https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5182227/ HRT can increase your risk of breast cancer. This study is referring to menopausal, cisgender, biological, women. It shows a 2.3% increase of the risk of breast cancer for each year of use. Direct Quotes: As for the potential adverse effects on cancer risk, most information on HRT and breast cancer is included in a re-analysis of individual data from 51 epidemiological studies (including over 90% of the world's data), showing a 2.3% increase of the relative risk of breast cancer for each year of use which, however, levels off after stopping use. This corresponds to a cumulative excess of approximately 2 in 1,000 women who started taking HRT at age 50 and used it for 5 years, 6 in 1,000 women who used it for 10 years and 12 in 1,000 women who used it for 15 years. The data on epithelial ovarian cancer allows exclusion of any strong association with HRT, although a moderate positive relationship remains open to debate. As for othe...