The mumps virus usually causes viral orchitis. Nearly one-third of males who contract the mumps after puberty develop orchitis, usually four to ...COVID-19:Advice,updatesandvaccineoptionsWeareopenforsafein-personcare.Learnmore:MayoClinicfactsaboutcoronavirusdisease2019(COVID-19)OurCOVID-19patientandvisitorguidelines,plustrustedhealthinformationLateston COVID-19vaccination bysite:ArizonapatientvaccinationupdatesArizona,FloridapatientvaccinationupdatesFlorida,RochesterpatientvaccinationupdatesRochesterandMayoClinicHealthSystempatientvaccinationupdatesMCHSSkiptositenavigationSkiptoContentThiscontentdoesnothaveanEnglishversion.ThiscontentdoesnothaveanArabicversion.SectionsforOrchitisSymptoms&causesDiagnosis&treatmentPrintOverviewOrchitis(or-KIE-tis)isaninflammationofoneorbothtesticles.Bacterialorviralinfectionscancauseorchitis,orthecausecanbeunknown.Orchitisismostoftentheresultofabacterialinfection,suchasasexuallytransmittedinfection(STI).Insomecases,themumpsviruscancauseorchitis.Bacterialorchitismightbeassociatedwithepididymitis—aninflammationofthecoiledtube(epididymis)atthebackofthetesticlethatstoresandcarriessperm.Inthatcase,it'scalledepididymo-orchitis.Orchitiscausespainandcanaffectfertility.Medicationcantreatthecausesofbacterialorchitisandcaneasesomesignsandsymptomsofviralorchitis.Butitcantakeseveralweeksforscrotaltendernesstodisappear.Products&ServicesBook:MayoClinicFamilyHealthBook,5thEditionNewsletter:MayoClinicHealthLetter—DigitalEditionShowmoreproductsfromMayoClinicSymptomsOrchitissignsandsymptomsusuallydevelopsuddenlyandcaninclude:SwellinginoneorbothtesticlesPainrangingfrommildtosevereFeverNauseaandvomitingGeneralfeelingofunwellness(malaise)Theterms"testiclepain"and"groinpain"aresometimesusedinterchangeably.Butgroinpainoccursinthefoldofskinbetweenthethighandabdomen—notinthetesticle.Thecausesofgroinpainaredifferentfromthecausesoftesticlepain.WhentoseeadoctorIfyouhavepainorswellinginyourscrotum,especiallyifthepainoccurssuddenly,seeyourdoctorrightaway.Anumberofc