Urethral flow of transparent liquid may be a normal physiological phenomenon, but also may be the manifestation of certain diseases, such as non-gonococcal urethritis, chronic prostatitis, etc., should be timely consultation to find out the cause. 1. Normal physiological phenomenon: recently the patient has a sexual urge, or the phenomenon of penile erection, the urethra secretion of transparent urethral bulb fluid, prostate fluid, is a normal physiological phenomenon, there is no abnormality, do not need special treatment. 2. non-gonococcal urethritis: a history of unclean sex, in addition to gonococcus other pathogens caused by infection, manifested in frequent urination, urinary urgency, urinary pain, urethral secretion increased, urethral opening red and swollen, urethral secretion is liquid. 3. Chronic prostatitis: common in adult males, with symptoms such as frequent urination, urgency, inability to urinate, dysuria, clear fluid flow from the urethra, and perineal discomfort. Urethral flow of transparent liquid there are other factors may, should be timely to the hospital outpatient consultation, do not self-medication, so as not to delay the condition.