Everything You Need to Know About Estrogen

I found an old note from a doctor's visit recently. It said “patient complaining of weight gain and moodiness.” That was it. 

No connection made. No hormone conversation started. No follow up questions. Just a woman in her late 40s with brain fog so bad she was losing words mid-sentence on live television, waking up at 3am soaking through her pajamas, joints aching in ways they never had, mood changes that scared her, and a doctor who wrote down weight gain and moodiness and called it a day.

And then I finally sat down with a doctor who understood menopause and she said, “Tamsen, all of this is estrogen. All of it.”

That was the moment everything changed, and this episode is the moment I want every woman reading this to have.

What estrogen actually is

Estrogen is one of the three main female hormones alongside progesterone and testosterone. But it is not just a reproductive hormone. You have estrogen receptors in your brain, your heart, your bones, your skin, your joints, your gut, your bladder, and your vaginal tissue. Estrogen has been quietly running almost every system in your body for decades. Most of us had no idea until it started to leave.

The estrogen that matters most in midlife is estradiol. It is the one that drops in perimenopause and crashes in menopause. When your doctor says estrogen replacement, estradiol is what they are actually replacing.

In your 20s and 30s your estradiol is high and rises and falls across your monthly cycle. In your 40s it starts to fluctuate wildly, one month high and the next month tanking. That is perimenopause. That is why this stage feels so chaotic. And by the time you are in post-menopause your body is making almost none of it on its own.

What estrogen does in your body

1. Your brain. Estrogen affects memory, mood, focus, and the way your brain processes information. When it drops the brain fog kicks in. The word you cannot find. The reason you walked into the kitchen and forgot why. Estrogen is also tied to serotonin production, which is why so many women in perimenopause are suddenly told they have depression when what they actually have is a hormonal shift.

2. Your bones. Estrogen tells your body to keep building bone instead of breaking it down. When it drops bone loss speeds up dramatically. This is why one in two women over 50 will break a bone from osteoporosis. It is not about being clumsy. It is about losing the hormone that was holding the bone together.

3. Your heart. Cardiovascular disease is the number one killer of women. Estrogen helps protect your blood vessels and when it drops your risk of heart disease starts climbing. Early research suggests estrogen may help with cardiovascular health for women who start it close to menopause. The research is still building but the heart conversation is worth having with your doctor.

4. Your skin and joints. Collagen production drops with estrogen. That is why your skin feels different and why your joints ache and why you wake up stiff. You are not just getting older. You lost the hormone that was keeping your connective tissue elastic.

5. Your sleep. Estrogen helps regulate body temperature. When it drops your internal thermostat breaks. Hot flashes during the day. Night sweats at 4am. Sleep disrupted in ways that can follow you for years.

6. Your vagina, bladder, and sex life. Estrogen keeps the tissue of your vagina, vulva, and bladder healthy. When it drops you get vaginal dryness, painful sex, recurring UTIs, and urgency. This category of symptoms used to be dismissed as just getting older. It is not. It is treatable and we have a full episode dedicated to this coming up.

7. Your mood. The crying out of nowhere. The rage you have never felt before. The shorter fuse. The feeling that you are not yourself. Estrogen is involved in all of it.

Who needs it

If you are in perimenopause and your symptoms are disrupting your life you are a candidate. Hot flashes waking you up. Brain fog affecting your work. Mood changes that scare you. Joint pain. Heart palpitations. Sleep falling apart. You do not have to wait until you have not had a period for a full year, you can start the conversation now.

If you are within 10 years of your final period or under 60 you are in what doctors call “the window.” Major medical organizations agree that starting hormone therapy in this window is generally the safest and most beneficial time. Inside the window the data supports hormone therapy for symptom relief and bone protection.

If you are post-menopausal and beyond the window you are not out of options. If you have been told you are too late, get a second opinion. That answer is too blanket.

If you have a uterus and take estrogen you must also take progesterone. Estrogen alone causes the lining of your uterus to build up over time. Progesterone keeps it in check. (I covered this in my progesterone episode.)

Who should not take it

If you have a personal history of breast, ovarian, or uterine cancer hormone therapy is usually not recommended. If you have a history of blood clots, stroke, or heart attack your doctor will likely steer you toward other options. If you have unexplained vaginal bleeding your doctor will want to understand what is happening first.

This is exactly why finding a doctor who actually understands menopause matters. They will look at your full history and figure out what is safe for you. And if hormone therapy is not the answer they will tell you about real alternatives. You are not out of options.

The breast cancer question

I want to address this directly because I know it is what every woman is thinking.

The Women's Health Initiative study in 2002 has been reevaluated and reinterpreted many times since those headlines ran. The risk it created was overstated for women in the window. A whole generation of women was denied treatment based on a misread of that study and that cost us decades of unnecessary suffering.

For most healthy women under 60 within 10 years of menopause the doctors I have talked to say the benefits of hormone therapy outweigh the risks. Talk to your doctor about your personal history. But please do not let an outdated headline from 2002 make this decision for you. I almost did. It kept me suffering for years longer than I needed to.

Your options

Body identical estrogen, also called bioidentical, is chemically identical to what your body makes. FDA approved, available by prescription, and what most menopause specialists are prescribing today.

The patch is worn on the skin and changed twice a week. Most doctors prefer it because it bypasses the liver, which is associated with a lower risk of blood clots compared to the pill. There is a significant shortage right now. See below if you cannot find yours.

Gels and sprays are applied to the skin daily and have the same liver-bypassing benefit as the patch. One of the most important alternatives right now.

Pills are taken orally once a day. Processed through the liver which is why patches and gels are often preferred, but pills are a real and valid option for many women.

Vaginal estrogen in creams or rings is specifically for vaginal and urinary symptoms. The dose is low and localized. It does not raise your systemic estrogen levels meaningfully and the safety profile is excellent. Doctors call it one of the best-kept secrets in medicine.

Compounded creams are custom-made by a compounding pharmacy with a prescription. 

If you cannot find your patch

Do not stop taking your hormones. 

Contact your doctor before you run out and ask about backup options. Compounded creams from a compounding pharmacy are one of the best backups right now because they are made to order and not dependent on the same supply chain. You can also switch to a gel, spray, or pill at an equivalent dose with your doctor's guidance.

I sat with the FDA alongside Midi Health to push for action on this. The shortage is expected to last a while. Make a plan with your doctor now. The alternatives work just as well for most women.

How long can you be on it

There is no single right time to stop. The shortest time, lowest dose rule came from the same flawed 2002 study. The Menopause Society takes a different view today. The decision is individualized between you and your doctor based on your symptoms, health history, risk, and goals. Some women taper off after years. Others stay on indefinitely for bone protection and quality of life. Some come off, find their symptoms return, and go back on. There is no universal expiration date.

What to watch for once you start

It takes time. Most women do not feel the full benefit for two to three months. Do not give up at week two.

Mild side effects in the first month are normal. Breast tenderness, some bloating, maybe some breakthrough spotting. Most of this settles down. Talk to your doctor if it does not.

If you are on the patch rotate between your lower belly and hip. If it is falling off ask about a different brand. For the sticky residue it leaves behind try olive oil, lemon juice, or a makeup remover.

Track your symptoms throughout and bring the list to your follow-up appointment (I have a FREE downloadable tracker here). It will help your doctor make sure you are on the right dose. I also have a FREE Hormone Therapy 101 sheet that walks you through exactly what to track and what questions to ask. 

You have estrogen receptors in almost every system in your body. When estrogen drops you feel it everywhere. And there are real well-studied widely available options to help.

A doctor wrote weight gain and moodiness in a chart and sent me home. That was not enough then and it is not enough now.

You deserve the full picture. This was it.

Listen to Estrogen 101: What I Learned From the World’s Top Menopause Doctors here or you can watch it here.

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