1. Relieve dysmenorrhea: Black tea is rich in tannic acid and caffeine, which can help relieve dysmenorrhea and relieve pain and discomfort.

2. Regulate menstrual cycle: substances such as catechins in black tea can regulate women's hormone secretion, help regulate menstrual cycle and make menstruation more regular.

3. Supplement the nutrients needed by the body: Women are prone to blood loss during menstruation. The vitamins, minerals and other ingredients rich in black tea can supplement the nutrients needed by the body and enhance the body's immunity.

4. Relieve mood swings: During menstruation, women's mood swings are relatively large, and tea polyphenols in black tea can relieve emotions and make the body more comfortable.

It should be noted that although black tea has the above-mentioned effects, women should not drink too much during menstruation to avoid physical discomfort. It is recommended to drink in moderation, two cups a day is appropriate.