Does tea have caffeine？

Tea contains caffeine, also known as caffeine. The main effect on the human body is that it can excite the central nervous system, with cardiotonic and diuretic effects, so after drinking tea in daily life, it will make people's spirits uplifted, and have energy to do things, and it can be very good for the benefit of urination and the treatment of edema. For patients with heart failure, a small amount of tea can promote the beating ability of the heart.

In addition for patients with insomnia, can you drink tea before going to bed, because it contains caffeine, will make the brain nerve excitation and lead to insomnia, in the clinical must pay attention to. Tea in addition to caffeine, but also contains tea polyphenols, and 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 own physical condition, the reasonable application of tea to health care.