There are two main categories of herbs that cannot be used during menstruation: those with strong blood-activating and blood-breaking effects; and those of a cold nature. Some drugs that invigorate the blood and open the channels are best not used during menstruation, such as angelica, which may increase the amount of blood loss during menstruation. Especially if the menstrual flow itself is heavy, belonging to blood heat, qi deficiency can not take blood, similar to safflower, panax notoginseng, Chuanxiong and other drugs with blood activating effect should be cautious, but not can not be used, sometimes even if used, the body’s own regulatory ability is strong, there is no major harm. Cold medicines, such as herbs for colds and fires, which have the effect of clearing heat and detoxifying the body, are cooling and may cause cold in the uterus and abdominal pain, and it is best to stop using them for a few days first during your period. If the symptom symptoms are heavy, you should also warm your stomach after taking it to avoid causing uterine cold. As for other tonic medicines, such as tonics, ginseng and spleen pills, etc., they generally do not have an effect on menstruation, but medicines of a hot nature, used during menstruation, may cause blood heat, so they should be used with caution.