频繁染发，小心伤肾

Core Viewpoint - The article discusses the health risks associated with frequent hair dyeing, particularly the potential link to kidney diseases, as highlighted by a recent case of a young girl diagnosed with purpura nephritis after frequent dyeing [1] Health Risks of Hair Dyeing - Hair dyes often contain para-phenylenediamine, a chemical that can enter the bloodstream through the scalp and skin, increasing the burden on the kidneys [2] - Long-term exposure to such chemicals can damage kidney cells, leading to inflammation and impaired kidney function [2] - Some hair dyes may contain heavy metals like lead, which can also harm kidney health when metabolized [2] - Individuals with pre-existing mild kidney dysfunction may experience accelerated kidney disease progression due to frequent exposure to hair dye chemicals [2] Allergic Reactions and Other Risks - Symptoms of allergic reactions to hair dyes can include scalp redness, itching, and more severe reactions like swelling and blisters [3] - Even natural or ammonia-free dyes can cause allergic reactions, particularly in individuals with sensitive skin [3] - Frequent use of hair dyes can damage hair quality, making it dry and prone to breakage [3] - Some dyes may release volatile organic compounds that can irritate the respiratory system during application [3] Recommendations for Safer Hair Dyeing - Experts recommend limiting hair dyeing to no more than four times a year and avoiding simultaneous dyeing and perming [4] - Consumers should avoid "three-no" products and be cautious of marketing claims regarding "natural" or "plant-based" dyes, as they may still contain harmful chemicals [4] - Conducting a patch test before dyeing is essential to check for allergic reactions [5] - It is advised to avoid direct contact of dye with the scalp and to use protective barriers like lotion or petroleum jelly [5] - Individuals with a history of allergies, skin damage, or certain health conditions should consult a doctor before dyeing [5] - Temporary dye products or wigs may be safer alternatives for those who frequently change hair color [5]