Quick Answer
No, bladder infections (cystitis) are not STIs. They are caused by bacteria entering the urinary tract, often triggered by sexual activity but not transmitted by a partner.
- Not an STI: bacterial infection of the urinary tract.
- Caused by E. coli entering the urethra.
- Sexual activity: common trigger, not cause.
- Treatment: antibiotics.
Context Most Pages Skip
Bladder infections are common but not sexually transmitted.
⚕️ 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.