Quick Answer
Vulvovaginal candidiasis (yeast infection) is caused by overgrowth of Candida fungus, not a sexually transmitted organism. It is treatable with OTC and prescription antifungals. Sexual activity can trigger it but does not cause it.
- Not an STI: fungal overgrowth, not infection
- Treatment: OTC antifungals or fluconazole
- Triggered by: antibiotics, pregnancy, diabetes, hormones
- Partners do not need treatment
Context Most Pages Skip
Yeast infections are so common that they are often the first thing people think of when they notice genital symptoms — but they are not STIs.
Key Facts
Yeast infections are caused by overgrowth of Candida albicans, which is normally present in the vagina. Antibiotics, hormonal changes, and diabetes are common triggers. OTC treatments work but recurrent infections need prescription therapy.
⚕️ This page is educational and does not replace advice from a licensed clinician. If you may have been exposed to an STI, get tested — most infections are manageable, and many are fully curable.
Sources & Further Reading
- CDC — Sexually Transmitted Infections
- CDC STI Treatment Guidelines
- WHO — Sexually transmitted infections fact sheet
- MedlinePlus — Sexually Transmitted Diseases
Figures reflect CDC surveillance and WHO estimates; they are population statistics, not personal risk predictions.