STI stand for Sexually Transmitted Infection and they can be pretty hard to talk about sometimes. But actually, they're pretty common and nothing to be ashamed of. Most STIs are symptomless, so the only way to know for sure if you have one or not is to get tested. But fear not - getting tested is quick, easy and free. Find all the information you need below on different kinds of STIs, what it's like to get tested, and where your nearest STI clinic is.