Cancer Home > Green Tea Side Effects
Although most people do not experience problems while taking green tea, the caffeine content of the beverage (or supplement) could cause side effects to occur. Some of the bothersome but usually not dangerous side effects include gas, nausea, restlessness, and frequent urination. Some of the potentially serious side effects of green tea include high blood pressure, anxiety, or difficulty breathing.
- Abdominal bloating and gas
- Frequent urination.
- High blood pressure (hypertension)
- A rapid heart rate (tachycardia)
- Rapid breathing or difficulty breathing
- Anxiety or agitation
- An irregular heart rhythm (arrhythmia)
- Feelings of a rapidly or forcefully beating heart (known as heart palpitations)
- Signs of an allergic reaction, including an unexplained rash, hives, itching, swelling of the mouth or throat, wheezing, or difficulty breathing or swallowing.