Gonorrhea is a sexually transmitted bacterial infection caused by Neisseria gonorrhoeae that commonly infects the urethra, cervix, and rectum. Common symptoms in men include discharge from the penis and painful urination, while women often experience abnormal vaginal discharge and lower abdominal pain. The bacteria are transmitted through unprotected vaginal, oral, or anal sex. Without treatment, gonorrhea can cause serious complications like pelvic inflammatory disease and infertility. It is usually treated effectively with antibiotics prescribed by a doctor.