Chlamydia (kluh-MID-e-uh) trachomatis (truh-KOH-muh-tis) is a common sexually transmitted infection (STI) caused by bacteria.COVID-19:Advice,updatesandvaccineoptionsWeareopenforsafein-personcare.Learnmore:MayoClinicfactsaboutcoronavirusdisease2019(COVID-19)OurCOVID-19patientandvisitorguidelines,plustrustedhealthinformationLateston COVID-19vaccination bysite:ArizonapatientvaccinationupdatesArizona,FloridapatientvaccinationupdatesFlorida,RochesterpatientvaccinationupdatesRochesterandMayoClinicHealthSystempatientvaccinationupdatesMCHSSkiptositenavigationSkiptoContentThiscontentdoesnothaveanEnglishversion.ThiscontentdoesnothaveanArabicversion.SectionsforChlamydiatrachomatisSymptoms&causesDiagnosis&treatmentPrintOverviewChlamydia(kluh-MID-e-uh)trachomatis(truh-KOH-muh-tis)isacommonsexuallytransmittedinfection(STI)causedbybacteria.Youmightnotknowyouhavechlamydiabecausemanypeopledon'thavesignsorsymptoms,suchasgenitalpainanddischargefromthevaginaorpenis.Chlamydiatrachomatisaffectsmostlyyoungwomen,butitcanoccurinbothmenandwomenandinallagegroups.It'snotdifficulttotreat,butifleftuntreateditcanleadtomore-serioushealthproblems.Products&ServicesBook:MayoClinicFamilyHealthBook,5thEditionNewsletter:MayoClinicHealthLetter—DigitalEditionShowmoreproductsfromMayoClinicSymptomsEarly-stageChlamydiatrachomatisinfectionsoftencausefewornosignsandsymptoms.Evenwhensignsandsymptomsoccur,they'reoftenmild,makingthemeasytooverlook.SignsandsymptomsofChlamydiatrachomatisinfectioncaninclude:PainfulurinationVaginaldischargeinwomenDischargefromthepenisinmenPainfulsexualintercourseinwomenBleedingbetweenperiodsandaftersexinwomenTesticularpaininmenChlamydiatrachomatiscanalsoinfecttherectum,eitherwithnosignsorsymptomsorwithrectalpain,dischargeorbleeding.Youalsocangetchlamydialeyeinfections(conjunctivitis)throughcontactwithinfectedbodyfluids.WhentoseeadoctorSeeyourdoctorifyouhaveadischargefromyourvagina,penisorrectum,orifyouhavepainduringurination.Also,seeyourdoctorifyoulearnyoursexualpartnerhaschlamydia.Y