1. Menstruation

Menstrual blood contains relatively high levels of hemoglobin, plasma protein, and heme, so women during or after their period should eat foods rich in iron. However, tea contains more than 30% tannic acid, which hinders the intestinal mucosa's absorption and utilization of iron. In the intestines, it easily combines with iron molecules from food, forming a precipitate and preventing the blood-building effect.

2. Pregnancy

Tea contains a relatively high amount of caffeine. Drinking tea will increase the pregnant woman's heart rate, add to the burden on her heart and kidneys, increase urination, and may induce pregnancy toxemia, which is detrimental to the healthy development of the fetus.

3. Pre-labor:

Drinking tea during this period can cause palpitations and insomnia due to caffeine, leading to a decline in physical fitness. It may also cause the mother to become exhausted during delivery, with weak contractions, resulting in difficult labor.

4. Lactation

Tannic acid in tea is absorbed by the gastric mucosa and, after entering the bloodstream, has a constricting effect, inhibiting mammary gland secretion and causing lactation obstruction. Additionally, due to the stimulating effect of caffeine, the mother cannot get sufficient sleep, and the caffeine in the breast milk enters the infant's body, potentially causing intestinal spasms and unexplained crying in the baby. Heavy tea consumption during lactation can also lead to insufficient milk production, affecting the infant's health.

5. Menopause

Women begin to enter menopause around age 45. Besides dizziness and fatigue, they may experience tachycardia, emotional instability, sleep disturbances or insomnia, and menstrual dysfunction. Regularly drinking tea can aggravate these symptoms, making it more difficult to smoothly navigate the menopausal transition.