Although green tea is regarded as one of the healthiest drinks ever, it does have some negative effects.

According to studies, green tea should be avoided by anyone who has heart illness because it can lead to irregular pulse.

Green tea contains caffeine, which can reduce blood flow to the brain and central nervous system, causing lightheadedness or vertigo.

Green tea catechins can reduce our bodies' capacity to naturally absorb iron, which can cause anaemia.

Green tea has health benefits when used in moderation. But, if you consume it in excess, it might also give you a headache.

It can also interfere with your sleep if you're one of those persons who consumes green tea in excess.