Excessive use of tea can result in increased blood pressure, heart rate as well as constipation. There are numerous varieties of tea, such as black tea and green tea, which are the products of the Camellia sinensis plant... More »

Three ingredients in Fit Tea contain caffeine, side effects of which may include irritability, sleeplessness and diarrhea. Higher doses of caffeine may worsen pre-existing conditions such as depression, panic disorder an... More »

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Drinking green tea is beneficial for lowering cholesterol levels and maintaining mental alertness. The antioxidant in green tea, catechin, is responsible for lowering cholesterol, while caffeine improves mental performan... More »

Side effects of Cho-Wa tea are a rapid heart rate, high blood pressure and the inability to sit still. These are caused by the amount of caffeine present in it's main ingredient, green tea. Cho-Wa tea should not be consu... More »

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Side effects of matcha green tea may include stomach upset and constipation. This tea has a high caffeine content, and the National Institutes of Health recommends against drinking more than five cups a day. More »

Drinking oolong tea can cause headaches, nervousness, sleep problems, vomiting and diarrhea, according to WebMD. It can also cause irritability and confusion. These side effects are due to the caffeine content of the tea... More »

Side effects of drinking decaffeinated tea include headache, dizziness, itching and feeling faint. Decaffeinated tea undergoes a chemical treatment process during production that eliminates caffeine from the beverage. So... More »