Q: My father, who is 74 years old, has had submicroscopic hematuria on routine urine tests for the past few years, but there is no discomfort when he urinates. Later, he was examined in a tertiary care hospital and diagnosed with glomerulonephritis, but the microscopic hematuria still exists most of the time after treatment. The doctor said that a little hematuria is not a big problem and should not be taken seriously, is that so? Wang Bin: Hematuria is the presence of blood in the urine, which is a common symptom of urinary system lesions and has many causes, such as inflammation of the urinary system, stones, tumors and so on. For painless hematuria in the elderly, tumors must be excluded. Under normal circumstances, there are no red blood cells or occasionally 2-3 red blood cells in urine. If 1 liter of urine contains 1 ml of blood, blood in the urine can be seen with the naked eye (carnal hematuria). After centrifugation and microscopic examination of the urine sediment, the number of red blood cells per high magnification field is greater than 3, which is called microscopic hematuria. As the condition improves, hematuria can usually be reduced or disappear. The aim of treatment for patients with nephritis is mainly to prevent or delay the progressive deterioration of renal function, without the goal of eliminating red blood cells in the urine. If the doctor tells you that there is no major problem when other diseases are ruled out, then both the patient and the family need not have too much psychological burden. Also pay attention to standardized treatment, follow medical advice, check and follow up every 6 months or so. Just drink more water and pay attention to the balance of yin and yang and rest in your life.