An oncologist warns that frequent use of chemical hair straighteners may increase the risk of uterine cancer. Studies suggest frequent users face a lifetime risk of 4.05%, compared to 1.64% for non-users. Chemicals like formaldehyde, parabens, and phthalates found in these products are believed to disrupt hormones and are linked to cancer. The US FDA has also cautioned about hair treatment risks, particularly in regions like India where these treatments are popular.