Gonorrhoea is a bacterial STI caused by the bacterium Neisseria gonorrhoea. Having unprotected sex and sharing sex toys with a person who is infected are ways in which this sexually transmitted infection can be passed on. For many people this STI does not produce any symptoms. However, the most common visible symptoms of gonorrhoea include pain when urinating, an unusual discharge, swelling of the testicles, pain in the lower abdomen, swelling of the testicles in men and unexplained bleeding in women. If left untreated, gonorrhoea can lead to complications such as PID (pelvic inflammatory disease) and infertility. Antibiotic medications can treat this infection effectively.