interactions between the hypothalamus, pituitary gland, and ovaries. The process occurs in phases:

Follicular phase: FSH stimulates follicle growth and estrogen production.
Ovulation: A surge in LH triggers release of the mature egg.
Luteal phase: The corpus luteum secretes progesterone to maintain the uterine lining.

If fertilization does not occur, hormone levels drop, leading to shedding of the endometrium as menstruation.

5. Where are female hormones produced?

Female hormones are mainly produced in the ovaries and regulated by the brain. The key production sites include:

Ovaries – secrete estrogen and progesterone.
Anterior pituitary gland – releases FSH and LH.
Hypothalamus – secretes gonadotropin-releasing hormone (GnRH) to control pituitary activity.

During pregnancy, the placenta also produces estrogen and progesterone.

6. What is the difference between estrogen and progesterone?

Estrogen mainly promotes reproductive tissue growth, while progesterone maintains the uterine lining for pregnancy. Key differences include:

Estrogen: Stimulates endometrial growth and secondary sexual characteristics.
Progesterone: Stabilizes and maintains the endometrium after ovulation.
Estrogen dominates the follicular phase; progesterone dominates the luteal phase.

Both hormones work together to regulate the menstrual cycle and fertility.

7. What role does FSH play in females?

Follicle-stimulating hormone (FSH) stimulates the growth and maturation of ovarian follicles. Its main functions are:

Promoting development of primary follicles in the ovary.
Stimulating estrogen secretion from developing follicles.
Supporting the early phase of the menstrual cycle.

FSH is secreted by the anterior pituitary gland under the control of GnRH.

8. What triggers ovulation in females?

Ovulation is triggered by a sudden surge in luteinizing hormone (LH). The sequence is:

Rising estrogen levels from the dominant follicle.
Positive feedback on the pituitary gland.
Release of a large LH surge.

The LH surge causes rupture of the mature follicle and release of the ovum from the ovary.

9. How do female hormones affect pregnancy?

Female hormones maintain pregnancy by supporting the uterine environment and fetal development. Key hormonal roles include:

Progesterone – maintains the endometrium and prevents uterine contractions.
Estrogen – promotes uterine growth and blood supply.
Human chorionic gonadotropin (hCG) – maintains the corpus luteum in early pregnancy.

These hormonal changes ensure proper implantation and continuation of pregnancy.

10. What happens when female hormone levels are imbalanced?

An imbalance in female hormones can disrupt the menstrual cycle, fertility, and overall health. Common effects include: