Gonorrhea is a sexually transmitted infection caused by the bacterium Neisseria gonorrhoeae. It can be transmitted through any type of sexual contact with an infected person and symptoms may include painful urination and discharge from the genitals. While many infected people do not show symptoms, untreated gonorrhea can lead to serious complications like pelvic inflammatory disease and infertility. Gonorrhea is usually treated with antibiotics like ceftriaxone or azithromycin.