The disease is caused by the bacterium called Neisseria gonorrhoeae. It is commonly spread by having sex with an infected partner. The common symptoms of gonorrhoea are burning sensation while peeing, thick copious purulent milk-like or yellow-green pus discharge from the urethra. Gonorrhoea may also infect the anal canal or oropharynx during anal and oral sex, and may present as mucopurulent anal discharge or sore throat respectively. If gonorrhoea is not adequately treated, it can spread and damage other organs. Patients may develop an infection in the testicles, and if it is left untreated it can cause joint, skin and eye problems.