When the urine contains a certain amount of red blood cells, it is called hematuria. Hematuria can be divided into visual hematuria and microscopic hematuria, only under the microscope to find red blood cells is called “microscopic hematuria”; the naked eye to see blood or a wash of water-like urine, known as “meat and potatoes hematuria”, caused by many causes, need to pay great attention to. The common ones are: 1, the urinary system itself: such as pyelonephritis, cystitis, renal tuberculosis, etc.; immune reactive disorders: such as glomerulonephritis, nephrotic syndrome, etc.; urinary stones, such as ureteral and renal stones, etc.; urinary tumors: such as bladder cancer, kidney cancer, etc.; trauma, renal infarction, renal prolapse, drugs and poisons (such as sulfonamides, gentamicin, kanamycin, carbon tetrachloride poisoning), etc.; 2. Lesions in the adjacent organs of the urinary system: such as prostatitis, vesiculitis, acute tubitis, etc.; uterine or rectal tumors, etc. Most of this hematuria is the result of inflammation spreading to the urinary system and causing increased capillary permeability in the urinary system. 3, systemic diseases: such as sepsis, acute bacterial endocarditis, leptospirosis, epidemic hemorrhagic fever and other infections; hematological diseases, systemic disorders such as leukemia, aplastic anemia, hemophilia, allergic purpura, thrombocytopenia; cardiovascular diseases and hematuria such as congestive heart failure, renal arteriosclerosis, connective tissue diseases such as systemic lupus erythematosus, polyarteritis nodosa, etc. According to clinical observation, carnal hematuria is most common in tumors, tuberculosis and stones of the urinary system. When encountering hematuria, the patient should determine the site of bleeding and clarify the cause of bleeding in conjunction with the clinical situation. When hematuria is accompanied by pain, patients can mostly seek medical attention in time, mostly seen in urinary stones, and when painless carnal hematuria is often ignored by patients, but mostly seen in urinary tumors, so when carnal hematuria occurs for unknown reasons, regardless of whether it is accompanied by pain or not, patients must seek medical attention in time for early diagnosis and treatment. Common diseases of carnal hematuria: 1, kidney tumor: mostly seen in patients over 40 years old, painless throughout hematuria, when the clot passes through the ureter, pain can occur. 2, bladder tumor: it is characterized by painless full course intermittent botryoidal predominantly hematuria, accompanied by infection with bladder irritation symptoms. 3, renal tuberculosis: for terminal hematuria, often accompanied by intractable bladder irritation symptoms, mostly hematuria after urinary frequency and urgency. 4.Urological stones: Mostly after labor, colic and hematuria appear one after another.