The incidence rate of breast cancer has risen due to factors including earlier puberty, longer menstruating years, fewer children, and shorter nursing durations.

“there has been over the past decades a rise in the incidence of breast cancer the rate of breast cancer and one of the likely contributors relates to both the early uh puberty that we are now seeing in women um girls are starting to menstruate at a far younger age um in the 2020s than they were a 100 years ago or certainly 150 years ago owing probably to better nutrition uh and better General Health and that u means that the breast development and the exposure of the breast to estrogens starts earlier and women are also menstrating for longer again largely owing to Better Health and women are having at the population level in the developed countries at least fewer children and they tend to nurse those children for a shorter duration of time”