Mild drinking black tea will not affect the kidney, but if you drink too much tea or drink too much black tea, the daily intake of black tea exceeds 3000ml, it will have an impact on the kidney. Because black tea contains certain theophylline and tea polyphenols, this substance will accelerate the filtration of the glomerulus, and it will prevent the filtration of toxic substances by the renal tubules. Therefore, if you drink black tea in excess, it will cause a certain burden and a certain load on the kidneys. Long-term overdose of black tea will cause chronic glomerular insufficiency or chronic renal insufficiency, the patient will have frequent urination, urinary urgency, increased urination and other symptoms, serious cases will also appear tea-colored urine or the smell of tea in the urine, etc., all belong to the impact of excessive drinking black tea on kidney function.