Men once in a while painless blood in the urine can be considered exercise hematuria proteinuria and other physiological conditions, acute nephritis and other urinary tract infections, urinary tract tumors and male prostate hyperplasia and other conditions, it is recommended that further examination. 1. Physiological factors: clinically for the occasional painless hematuria, can be considered to be due to strenuous exercise and other physiological hematuria proteinuria, do not need special treatment. 2. Pathological conditions can be considered in the presence of acute nephritis leading to acute glomerular basement membrane rupture, hemorrhagic cystitis and bleeding caused by urinary tract infections. 3. Transient painless hematuria may also occur in the presence of urological tumors such as renal cancer, renal pelvis tumor, ureteral tumor and bladder tumor. 4. In addition, it cannot be ruled out that men with prostate hyperplasia cause the blood vessels on the surface of the prostate to rupture, causing transient painless hematuria.