Usually drink tea diuretic common reasons are as follows: 1, drinking too much water: drinking too much tea after the effective blood volume will increase, due to the body’s metabolic function is required to reduce the water in the blood, at this time need to discharge a large amount of urine; 2, vasodilatation: tea contains more such as caffeine and other vasodilating substances, are dilating the whole body and the role of the kidney blood vessels, the expansion of blood vessels after the volume of urine or increased, that is, to play a diuretic effect. At the same time, caffeine can also lead to neural excitement, can also expand the glomerulus or kidney blood vessels, causing an increase in renal blood flow, especially when drinking strong tea, such phenomena are more serious and more urine. Therefore, when drinking tea need to try to use light tea, diuretic effect may be relatively weak, otherwise the nervous system, digestive system and kidney function will have a certain impact.