[Classical sexually transmitted diseases in the anorectal region]

Sexually transmitted infections (STIs) in the anorectal region are disproportionally detected in risk populations such as men who have sex with men (MSM). However, due to changes in sexual behaviour they are increasingly diagnosed in heterosexual individuals. Due to the recent implementation of oral HIV pre-exposure prophylaxis together with lack of condom use, a further rise in STIs is expected.

This review addresses epidemiology, clinical picture, diagnostic pitfalls and current therapy guidelines of "classical" bacterial STIs involving the anorectum.

STI manifestations in the anal region are frequently nonspecific or asymptomatic so that the diagnosis may be missed. In an endoscopic examination of the rectum, they can even mimic inflammatory bowel disease or malignancy. Therefore, knowledge of possible symptoms of bacterial STIs in this area is helpful for early diagnosis. Coinfections with other STIs are common and should prompt a search of other pathogens including HIV and hepatitis B/C.