1: 1. Stomach Issues: Green tea can cause stomach upset, nausea, and diarrhea in some people.

2: 2. Caffeine Sensitivity: High levels of caffeine in green tea can lead to insomnia, anxiety, and jitteriness.

3: 3. Iron Absorption: Green tea can hinder iron absorption, leading to anemia in some individuals.

4: 4. Liver Damage: Excessive consumption of green tea extract supplements may result in liver injury.

5: 5. Drug Interactions: Green tea may interact with medications, affecting their effectiveness and causing side effects.

6: 6. Headaches: Some people may experience headaches as a side effect of consuming green tea regularly.

7: 7. Osteoporosis Risk: Excessive consumption of green tea can hinder calcium absorption, increasing the risk of osteoporosis.

8: 8. Pregnancy Complications: Pregnant women should limit their green tea intake due to potential side effects on fetal development.

9: 9. Allergic Reactions: Some individuals may be allergic to green tea, experiencing symptoms like hives, itching, or swelling.