Tea is a rich source of a class of compounds called tannins. Tannins can bind to iron in certain foods, rendering it unavailable for absorption in your digestive tract
Tea leaves naturally contain caffeine. Overconsuming caffeine from tea, or any other source, may contribute to feelings of anxiety, stress, and restlessness
Melatonin is a hormone that signals your brain that it’s time to sleep. Some research suggests that caffeine may inhibit melatonin production, resulting in poor sleep quality
Certain compounds in tea may cause nausea, especially when consumed in large quantities or on an empty stomach.
Research suggests that caffeine can relax the sphincter that separates your esophagus from your stomach, allowing acidic stomach contents to more easily flow into the esophagus
Exposure to high levels of caffeine from beverages like tea during pregnancy may increase your risk of complications, such as miscarriage and low infant birth weight
Intermittent caffeine intake may help relieve certain types of headaches. However, when used chronically, the opposite effect can occur
Although feeling light-headed or dizzy is a less common side effect, it could be due to drinking too much caffeine from tea.