It is not possible to drink green tea during menstruation. Green tea contains a lot of tannic acid, which can be combined with iron, forming a waste product that is not easily absorbed, affecting the absorption of iron; and when women have their periods, they will lose a lot of blood, thus losing a lot of iron, and need to take iron from food to replenish the iron lost by the body due to menstrual bleeding. If you drink green tea during menstruation, it will affect the replenishment of iron, which can easily cause anemia. Green tea also has a stimulating effect on the nerves, which can easily lead to insomnia, and women need to ensure adequate rest and sufficient sleep during menstruation. If you drink green tea will also make women insomnia, resulting in weakness resistance, easy to catch cold, cold or cause other diseases, affecting health.