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WHI strives to improve health through research on risk factors, prevention, and early detection of serious health conditions, so postmenopausal women thrive.

Diagnostic-grade calculators designed to give you clarity. Built on peer-reviewed algorithms and rigorously tested by medical professionals.
Predict your next period with clinical accuracy using your unique cycle history.
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Specialized calculation for IVF pregnancies tailored to transfer type.
Medically reviewed articles deconstructing complex health topics.

Nearly 80% of autoimmune disease patients are women, and the average diagnosis takes 4.6 years. Here is what the data shows about lupus, MS, Hashimoto's, and the $100 billion annual cost burden.

The 5-year survival rate for breast cancer caught early is 99%. Caught late, it drops to 31%. Here is what the latest screening, incidence, and disparity data tells us about where we stand and what still needs to change.

HPV causes 99% of cervical cancers, and the HPV vaccine reduces cervical cancer risk by 87% in vaccinated women. Here is what the latest data says about screening, vaccination rates, and the WHO's elimination target.

About 190 million women worldwide have endometriosis, but the average patient waits 4 to 11 years for a diagnosis. Here is what the latest research data tells us about who gets endometriosis, how it is treated, and why it remains chronically underfunded.

Peak fertility occurs between ages 20 and 24, and by 40 the chance of conception per cycle drops to about 5%. Here is what CDC, WHO, and clinical data tell us about age-related fertility decline, egg freezing, and IVF outcomes.

Gestational diabetes affects 2% to 10% of U.S. pregnancies, and about 50% of women who develop it go on to get type 2 diabetes within 10 years. Here is what the latest data tells us about who is affected and why rates keep rising.

Cardiovascular disease killed 446,912 U.S. women in 2022. Nearly 45% of women over 20 have some form of CVD, yet most still think of heart disease as a men's problem. Here is what the latest data tells us.

Nearly 30% of reproductive-age women worldwide are anemic, and women are 5x more likely than men to be iron deficient. Here is what the data says about symptoms, thresholds, and why so many cases are missed.

The CDC found 87% of U.S. pregnancy-related deaths are preventable. With 908 deaths in 2021 and Black women dying at 3x the rate, here is what the data reveals about maternal mortality and what must change.

About 1.3 million U.S. women enter menopause each year, but only 4-5% of eligible women use hormone therapy. Here is what the WHI study actually found, what has changed since, and why the treatment gap persists.

80% of osteoporosis patients are women, and 1 in 2 women over 50 will break a bone due to bone loss. Here is what the data says about bone density, fracture risk, prevention, and the $19 billion annual cost of osteoporotic fractures.

PCOS affects 6-12% of U.S. women, but up to 70% remain undiagnosed. Here is what the latest data shows about prevalence, healthcare costs, metabolic risks, and the research funding gap for the most common hormonal disorder in women.

1 in 7 new mothers develops postpartum depression, and roughly half go undiagnosed. Here is what the latest data on prevalence, maternal suicide, treatment gaps, and the first oral medication tells us.

Preeclampsia affects 2–8% of pregnancies globally and is a leading cause of maternal death. Black women face 60% higher risk. Here is what the data says about screening, aspirin prophylaxis, and long-term cardiovascular consequences.

Chlamydia alone accounts for 1.8 million reported cases per year, and women bear disproportionate long-term consequences including PID and infertility. Here is what the latest CDC surveillance data tells us.

Women are 40% more likely to have insomnia than men, and the risk spikes during pregnancy and menopause. Here is what the research says about hormones, sleep apnea underdiagnosis, and the real cost of lost sleep.

Women are 5 to 8 times more likely than men to have thyroid disease, and 60% of those affected don't know it. Here is what the data says about prevalence, Hashimoto's, the fertility connection, and why so many cases go undiagnosed.

50–60% of women will get at least one UTI in their lifetime, and 27% will have a recurrence within 6 months. Here is what the data says about causes, antibiotic resistance, and evidence-based prevention.

36% of U.S. counties have no hospital obstetric services. Here is what the data says about insurance gaps, maternity care deserts, and the cost barriers keeping millions of women from basic care.

Women are twice as likely as men to experience depression, and 56% of women with depression globally go untreated. Here is what the latest WHO, NIMH, and pandemic-era data tells us about anxiety, depression, and the treatment gap.

About 25% of pregnant women experience implantation bleeding, but telling it apart from an early period can be difficult. Here is what the clinical evidence says about timing, color, duration, and the warning signs that require medical attention.

A late period causes immediate anxiety, but pregnancy is only one explanation. Stress, thyroid disorders, PCOS, weight changes, and several other factors disrupt the menstrual cycle. Here is what the data says about each cause, how common it is, and when delayed periods require medical evaluation.

Up to 70% of women with PCOS have insulin resistance, and dietary changes are a first-line treatment. Here is what the research shows about low-glycemic eating, anti-inflammatory diets, specific nutrients, and the meal patterns that improve symptoms — and what has been overhyped.

Perimenopause lasts 4 to 8 years on average, begins in the mid-40s, and produces symptoms that go far beyond hot flashes. Here is what the clinical data shows about symptom prevalence, when to expect what, and which management strategies have evidence behind them.

Ovulation lasts only 12 to 24 hours, but the fertile window spans about 6 days. Cervical mucus changes, basal body temperature shifts, and ovulation pain are the most evidence-backed signs. Here is what the research says about each one, how reliable they are, and how to use them whether you are trying to conceive or avoid pregnancy.

75% of women will have at least one yeast infection in their lifetime, and 40–45% will have two or more. Here is what the clinical data shows about symptoms, the most effective treatments, why recurrence happens, and which prevention strategies actually work.
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