You can often come across patients with bleeding urine clinically, some are transient, some are paroxysmal, and some are persistent hematuria, patients are very nervous, let’s first understand what is hematuria? Blood in urine is hematuria, also known as blood in urine. Under normal circumstances, there are no red blood cells in urine. Normal urine contains a very small amount of red blood cells, and uncentrifuged urine can have 0 to 2 red blood cells per high magnification field under the microscope. If the eye can see that the urine is “watery” or blood-colored, or even if there is blood or blood clots in the urine, it is called carnivorous hematuria. It is worth pointing out that red urine is not always hematuria. Some drugs such as rifampin can cause red urine without red blood cells in the urine. More than 95% of hematuria is due to diseases of the urinary tract itself, with prostatic hyperplasia, urinary tract infections, glomerular disease, urinary stones and other diseases being the most common. Genitourinary diseases that may cause blood in the urine (hematuria) can be classified as follows: 1. urinary stones: these include stones in the kidney, ureter, bladder or urethra. 2, genitourinary infections: such as prostatitis, urethritis, pyelonephritis, renal tuberculosis, cystitis, etc. 3, nephritis: which includes acute and chronic nephritis, focal nephritis, benign acute hemorrhagic nephritis, etc. 4, genitourinary tumors: there are kidney tumors, ureteral tumors, bladder tumors, prostate tumors, etc. 5, other urological diseases: such as renal prolapse, wandering kidney, congenital polycystic kidney, etc. 6, urinary tract injury: trauma and damage to the kidney by various chemicals or drugs, etc. Hematuria can also be caused by the following systemic diseases: 1, bleeding disorders: thrombocytopenic violet epilepsy, allergic violet epilepsy, hemophilia, leukemia, pernicious histiocytosis, aplastic anemia, etc. 2, connective tissue diseases: systemic lupus erythematosus, dermatomyositis, polyarteritis nodosa, scleroderma, etc. 3, infectious diseases: leptospirosis, epidemic hemorrhagic fever, filariasis, infectious bacterial endocarditis, scarlet fever, etc. 4, cardiovascular diseases: congestive heart failure, renal embolism, renal vein thrombosis. 5, endocrine metabolic diseases: gouty kidney, diabetic nephropathy, hyperparathyroidism. According to the sequence of hematuria, we can initially determine the site of occurrence of hematuria: 1, when urination starts with hematuria and then becomes normal, it is usually caused by urinary infection and urethral disease; 2, if urination starts normally and ends with hematuria, it is mostly caused by cystitis and prostate disease; 3, if it is “full hematuria” with dark red blood, it is usually caused by kidney or ureteral disease. If a patient has hematuria and related symptoms, he should go to the hospital for relevant examination in time, and treat the symptoms according to the examination results. The patient should rest in bed, minimize strenuous activities, and drink more water. Do not have a fluke mentality, some patients hematuria symptoms disappeared, think that the disease is well, in fact, is the transformation of carnal hematuria into microscopic hematuria, such as urinary tract tumors, should be found as early as possible and timely treatment, delay the best time for treatment, regret too late.