Estrogen, Progesterone and Testosterone Explained
Estrogen, progesterone and testosterone explained: what each hormone does in women and men, how they change with age, and how they work together.
Estrogen, progesterone, and testosterone are three hormones with different jobs, and both women and men make all three. Women make more estrogen and progesterone. Men make more testosterone. But each hormone matters for both, and how they balance each other often matters as much as any one level.
This guide explains what each hormone does, how it changes with age, and the signs that it may be low or out of balance. It is about how these hormones work, not about treatment. If you want treatment details, our separate guides cover those.
What does estrogen do?
Estrogen is the main female sex hormone, but men need it too.
In women
Most estrogen is made by the ovaries, with smaller amounts made in fat tissue. It shapes the menstrual cycle, keeps vaginal tissue healthy, supports bone strength, and plays a role in mood, sleep, skin, and temperature control.
In perimenopause, estrogen levels swing up and down before eventually falling after menopause. That is when hot flashes, night sweats, poor sleep, vaginal dryness, and mood changes often show up.
In men
Men make estrogen mainly by converting some of their testosterone into estradiol. It supports bone health, libido, and mood. Too little can affect bones and sex drive. Too much can contribute to breast tissue changes and other symptoms.
What does progesterone do?
Progesterone is often called the calming hormone.
In women
Progesterone is made mainly after ovulation. It prepares the uterine lining each cycle and balances estrogen's effects. Many women notice it supports sleep and a calmer mood.
Progesterone often starts to drop earlier than estrogen, sometimes in the late 30s or early 40s, as ovulation becomes less regular. Signs can include trouble sleeping, more anxiety or irritability, heavier or irregular periods, and stronger PMS.
In men
Men make small amounts of progesterone in the adrenal glands and testes. It helps the body make other hormones, including testosterone. It is not usually a focus of men's hormone care.
What does testosterone do?
Testosterone is the main male sex hormone, but women need it too.
In men
Most testosterone is made by the testes. It supports muscle and strength, bone density, sex drive, erections, energy, motivation, and red blood cell production. Levels tend to decline gradually with age, and some men drop lower or faster than others.
Signs of low testosterone in men can include constant fatigue, lower drive, changes in libido or erections, loss of muscle, more weight around the middle, brain fog, and irritability. Our hormone therapy options for men guide covers how this is approached.
In women
Women make testosterone in the ovaries and adrenal glands, in much smaller amounts than men. It supports libido, motivation, muscle tone, and mental sharpness. Levels decline gradually with age, and many women notice lower desire or less drive in midlife.
How do these hormones work together?
None of these hormones acts alone. They balance and influence each other.
In a woman's cycle, estrogen rises first and builds the uterine lining. After ovulation, progesterone rises to stabilize that lining and balance estrogen. When ovulation becomes irregular in perimenopause, progesterone can fall while estrogen still swings, which can make symptoms feel unpredictable.
In men, some testosterone is naturally converted into estrogen. That conversion is normal and needed, but the balance matters. When testosterone changes, estrogen often changes with it.
For both, it is common for symptoms to come from the relationship between hormones, not one level alone. Our foundation piece on what hormone balance really means explains this in more depth.
Quick comparison
| Hormone | Main jobs | What changes with age | Common signs of low levels |
|---|---|---|---|
| Estrogen | Cycle, bone, vaginal health, mood, temperature control | Swings in perimenopause, falls after menopause | Hot flashes, night sweats, dryness, poor sleep, mood changes |
| Progesterone | Uterine lining, balancing estrogen, sleep and calm | Often drops first as ovulation becomes irregular | Poor sleep, anxiety, heavier or irregular periods |
| Testosterone | Libido, muscle, bone, energy, motivation | Declines gradually in both women and men | Low drive, fatigue, muscle loss, lower libido |
How does hormone testing work?
Testing usually involves a blood draw. For men, testosterone is often checked in the morning, when levels are highest. For women in perimenopause, hormone levels can change from day to day, so one result may not capture the full picture.
That is why symptoms matter alongside the numbers. A level that looks normal on paper can still sit alongside very real symptoms. A provider who reads your labs and your story together can usually make more sense of both.
If you are trying to figure out whether hormones are behind what you have been feeling, our hormone imbalance symptom guide is a good place to start.
What we commonly see
Many women are surprised to learn that testosterone matters for them, or that progesterone often shifts before estrogen does. Many men are surprised that estrogen plays a role in how they feel. Understanding the basics usually makes the rest of the conversation much easier.
When treatment does come up, it is worth knowing the options. Women can read our guide to hormone therapy options for women, and anyone curious about hormones that match what the body makes can learn about bioidentical hormone therapy.
Care close to home
Magnolia Health & Wellness is at 18333 Egret Bay, Suite 148, in the Clear Lake area of Houston. We see women and men from across the Bay Area, including patients coming in from Pearland. For an overview of how hormone care works at our clinic, see our page on hormone replacement therapy.
Common questions
- What is the difference between progesterone and testosterone?
- Progesterone mainly supports the uterine lining, balances estrogen, and helps with sleep and calm. Testosterone supports libido, muscle, energy, and motivation. Both are made by women and men, in different amounts.
- Do women need testosterone?
- Yes. Women make testosterone in smaller amounts than men, and it supports libido, motivation, muscle tone, and mental sharpness. Levels decline gradually with age.
- Can you take progesterone and testosterone without estrogen?
- Some women use progesterone alone, or with low-dose testosterone, depending on their stage and symptoms. It is individualized. If you take estrogen and still have a uterus, progesterone is included to protect the uterine lining.
- Do men need estrogen?
- Yes. Men make estrogen by converting some testosterone, and it supports bone health, libido, and mood. The balance between the two matters.
- Which hormone drops first in women?
- Progesterone often starts to drop first, as ovulation becomes less regular in perimenopause. Estrogen tends to swing before it falls.
Your next step
If you want help understanding your own hormones, contact our Clear Lake clinic or call (281) 223-1696. We will listen to what you have been noticing and explain what your labs and symptoms may be telling you.
This article is general education and not medical advice. Decisions about hormone testing and treatment should be made with a licensed provider who knows your history.