Hematuria is not uncommon in daily outpatient clinics, and often patients ask: Doctor, what should I do if another doctor says I have hematuria? No rush, let’s first look at what hematuria is. Hematuria refers to the microscopic examination of urine sediment after centrifugation with more than 3 red cells per high-powered field of view as microscopic hematuria (i.e., often found in routine urinalysis). If 1L of urine contains 1ml of blood that is carnal hematuria (such as meat wash water-like). After finding and clarifying hematuria by routine urinalysis, our next step is to confirm that the blood does originate from the urine (urinary system), especially for women to rule out vaginal bleeding caused by gynecological diseases. In the next step, we have to clarify the source of the blood and urine. Glomerular diseases (such as nephritis), urinary stones, urinary tract infections, hematologic diseases, trauma, tumors, etc. can cause hematuria, so we need to check the urine red blood cell morphology to distinguish whether the source of hematuria is of glomerular origin (nephritis) or non-glomerular origin (others such as stones, infections, etc.). Finally, we do the relevant tests according to the previous step to clarify the cause of hematuria. Hematuria is not uncommon and gradually, hematuria is not difficult to deal with.