Blood in urine in men is a common symptom in itself and this symptom may be caused by a variety of factors, in the vast majority of cases presumably related to the pathology of the urinary system itself.
If a male patient has blood in the urine, the bleeding is small and occurs at the beginning of urination, the symptom is presumed to be caused by a urethral lesion.
If the blood is present throughout and the symptoms are more severe, it is presumed that there is a possibility of nephritis.