STI (Sexually Transmitted Infection)

STI stands for sexually transmitted infection — a group of infections passed mainly through sexual contact, including chlamydia, gonorrhea, syphilis, herpes, HPV (human papillomavirus), and HIV. Many are preventable, and most are treatable or manageable long-term — caught early, dealing with one is often quite routine.

Plenty of STIs have no obvious symptoms early on, so “feeling fine” doesn’t mean uninfected. That’s why regular testing is a normal part of looking after yourself and your partners for anyone who is sexually active, not something you do only once something goes wrong. Condoms substantially cut transmission of most STIs, and some infections (like HPV and hepatitis B) also have vaccines.

Register note: “STI” has largely replaced the older “STD” internationally — infection is more accurate and less moralizing than disease, since many infections can be found and handled before they ever cause illness. In Chinese, the neutral xing chuanbo ganran is likewise displacing the stigma-laden older word for “venereal disease.”

Common misreading: using STIs as “evidence” of promiscuity to shame someone. An infection is a health event, not a verdict on character; moralizing about it just keeps people from testing and seeking help. Testing should rest on informed consent.