You can’t drink green tea during menstruation. Green tea contains a lot of tannins, which can combine with iron to form a waste product that is not easily absorbed, affecting the absorption of iron; and when a woman is menstruating, she will lose a large amount of blood, thus losing a large amount of iron, and she needs to take iron supplements from food to replenish the iron that she loses due to menstrual bleeding. If you drink green tea during menstruation, it will affect the iron supplementation, easy to cause the occurrence of anemia. Green tea also has the effect of stimulating the nerves, easy to lead to insomnia, and women in the menstrual period, it is necessary to ensure adequate rest and sufficient sleep. If you drink green tea will also make women insomnia, resulting in weakness and decreased resistance, easy to catch a cold, cold or cause other diseases, affecting the health of the body.