What STI Causes Pus-Like Discharge and Painful Urination?

STIs that can cause pus-like discharge and painful urination include gonorrhea, chlamydia, trichomoniasis, and Mycoplasma genitalium.

STIs (sexually transmitted infections, also called sexually transmitted diseases or STDs) are common illnesses spread from person-to-person through sexual activity such as vaginal, oral, or anal sex. 

Four STIs that can cause pus-like discharge and painful urination include: 

• Gonorrhea
  • May not cause any symptoms
  • When symptoms of gonorrhea occur, in addition to pus-like discharge and painful urination, symptoms may include:
    • Increased vaginal discharge
    • Vaginal bleeding between periods
    • Anal itching or soreness
    • Rectal pain or bleeding
    • Painful bowel movements
    • Painful or swollen testicles (less common)
• Chlamydia
  • May not cause any symptoms
  • When symptoms of chlamydia occur, in addition to pus-like discharge and painful urination, symptoms may include:
    • Rectal pain, discharge, or bleeding from anal infection
    • Pain and swelling in one or both testicles in men (less common)
• Trichomoniasis
  • May not cause any symptoms
  • When symptoms of trichomoniasis occur, in addition to pus-like discharge and painful urination, symptoms may include:
    • Soreness
    • Itching
    • Burning
    • Lower abdominal pain
    • Urinary frequency
    • Painful sexual intercourse 
    • Bleeding after sex
    • Mild itching or burning sensation in the penis after sexual intercourse
    • Vulvar redness
    • Preterm delivery, and delivery of a low-birth-weight infant in pregnant women
• Mycoplasma genitalium
  • May not cause any symptoms
  • When symptoms of Mycoplasma genitalium occur, in addition to pus-like discharge and painful urination, symptoms may include:
    • Pain in the pelvic area 
    • Pain during sex
    • Bleeding after sex
    • Bleeding between periods