It can also lead to major mental health disorders if not treated. In men it can affect the testicles. Treatment involves a course of antibiotics which can cure the disease. Even if there are no symptoms, or if the symptoms clear up, the disease is quite likely to still be there. If you have had unprotected sex you should have a test for STD's.
Condoms are the best way of reducing the risk of catching gonorrhoea.
Finally, gonorrhoea may cause infections of the mouth and anus. An oral infection normally produces no symptoms. In some cases the patient will experience a sore throat. Like the oral infection, the anal infection often causes no observable symptoms. If untreated complications may occur.