Experts do not recommend drinking tea before going to bed because of the caffeine contained in tea. It can cause migraines due to vasoconstriction. In addition, caffeine promotes the production of adrenaline, which has an invigorating effect.

Drinking hot black tea is strictly contraindicated for hypertensive patients, it can cause an attack of hypertension. They are recommended to opt for cooled green tea, writes RuNews24.ru.

Tea is not recommended for children under two years of age and pregnant women, because tea enzymes do not allow folic acid to be absorbed.

People with gastrointestinal problems should stay away from fermented tea.

Tea contains oxalates, which can cause kidney stones to form.

You should also drink herbal teas with caution, they can provoke allergic reactions.