In order to look younger, 63-year-old Aunt Liu wanted to dye all the white hair on her head black, but she felt that it was too expensive to dye her hair at the barbershop, so she bought black hair dye and went home to ask her daughter Ms. Wang to help.
Mom, I saw an article a few days ago that black hair dye is more likely to cause cancer than other colors, for the sake of health, why don't we dye it? It's pretty good now! Ms. Wang worriedly persuaded Aunt Liu.
Many people in our community who are about the same age as me are dyed like this, and they are all fine, okay. Aunt Liu didn't take her daughter's words to heart. But Ms. Wang insisted on not helping Aunt Liu dye her hair, and finally broke up unhappily.
Afterwards, Aunt Liu felt guilty and knew that her daughter also cared about herself, so she opened her mobile phone with doubts to search:"Is long-term hair dyeing really easy to cause cancer? Is black hair dye more harmful to the body? ”
1. Does long-term hair dye cause cancer? Authoritative research answers.
Is it true that the International Agency for Research on Cancer (IARC) classifies occupational exposure to hair dye as a group 2A carcinogen that may cause cancer, which raises health concerns about hair dyeing?
The British Medical Journal published a study on the relationship between the use of permanent hair dye and cancer risk, with a total of 121,700 participants, mainly women aged 30-55 years**, and the researchers regularly sent questionnaires to the participants to collect the data needed for the survey, and the questionnaire response rate reached 90%. Through data analysis, it was found that hair dye increased the incidence of basal cell carcinoma, ovarian cancer, breast cancer and other cancers, and did not have a great impact on other types of tumors such as lung cancer and kidney cancer. Studies have shown that:There is no significant causal relationship between frequent use of permanent hair dye and most increased risk of cancer
That being the caseSo why is hair dye considered to be carcinogenic?
This is mainly due to the fact that the hair dye contains a substance called "p-phenylenediamine", which has a long-lasting effect on color fixing and can make hair coloring better. In 2017, the World Health Organization's International Agency for Research on Cancer will:P-phenylenediamine is defined as a Group 3 carcinogen, that is, regular exposure to p-phenylenediamine will have a certain risk of causing cancer.
There are also some studies that p-phenylenediamine will be absorbed by the body through **, inhalation and other ways and accumulate in the body, which may increase the risk of leukemia, bladder cancer, breast cancer and other cancers.
Therefore, occasional hair dyeing may not cause cancer, but the hidden carcinogenic potential should not be ignored.
2. Black hair dye has the greatest risk of causing cancer, is it really fake?
A study in the British Medical Journal found that women with black hair naturally had an increased risk of Hodgkin lymphoma and women with lighter natural hair color had a higher risk of basal cell carcinoma.
Dr. Li Xinquan, director of the hematology department of the Beijing Armed Police General Hospital, pointed out that hair dye contains harmful p-phenylenediamine, and some substandard products also contain heavy metals such as lead and mercury. P-phenylenediamine can penetrate into the scalp with hair dye, enter the capillaries, accumulate in the body, and reach the bone marrow through blood circulation, causing cancer. Among them, black hair dye has higher content of p-phenylenediamine and heavy metals than other color hair dyes, therefore, black hair dye has a greater risk of carcinogenicity.
There is another way of saying about hair dye:Is it true that the lighter the color of the hair dye, the more damage to the human body?
Dyeing blonde hair is different from dyeing black hair, in order to make the hair color appear, you need to add an extra step before dyeing - bleaching, that is, the melanin of the hair is "bleached" before coloring. The lighter the color of the dyed hair and the longer the bleaching time, the more the hair dye will come into contact with the scalp, causing harmful substances to seep in.
Zhang Jianglin, chief physician of the ** Department of Xiangya Hospital of Central South University, said that when dyeing very light hair, it is necessary to use a highly oxidizing hair dye to bleach, and the longer the hair bleaching, the damage to the human body will also increase.
3. How much damage does frequent hair dye cause? It must not be overlooked.
The beauty of dyed hair is temporary, but the damage behind it is irreparable!
1) Hair loss. Long-term and frequent hair coloring can greatly increase the risk of hair loss. On the one hand, hair dye contains a large number of highly irritating chemicals, which can irritate the scalp and trigger inflammation of hair follicles, which can lead to hair follicle shrinkage and hair loss in the long run. On the other hand, frequent hair coloring can lead to an imbalance in hair moisture, resulting in dryness, frizziness, breakage and other problems, which are difficult to recover once the hair is damaged.
2) Dermatitis. People with allergies are prone to contact dermatitis during the hair dyeing process. One is that the chemicals in the hair dye are too irritating, which will cause allergic reactions after contact, and the other is that the improper use of hair dye will lead to contact dermatitis, such as too much use, too long stay time, and too many times of use.
3) Breast cancer.
An eight-year study in the International Journal of Cancer found a significant relationship between the risk of breast cancer and the use of straighteners and permanent hair dyes. Women who regularly use permanent hair dye have a 9% higher risk of breast cancer than those who don't.
A study in the British Medical Journal confirmed that the use of permanent hair dye was associated with an increased risk of breast cancer, ovarian cancer, lymphoma, and ** cancer, and that the higher the amount of hair dye used, the higher the incidence. The reason for this is that hair dye contains aromatic amines, a class I carcinogen, which can reach the breast tissue. Long-term use of hair color products can increase the risk of breast cancer.
4. Keep these 3 points in mind to make hair dye safer.
1) Hair dye selection: quality first.
According to China's Regulations on the Hygiene Supervision of Cosmetics, hair dye products are one of the nine categories of special-purpose cosmetics and must obtain a special-purpose cosmetics approval number before they can be produced and sold. Consumers should choose hair dye products produced by regular manufacturers or well-known brands, check whether there is a "national makeup special character" logo on the packaging box when purchasing, whether there is a production batch number, and do not believe unlicensed or falsely advertised hair dyes. It will be safer to use the best quality hair dye ingredients, and the content of harmful substances will be less, and the harm to the body will be less.
2) Hair dyeing method: test first, then dye, and wash more.
Before dyeing your hair, you need to do an allergy test, take a small amount of hair dye and apply it to the back of your ears** or the inside of your wrist, and observe whether there are symptoms such as redness, swelling, itching, and allergies within 24 hours. In the process of dyeing hair, a variety of hair dyes should not be mixed to prevent chemical reactions between hair dyes and the formation of new harmful substances that will cause harm to the body. After dyeing your hair, you need to rinse several times to wash off the residual hair dye, and then take care of the scalp to soothe the irritation of the hair dye on the scalp.
3) Frequency of hair coloring: less than twice a year.
It takes half a year to a year for the chemicals in hair dye to be completely eliminated by the human body, so the frequency of hair dyeing should not be too much, generally no more than twice a year.
Hair dyeing doesn't necessarily cause cancer, but for the sake of your body, you should still dye your hair in moderation and don't give up your permanent health for the sake of a short-term glow.
References: 1] "Don't dye your hair more than this number of times a year, it won't cause cancer".She knows Tencent Medical Codex. 2023-11-06
2] "Frequent hair dyeing can cause cancer, is it true or fake? See what these studies sayAcademic longitude and latitude. 2023-06-18
3] "Are hair dyes carcinogenic? What is the difference between dozens and hundreds of pieces of hair dye? 》.A new perspective on medicine. 2023-02-13
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