It is generally not recommended to drink tea during menstruation, especially strong tea. Because tea contains caffeine, alkaloids, tannic acid, etc., drinking during menstruation may cause nerve excitement, which may prevent women from getting enough rest during menstruation, thus aggravating dysmenorrhea, and can also hinder the absorption of iron. 1, hinder the absorption of iron: women during menstruation endometrial shedding, vaginal bleeding can occur, at this time, a large amount of iron will also be in a state of loss with the outflow of blood. Tea is rich in tannic acid, this substance will combine with the iron molecules in food, thus forming a large number of precipitates, and further impede the absorption of iron molecules in the intestinal mucosa, which in turn makes the body to reduce the absorption of iron, and in serious cases can lead to iron deficiency anemia in women’s menstrual period; 2, affect sleep: tea and caffeine, alkaloids and other excitatory substances, drinking too much can lead to insomnia, poor rest etc. If women have menstrual syndrome, excessive consumption of tea may aggravate symptoms such as distraction and insomnia; 3, aggravate dysmenorrhea: some tea is a cool drink, such as green tea, excessive consumption may cause aggravation of dysmenorrhea. In general, during menstruation, you should pay attention to a light diet, avoid cold, spicy and stimulating foods, avoid drinking strong tea, coffee and other nerve-exciting drinks, and supplement iron-rich foods, such as animal liver and black fungus, to prevent iron deficiency anemia.