Gonorrhoea (sometimes known as ‘the clap’) is one of the most common STIs. It’s caused by a bacteria and can affect anyone who has ever had unprotected anal, oral or vaginal sex. Using condoms, femidoms and dams is the best way to protect yourself. 1 in 10 men and half of women with gonorrhoea experience no signs or symptoms – though you may experience symptoms including yellow or green discharge, a burning feeling when peeing and lower abdominal pain or tenderness Gonorrhoea is a bacterial infection which, in most cases, can be treated with antibiotics Tests usually involve taking a swab of discharge or giving a urine sample, and can be done 2 weeks after unprotected sex If left untreated, gonorrhoea can affect fertility in men and women Check out the NHS Choices website for more information about gonorrhoea. If you would like to know more about STI testing, check our Visiting a Clinic page.