Male urinary tract infection pus is mainly due to the inflammatory response, the urethra is infected by disease-causing microorganisms such as bacteria, mycoplasma, chlamydia after the infection leads to the urethral mucosa congestion, edema, ulceration and lead to discharge. 1. Bacterial infection: Bacterial infection is the most common cause, such as E. coli, staphylococcus, gonococcus and so on. Among them, gonococcal infection is more common, also known as gonorrhea, which is a sexually transmitted disease, mostly transmitted due to unclean sexual contact. The pus is usually yellow or milky white. 2. Mycoplasma and Chlamydia infections: Mycoplasma and Chlamydia infections of the urethra belong to non-gonococcal urethritis, mostly accompanied by urethral itching, tingling, and urethral pus is yellowish, sticky liquid. Overall, urethral pus need to go to the hospital in time to do the examination, under the guidance of the doctor treatment.