During menstruation is not recommended to drink tea, especially strong tea, because tea contains a large amount of tannic acid, which can affect the absorption of iron. During the menstrual period there is a lot of bleeding, if the absorption of iron is reduced, it is likely to aggravate the symptoms of anemia. Drinking tea during menstruation may also aggravate female constipation, because during menstruation, luteinizing hormone secretion has changed, many people will be constipated, the lactic acid in tea will slow down the peristalsis of the intestines. Drinking tea may also aggravate women’s dysmenorrhea and back pain, which can affect women’s sleep, so it is not recommended to drink tea during menstruation, you need to eat foods high in iron and easy to digest to prevent the occurrence of anemia.