The Hormone Myth That Won’t Die

The Hormone Myth That Won’t Die

I’ll never forget the year 2002, when a single study told American women that hormone therapy causes breast cancer. The press release came out before the study was even published.

The headline stuck. Doctors stopped prescribing. Women stopped asking. The number of women on hormone therapy dropped off a cliff almost overnight, and it has never fully recovered. Over twenty years later, most of us are still living in that headline instead of the data.

Here’s the data.

The Math Nobody Showed You

In that 2002 study—the Women’s Health Initiative (WHI for short)—nine women out of every 10,000 on a placebo developed breast cancer. Among women on combined estrogen-progestin therapy, it was thirteen out of 10,000.

That’s four more women. Out of ten thousand.

The media called it a 30% increase. Technically true—and technically the kind of true that scares you without informing you. It’s called relative risk. The absolute risk—the number that actually tells you something—is four-tenths of one percent. I’ve taught this distinction to patients for several decades because once you see it, you can’t unsee it. Every scary health headline you’ll ever read deserves this same fact check.

And here’s the part almost nobody printed: in the same landmark study, women given estrogen alone—no progestin—had fewer cases of breast cancer than the women on placebo. Not equal. Fewer.

This wasn’t a fluke.

The Good News You Didn’t Hear

Twenty-plus years of follow-up data now confirm these findings and even more good news: women on estrogen therapy have a significantly lower incidence of colon cancer, heart disease, osteoporosis, dementia, and yes, breast cancer.

In both arms of that fateful WHI study (combined estrogen-progestin and estrogen alone), women had lower mortality from all causes (including breast cancer!). So “hormones cause breast cancer” was never an accurate sentence. It was a headline that never told the true story.

What Fear Actually Costs

I had a patient—I’ll call her Eleanor—who had a hysterectomy in her 30s, with ovaries removed along with it. Surgical menopause, decades early. Her doctor started her on Premarin, made from horse urine.

Then the Women’s Health Initiative (WHI) study published its first findings. Her doctor got scared. She got scared. She stopped.

When she turned 68, a routine mammogram found early-stage breast cancer. Lumpectomy and radiation, done. No recurrence. She’s in her 80s now and is cancer-free—that part of her story has a positive ending.

The hormones didn’t have a great ending. Those years without estrogen left her with such severe vaginal atrophy — what we now call genitourinary syndrome of menopause — that she couldn’t have sex with her husband anymore. Her bones became thin and easily breakable. She started getting urinary tract infections (UTIs), one after another.

Nobody puts that in a headline.

The Risk You’re Not Being Warned About

Here’s what doesn’t make the news: recurrent UTIs in older women aren’t just uncomfortable. Data shows that untreated genitourinary menopause symptoms send women to the ER, the hospital, and occasionally the ICU — sepsis from a “simple” UTI is a real and rising cause of death in older women. Research shows that local vaginal estrogen could save Medicare alone over $1,000 per patient per year, just by avoiding UTI complications. Multiply that across millions of women, and you’re looking at a public health cost nobody’s tallying because everyone’s still afraid of the wrong thing.

Vaginal estrogen, by the way, barely enters the bloodstream. It’s not the systemic therapy from that 2002 study. It’s an entirely different conversation—and one almost no one’s having with their doctor, because the fear got generalized to all estrogen, everywhere, forever.

The FDA removing the black-box warning from topical low-dose estrogen has helped, but we still have a long way to go to make up for decades of fear and the loss of hormone benefits for women.

Replace Fear with Facts

None of this means hormone therapy is risk-free or right for everyone. A woman with a strong family history of breast or other hormonal-based cancer, a personal history of it, or certain genetic markers needs a more careful, individualized conversation—and that conversation should happen with a doctor who actually understands the nuances, not one responding to headlines.

This isn’t about throwing caution to the wind. It’s about replacing fear with facts so women can live with the quality of life they deserve.

You deserve full information before you decide. Not the relative risk dressed up to scare you, compared to the absolute risk, which is often very small.

Everything in life is a matter of risk versus benefit. Luckily, for nearly all women in midlife and beyond, the benefits of hormone therapy significantly outweigh the risks.

Talk with an Expert

Talk to a hormone-literate doctor. Ask about the different ways to replenish hormones in midlife and beyond. Ask about vaginal estrogen, even if you think, “That’s not for me.” Then ask again, because this is too important to let slide after one appointment.

The myth that “hormone therapy causes cancer” is a myth that has had over twenty years to die. Let’s not allow it twenty more.

Your health and your quality of life matter too much to be left to a myth.

Dr. Liz Lyster, a Board-Certified OB/GYN with over 35 years of experience, is passionate about helping women and men in midlife boost their energy, balance their hormones, and achieve optimal health. A bestselling author, mom to two grown sons, world traveler, and new widow, Dr. Liz helps people, both in person and online, feel their best so they can do their best. something you reclaim.

“I got into medicine to help women feel better—not to watch them suffer because of a headline nobody fact-checked. That’s the whole reason I wrote this piece.”

– Dr. Liz Lyster

• Connect with Dr. Liz Lyster
• More articles from our Executive Contributor, Dr. Liz Lyster