Women who frequently use these products are twice as likely to develop uterine cancer as others, according to a study published Monday.

Straightening products used to straighten hair, especially by black women, pose an increased risk of cancer of the uterus (especially endometrial cancer, not to be confused with cancer of the cervix), according to a new study by the American Institutes of Health.

“We estimate that 1.64% of women who have never used a hair straightening product will have developed uterine cancer by their 70s, but for frequent users this risk rises to 4.05%,” said Alexandra White, lead author of this study , in a press release, published in Journal of the National Cancer Institute.

“The doubling of this rate is worrying,” she added, but “it’s important to put this information in context, uterine cancer is a relatively rare form of cancer.” It accounts for about 3% of new cancer cases in the United States.

An 11-year study

The study is based on data from nearly 33,500 American women, followed over nearly 11 years. “Because black women use hair straightening or hair straightening products more frequently and tend to start younger (…), these results could be particularly interesting for them”, emphasized Che-Jung Chang, co-author of these jobs.

In this study, about 60% of women who reported using hair straightening products in the past year identified as black.

Compared to other beauty products, hair straightening products can promote the absorption of chemicals through lesions or burns caused by the scalp or by joint use of straighteners, the heat of which breaks down the chemicals. , the study notes.

Previous work with a similar cohort of women had already raised a link between slackers and increased risk of breast cancer. But the researchers point out that more research is needed to specifically determine which products may be associated with an increased risk of cancer.