How does urethral discharge occur?

Urethral purulent causes: 1, sexually transmitted diseases, the most common disease is gonorrhea, is caused by unclean sexual contact caused by gonococcal infection urethra, can show a large number of purulent secretions from the urethra, yellow color, accompanied by urethral itching, tingling or frequent urination, urgency and other performance; 2. Non-gonococcal urethritis is caused by unclean sexual contact, infection with mycoplasma and chlamydia, which will show yellow or white thin pus flowing out of urethra, accompanied by itching in urethra, burning in urethra or accompanied by frequent urination, urgency of urination, pain of urination, etc. It also belongs to sexually transmitted diseases and is caused by infection caused by unclean sexual contact; 3. The existence of diverticulum or tumor in urethra can also cause urethral pus. The existence of diverticulum in urethra indicates that there is defect in urethra, urine is easy to remain in diverticulum and cause infection, which will show urethral pus.