Women who use chemical hair straighteners and relaxers may have a higher risk of uterine cancer, according to a new study from researchers at the US National Institutes of Health (NIH). The study findings were published on October 17, 2022, in the Journal of the National Cancer Institute. Data was collected from 33,497 women in the US, aged 35-74 participating in an ongoing sister study for risk factors for breast and uterine cancer etc. The women were investigated by NIH for effect of using hair products e.g. hair dyes, straighteners, relaxers, or perms etc. over the previous year.