The common causes of urethral inflammation are urethral foreign body, urinary tract obstruction, urethral injury, inflammation of neighboring organs, and unclean sex. 1. Urethral foreign body: foreign body from outside into the foreign body or urethra stones, etc., stop for a little while can lead to urethral infection. 2. Urethral obstruction: such as circumcision stenosis, urethral stenosis, urethral stenosis, posterior urethral valve, urethral tumor, female hymen umbrella, urethral hymen fusion, etc., due to urinary incontinence, urine accumulation in the urethra can be secondary to urethral infection. 3. Urethral injury: urethral mucosal abrasion caused by urethral instrumentation, can destroy the urethral mucosal defense function, resulting in bacterial infection. 4. Inflammation of neighboring organs: such as prostatitis, seminal vesiculitis, vaginitis or cervicitis can spread to the urethra, which is often the stubborn foci of chronic urethritis. 5. unclean sex: urinary tract infections are often associated with unclean sex, unclean sex easily cause urinary tract infections. Urethritis can be manifested as urethral itching, burning sensation and urinary frequency, urinary urgency, urinary pain and other manifestations, if gonococcal urethritis, pus or purulent discharge can be seen. Urethritis may also be caused by other factors, it is recommended that patients seek medical attention in a timely manner, in accordance with the doctor’s instructions for treatment, the treatment period prohibits sexual intercourse, usually need to pay attention to sexual hygiene.