You should not dye your hair during menstruation, although menstruation is a normal physiological phenomenon, but the body resistance and immunity is reduced. If you dye your hair during menstruation, the hair dye contains dioxin, a carcinogenic substance recognized worldwide, which is likely to enter the blood circulation along the scalp and cause great harm to the body clinically. In addition, you should not perm your hair during your menstrual period. The same reasoning applies to perming, which can also cause harm to your body, so it is recommended that if you want to dye or perm your hair, it is best to do it during non-menstrual periods to reduce the damage to your body. It is also important to keep warm during the menstrual period, not to eat cold food, and not to drink alcohol.