Urea usually refers to the urea nitrogen in the renal function test, people with high urea nitrogen can usually drink light tea in moderation, but it is not recommended to drink strong tea. Urea nitrogen is a nitrogenous compound in plasma other than protein, which is excreted through glomerular filtration. It is elevated in renal insufficiency. Therefore, it is used clinically as an indicator of glomerular filtration function. Elevated urea nitrogen is often referred to as azotemia, mostly in renal insufficiency; at the same time, wasting disease, gastrointestinal bleeding, dehydration and other extra-renal factors and high-protein diets can also increase urea nitrogen. Because tea contains more alkaline substances, and is mainly excreted through the kidneys, moderate drinking light tea in general will not aggravate kidney damage, so people with high urea nitrogen can drink light tea in moderation. For patients with high urea nitrogen caused by impaired renal function in moderate to severe renal insufficiency, if they drink strong tea for a long time, it will cause a large amount of oxalic acid and water intake, which may aggravate the burden on the kidneys and lead to further damage to renal function, which is not conducive to the recovery of the condition. Therefore, it is not recommended to drink strong tea when urea nitrogen is high. Patients with high urea nitrogen can eat a moderate amount of fresh vegetables and fruits containing vitamins, trace elements and dietary fiber in their daily diet. If the urea nitrogen is found to be elevated, it is recommended to go to a regular hospital in a timely manner, follow the doctor’s instructions to complete the relevant examinations, to clarify the cause of the disease and then standardized treatment.