Hair dyes and breast cancer risk
This summary table contains detailed information about research studies. Summary tables are a useful way to look at the science behind many breast cancer guidelines and recommendations. However, to get the most out of the tables, it’s important to understand some key concepts. Learn how to read a research table.
Introduction: Research studies show the use of permanent hair dye does not increase the risk of breast cancer.
Learn more about hair dyes, hair relaxers and breast cancer risk.
Learn about the strengths and weaknesses of different types of studies.
See how this risk factor compares with other risk factors for breast cancer.
Study selection criteria: Prospective cohort studies and meta-analyses.
Table note: Relative risk above 1 indicates increased risk. Relative risk below 1 indicates decreased risk.
Relative Risk of Breast Cancer in Women who Ever Used Hair Dye Compared to Those who Never Used Hair Dye,
Prospective cohort studies
Cancer Prevention Study II (CPS-II) 
Nurses’ Health Study 
Shanghai Women’s Health Study 
Takkouche et al. 
14 studies including 680,633 women
NS = Not statistically significant
* Study results are from 2 study sites.
- Thun MJ, Altekruse SF, Namboodiri MM, et al. Hair dye use and risk of fatal cancer in U.S. women. J Natl Cancer Inst. 86(3):210-215, 1994.
- Green A, Willett WC, Colditz GA, et al. Use of permanent hair dyes and risk of breast cancer. J Natl Cancer Inst. 79(2):253-257, 1987.
- Mendelsohn JB, Li QZ, Ji BT, et al. Personal use of hair dye and cancer risk in a prospective cohort of Chinese women. Cancer Sci. 100(6):1088-91, 2009.
- Takkouche B, Etminan M, Montes-Martinez A. Personal use of hair dyes and risk of cancer: a meta-analysis. JAMA. 293(20):2516-25, 2005.