It is not recommended to drink green tea during menstruation, because green tea is cold and can easily cause cold and abdominal pain when taken during menstruation, and can also cause dysmenorrhea due to cold in the uterus. Green tea contains tannic acid, which can react with iron in food and cause precipitation, which can lead to iron not being absorbed by the body and cause iron deficiency anemia. During menstruation, blood loss can lead to anemia, and drinking green tea can aggravate the symptoms of anemia, easily causing dizziness, pale face and other phenomena, and also cause general weakness. The tannic acid in green tea can also aggravate the symptoms of menstrual constipation, green tea contains substances such as caffeine, which can increase excitability and can aggravate headaches, dizziness, insomnia and other conditions. During menstruation can be appropriate to drink black tea, black tea is warm, will not cause cold, leading to dysmenorrhea, but note that you can not drink strong tea. You need to drink freshly squeezed juice during your period, which can be supplemented with vitamins and has certain benefits for your body.