– Pregnant women should limit their caffeine intake, including from green tea. High caffeine consumption during pregnancy can increase the risk of miscarriage or low birth weight.

8. **Headaches**
– Some individuals may experience headaches due to the caffeine content in green tea, especially if consumed in large quantities or if you’re not accustomed to caffeine.

9. **Dizziness or Lightheadedness**
– For some people, especially those sensitive to caffeine or with low blood pressure, green tea may cause dizziness or lightheadedness when consumed in large amounts.

10. **Skin Reactions (from supplements)**
– Some people may experience allergic reactions or skin irritation due to green tea extract supplements. If you have a known allergy to tea, avoid using concentrated forms of green tea.

### **Conclusion**
Green tea offers a wide range of health benefits, from boosting metabolism and brain function to improving heart health and skin. However, like any supplement or food, moderation is key. Excessive consumption may lead to unwanted side effects, particularly due to caffeine or tannins. Always consult a healthcare provider if you have specific health concerns or are on medications. By drinking it in moderation, you can enjoy the many benefits green tea has to offer.