Washing hair with hot water during menstruation is generally not harmful, while washing hair with cold water during menstruation may be prone to catching colds and headaches. If a woman washes her hair with hot water during menstruation and turns on the hair dryer in time after washing her hair, it is generally not harmful and women can wash their hair without worry. If a woman washes her hair with cold water during menstruation, the blood circulation to the brain will be slowed down, and with the stimulation of cold water, the woman’s head may get cold and cause cold and flu symptoms. In addition, if you do not dry your hair in time after washing your hair, you can sleep with wet hair directly on your pillow, which may easily cause headaches and make you dizzy the next day. Therefore, if women need to wash their hair during menstruation, it is recommended that they use hot water to wash their hair and dry it in time after washing.