The urethral opening is red, swollen, painful, and there is pus discharge, if there is no breakage of the skin surface, the most likely disease is gonorrhea, also known as gonorrheal urethritis. This is a sexually transmitted disease, mostly because of unclean sex infection caused by this disease can not be self-healing, the need to apply antibiotics, you can take azithromycin orally for a week, drink more water, basically can be cured. It is also possible that non-gonococcal urethritis, also need anti-inflammatory treatment, during the treatment period prohibit couples from living, so as not to cause cross-infection. The patient can go to the local regular hospital urology department, do urethral secretion examination, after diagnosis under the guidance of the doctor treatment. Usually drink more water, eat more fresh fruits and vegetables, exercise, and develop good habits.