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 »

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 »

Possible side effects associated with kombucha tea include nausea, vomiting, head and neck pain, allergic reactions, and abdominal discomfort, notes WebMD. The dangers of the tea come from the fact that it is often made ... More »

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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 »

www.reference.com Food Beverages Coffee & Tea

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 »

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 »

Side effects from drinking ginger tea may include mouth irritation, heartburn, gas and upset stomach, and it can also increase the risk of bleeding in those who have bleeding disorders. Consuming ginger tea with less tha... More »