Male urethral infection is mainly caused by bacteria and other microorganisms upstream infection, a small portion is caused by bloodstream infection or peripheral organ infection. The main causative agent of male urethral infection is bacteria, mycoplasma, chlamydia or other microorganisms, often due to the patient’s own immunity, or stones and other reasons for damage to the mucous membrane, resulting in a weakening of the mucous membrane barrier function, resulting in microbial upstream infection. A small number of patients are due to pathogenic microorganisms traveling with the blood through the urinary tract resulting in bloodstream infection. Prostatitis or seminal vesiculitis and other peripheral organ infections may also lead to urinary tract infection. Male urethritis patients need to go to the hospital to improve urine routine, urine culture, urinary ultrasound and other tests for diagnosis.