Generally speaking, taking qi and blood-activating herbs and cold herbs may have an effect on menstruation, but it is not absolute, and is also related to a woman’s physical condition and the nature of the medicine. 1. Chinese herbs that move qi and blood: These herbs (e.g. Rhizoma Ligustici Chuanxiong, Angelica Sinensis, etc.) may promote the operation of qi and blood, and may even lead to early menstruation or excessive bleeding, so it is not recommended to take these herbs when menstruation is heavy or prolonged. 2. Cold herbs: These herbs (e.g. honeysuckle, burdock, etc.) tend to cause coldness in the uterus, or even stagnation of the blood, resulting in delayed menstruation, so it is not recommended to take these herbs if you have a heavy menstrual flow or prolonged menstruation. It is important to note that if you experience discomfort during menstruation, you should seek medical advice. In addition, during menstruation, medication should be used or not used under the guidance of a doctor, and the adverse effects of blindly using medication should be avoided.