The timing matters, as one expert says it's all part of health discussions "to prevent chronic conditions in the future."
Women have used hormone replacement therapy (HRT) for decades to relieve menopausal symptoms ranging from hot flashes to sleep disruption—though the treatment has long carried strict safety warnings. But in November 2025, the U.S. Food & Drug Administration (FDA) announced it would remove the “black box” warnings from menopausal HRT products, walking back decades of concern over potential risks.
Now, recent research from Case Western Reserve University is helping explain why. In a massive study analyzing more than 120 million patient records, researchers found that HRT may actually improve a woman’s long-term health outcomes when treatment is started early, ideally in the years leading up to menopause.
However, the study authors stress that the findings should be interpreted carefully: HRT isn’t a cure-all, and the results show associations rather than cause and effect. Still, the research suggests estrogen therapy is not only safe for women—contradicting decades-old research—but a potentially beneficial tool for long-term health and wellness beyond symptom relief.
What hormone replacement therapy actually does
As women go through menopause, the ovaries produce less estrogen and progesterone—hormones that play key roles in regulating everything from body temperature to bone health. HRT, which is now commonly referred to as menopausal hormone therapy (MHT), works by restoring those declining hormone levels.
This process offers relief from common menopausal symptoms like hot flashes, night sweats, sleep disruption, and bone loss—issues that can significantly impact both daily life and long-term health.
Why hormone replacement therapy got a bad reputation
Much of the concern around HRT dates back to the Women’s Health Initiative study published in 2002, which raised alarms about a possible link between hormone therapy and an increased risk of breast cancer and cardiovascular events.
However, experts—including officials at the FDA—now say those risks may have been overstated. The study primarily involved women with an average age of 63 (more than a decade past the typical age of menopause) and used hormone formulations that are no longer commonly prescribed today.
Still, many women avoided HRT altogether, even as symptoms disrupted their sleep, mood, and quality of life. The FDA has since described the earlier messaging around risk as a “distortion,” prompting the removal of the boxed warnings.
What new research says about hormone replacement therapy
The 2025 study, led by researchers at Case Western Reserve University, analyzed more than 120 million patient records, making it one of the largest real-world investigations into HRT/MHT to date.
“We found that there was no increased association of heart attack, stroke, or breast cancer among the women who started MHT prior to menopause compared to those who started after menopause,” says co-author Rachel J. Pope, MD, MPH, associate professor of women’s health at University Hospitals in Cleveland, Ohio. That finding alone challenges long-standing assumptions.
Still, some data also suggested a significantly lower breast cancer risk—up to 60%—among women who started therapy sooner. However, Dr. Pope emphasizes that the purpose of this study was to look at associations, and this observation doesn’t prove a protective effect.
In fact, her explanation for the positive outcomes may be more straightforward. She thinks it comes down to meaningful engagement in healthcare.
Why timing matters
“We don’t have strong evidence yet, but I do think that women who start MHT earlier should have improved outcomes long-term,” says Dr. Pope. And this is not only because of the hormone therapy itself, “but because they are addressing their health concerns and [are] engaged with a healthcare professional who will help to monitor things like hypertension—something that could cause problems in the future if not addressed, and is often undetected because of a lack of symptoms.”
In other words, opting for earlier HRT may be part of a broader pattern of preventive healthcare at a younger age.
Timely symptom relief may also make it easier to maintain healthy habits. “We all need to be engaging in more cardiovascular exercise, strength training, and healthy eating and sleep,” Dr. Pope says. “These basics can’t be forgotten, and if MHT helps you to do any of that, it will be helpful.”
These perspectives align with other research findings. According to the FDA’s 2025 announcement, studies show that women who initiate HRT within 10 years of menopause (generally before age 60) may experience reduced risks of fractures and all-cause mortality. Some research also points to lower risks of cardiovascular disease and even Alzheimer’s disease when therapy is started earlier.
What this means for women
“I think the takeaway is that our 40s to 50s is a time of drastic metabolic change, and also a time when many women do not make time for themselves or address their own health,” Dr. Pope says.
She recommends women talk to their doctors about MHT/HRT early, when they first notice symptoms of menopause… or even sooner. Starting the conversation ASAP can help women understand their options before symptoms arise and helping with staying on track with routine care.
“I would love to see women being afforded the opportunities to start MHT as well as engage in healthy preventive lifestyles, which include cancer screenings and vaccinations,” Dr. Pope says. “While so many women disengage from health care during this time because life might be at its busiest—they might be caring for children and their parents—this is the time to lean into your own health care to prevent chronic conditions in the future.”
About the expert
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