Gonorrhea (also gonorrhoea) is a common sexually transmitted infection caused by the bacterium Neisseria gonorrhoeae (also called Gonococcus, which is often abbreviated as "GC" by clinicians). In the US, its incidence is second only to chlamydia (Chlamydia infection) among bacterial STDs. In both men and women if gonorrhea is left untreated, it may spread throughout the body, affecting joints and even heart valves.

Gonorrhea cannot be spread by sharing toilets and bathrooms.