Dizziness

Although feeling light-headed or dizzy is a rare adverse effect, it might be caused by consuming too much caffeine in tea. This condition is often linked with high caffeine levels, typically higher than 400-500 mg, or 6-12 cups (1.4-2.8 liters) of tea. However, it is possible that it will occur with lower dosages in persons who are very sensitive.

It is not encouraged to drink so much tea in one sitting. If you frequently feel dizzy after drinking tea, use a reduced caffeine version or visit your healthcare professional. Large doses of caffeine in tea can cause dizziness. This particular side effect is less common than others and usually only occurs if your intake exceeds 6–12 cups (1.4–2.8 liters).