Researchers analyzed data from five previous studies to understand if using menopausal hormone therapy might affect a woman's chance of developing rheumatoid arthritis (RA). The studies followed postmenopausal women for a combined total of over 22 million person-years, looking at who used hormone therapy and who later developed RA.
They found that women using menopausal hormone therapy had a 15% higher rate of RA diagnosis compared to those not using it. The link was strongest for women currently using therapy and for those who had used it for four years or longer. The study did not report on specific safety concerns or side effects from the therapy itself.
It's important to know this was an observational analysis, meaning it can only show a link, not prove that hormone therapy causes RA. The actual increase in risk for any individual woman is likely very small. Women should discuss this information with their doctor as part of a personalized conversation about the benefits and risks of hormone therapy for their specific situation.