Angelica sinensis has the effects of activating blood circulation and relieving pain (relieving pain by removing blood stasis), tonifying blood and regulating menstruation, and moistening the intestines and laxatives. Therefore, the danger of drinking angelica water during menstruation is that it may cause increased menstrual flow and prolonged menstrual period. If the amount of menstruation is normal or the amount of menstruation is already relatively high, taking angelica water during menstruation may cause increased menstrual flow, prolonged menstrual period, etc.. Angelica sinensis is used for treating blood deficiency and atrophy, irregular menstruation, dysmenorrhea, blood deficiency, blood stagnation, blood cold pains, bruises, rheumatism paralysis, carbuncle and gangrene (a kind of venomous sores, occurring on the surface of the body, limbs, internal organs of the acute suppurative disease) sores, intestinal dryness constipation and so on. It should not be taken by patients suffering from fever and bleeding, and should be taken with caution by people suffering from dampness and fullness in the middle of the body (too much dampness leading to fullness and discomfort in the spleen and stomach) and people suffering from loose stools. If you need to use Angelica water, it is recommended to use it under the guidance of a professional doctor.