Tea contains caffeine, also known as caffeine. The main effect on the human body is that it can excite the central nervous system, has a strong heart, diuretic effect, so after drinking tea in daily life, it will make people’s spirits lifted, do things with energy, and can be very good for urination and treatment of edema. For patients with heart failure, a small amount of tea can promote the heart’s pounding ability. In addition, for patients with insomnia, can you drink tea before going to bed, because it contains caffeine, will make the brain nerve excitement and lead to insomnia, in the clinical must pay attention to. In addition to caffeine, tea also contains tea polyphenols, there are polysaccharides and other related nutrients, the human body have a certain health care treatment effect, need to be under the guidance of a doctor, according to their physical condition, the reasonable application of tea to health care.