2024-03-05 05:32:00
[Cancer/Bladder Cancer/Hair Dyeing/Hair Dye/Grey Hair]Bladder cancer is one of the common cancers in Hong Kong, with regarding 400 new cases every year. Since early symptoms are not obvious, many patients are often diagnosed with cancer only following obvious signs of hematuria. A doctor in Taiwan shared a case earlier, saying that a 60-year-old female patient suffered from bladder cancer. The cause may be related to long-term hair dyeing. TOPick also interviewed urologists in Hong Kong to debunk some myths that hair dye causes cancer.
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Taiwan’s program “Health 2.0” earlier invited Gui Jiahao, a urologist from Gengshin Hospital, to share a case involving a 60-year-old woman who was diagnosed with bladder cancer and dyed her hair non-stop since she was 20 years old because of her greed for beauty. Gui Jiahao speculated that the female patient’s 40-year hair dyeing habit may be the cause of her cancer.
Gui Jiahao further explained that hair dyes are mostly water-soluble and can melt in the blood. After being metabolized by the kidneys, they dissolve in the urine, which will affect bladder health over time. The tricky thing regarding bladder cancer is that many cancers have tumor markers that can be detected through blood tests, but bladder cancer does not. Therefore, it may be too late to check when hematuria occurs.
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Taiwanese family medicine physician Wang Jianyu also shared in the program the three major risk factors for bladder cancer,2 including hair dyeing, food pigments and environmental hormones. He also pointed out that when dyeing hair, one should avoid letting the pigment come into contact with the scalp because water-soluble chemicals can affect the urinary system. Food pigments and environmental hormones are both high-risk factors for bladder cancer. Therefore, you should mainly eat original foods in your daily life to reduce pigment absorption; drink more water and urinate more to reduce the risk of bladder cancer.
Do hair dyes contain carcinogens?
Many people also have the habit of dyeing their hair. Hong Kong urologist Dr. Wong Kwok-tin once shared in an interview that hair dyes must contain dyes. One of them is called azo dye (Azodye). In the 1980s, medical research found that it will decompose It forms the carcinogen benzidine, which can cause cancers such as bladder cancer, breast cancer, and blood cancer.
However, Huang Guotian continued to point out that Azodye has been banned from use as a dye for clothing, cloth, leather and hair dye in many countries since the 1990s. Currently, the EU, China, Japan, the United States, and even India, Vietnam and other places have legal regulations. These ingredients must not be added.
The darker the hair dye, the higher the risk
Wong Kwok-tin continued to point out that in fact, whether the dyes in hair dyes are carcinogenic depends on the substances and their contents. He believes that most of the current qualified hair dyes should theoretically not contain carcinogens and the dye content should not be too heavy. But he reminded that the darker the hair dye, the higher the chance of containing carcinogens, so special attention is needed. In addition, Huang Guotian also suggested that when choosing hair dye, do not choose products without brands. It is best to pay attention to whether they are certified by reliable organizations, such as the European Union, the United States Food and Drug Administration (FDA) and other agencies.
Taiwanese surgeon Jiang Kunjun has also suggested that you should avoid dark brown and black hair dyes because dark dyes contain more p-phenylenediamine (PPD), and some heavy metals are added to give the dye color. In addition to having more PPD, dark dyes usually have higher heavy metal content. Therefore, it is recommended to try to dye your hair with light colors, which may slightly reduce your exposure to PPD and heavy metals.
[Featured at the same show]7 hair dyes that do not contain heavy metal sensitizing ingredients
The Consumer Council has tested 26 hair dyes on the market that claim to have “natural” ingredients, and 7 of them received 5-star ratings. All of them do not contain allergenic substances, heavy metals, bacteria or mold. Click on the image below to view:
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Editor in charge: Luo Jiaxin
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