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Is Use of Lye-Based Hair Relaxers Linked to a Higher Risk of Breast Cancer?


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This article is republished here with permission from The Conversation. This content is shared here because the topic may interest Snopes readers; it does not, however, represent the work of Snopes fact-checkers or editors.
Frequent and long-term use of lye-based hair straightening products, or relaxers, may increase the risk of breast cancer among Black women, compared with more moderate use.
Boston University’s Black Women’s Health Study followed 59,000 self-identified African American women for over 25 years, sending questionnaires every two years on new diagnoses and factors that might influence their health.
The minimal association between hair relaxers (with or without lye) and breast cancer risk for moderate users is generally reassuring. But the elevated risk for the heaviest users of lye-based hair products – which included about 20% of study participants – is concerning. ....

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Moderate use of hair relaxers does not increase breast cancer risk among black women


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New study fills an important knowledge gap about the potential health effects of hair relaxers commonly used by Black women.
(Boston) The lifetime risk of breast cancer is similar among Black and white women in the U.S., but Black women are disproportionately affected by aggressive breast cancer subtypes such as estrogen receptor (ER) negative tumors, which are diagnosed at a younger age and have a higher mortality rate. While certain hair care products, including relaxers (straighteners) and leave-in conditioners, used more commonly by Black than white women may contain compounds with estrogens or endocrine-disrupting chemicals, few epidemiologic studies have assessed the relationship of hair relaxer use to breast cancer risk. ....

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