It is best not to dye and perm hair during physiological period, because when women are in physiological period, their resistance is weaker and their skin is easy to be allergic, and contact with hair dyes may trigger allergy. During the physiological period of women, the endometrium undergoes cyclic exfoliation and bleeding, the general immune system will decline, and the ability to resist bacteria and viruses will be weakened, and skin sensitivity will increase as a result. Hair dye contains a large number of chemical components, such as oxidizing substances, aniline substances, etc. Hair dye components may trigger allergic reactions, so it is best not to dye hair perm during physiological period. During the physiological period, women are forbidden to have sex and ensure a healthy diet and lifestyle to minimize a variety of diseases that may be triggered by the weakening of resistance during the physiological period. In addition, when dyeing hair, you should also pay attention to try to choose the regular qualified brand, to reduce the heavy metals and other undesirable ingredients on the human body damage. If women feel uncomfortable during the physiological period, or feel abnormal after hair coloring and perming, they should consult a doctor in time, and do not use medication on their own, so as not to delay their condition.