Today we use tea regularly as part of our diet. Some 50000 years ago tea was first used in China as medicine. There are some side effects of tea i.e. use of caffeine in tea is harmful for the Central Nervous System and cause many diseases. Excessive use of tea is harmful for the kidneys and stomach. Presence of Tannin in tea also causes many problems of stomach. In conclusion we can say that although tea is good hot drink but its excessive use is detrimental for health.