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Orchitis

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Acute prostatitis Acute urinary retention Ectopic pregnancy Epididymitis Orchitis Ovarian torsion Paraphimosis Pelvic inflammatory disease Priapism Pyelonephritis Renal laceration Ruptured ovarian cyst Testicular torsion Tubo-ovarian abscess Urinary tract infection (uncomplicated)Urolithiasis (renal colic)Vaginal bleeding (non-pregnant)

Acute sinusitis Acute tonsillitis Acute upper respiratory infection Animal bite Bacterial meningitis Cellulitis Conjunctivitis (bacterial)Dental abscess Endocarditis Febrile neutropenia Fournier gangrene Hand-foot-mouth disease Hepatitis (acute)Herpes zoster HIV-related illness Human bite Impetigo Infected diabetic foot ulcer Infectious mononucleosis Influenza Necrotizing fasciitis Osteomyelitis Otitis externa Parasitic infection Periorbital cellulitis Peritonsillar abscess Scabies Sepsis Septic arthritis Spontaneous bacterial peritonitis Tick-borne illness (Lyme disease)Tinea infection Tuberculosis Viral exanthem Wound infection

Achilles tendon rupture ACL and mceniscus tear Ankle fracture Ankle sprain Burn Calcaneus fracture Cervical spine fracture Clavicle fracture Dental avulsion Distal radius fracture Drowning Elbow fracture and dislocation Electrical injury Facial bone fracture Facial laceration Femur fracture Fingertip amputation Forearm fracture (radius and ulna)Frostbite Hand:finger laceration Heat exhaustion Heat stroke Hip fracture Humeral shaft fracture Knee dislocation Knee sprain Lightning injury Mandible fracture Metacarpal fracture Metatarsal fracture Muscle strain Nasal fracture Non-accidental trauma Orbital fracture Patella fracture Phalanx fracture (finger)Proximal humerus fracture Pulmonary contusion Rib fracture Rotator cuff tear (acute traumatic)Scalp laceration Scaphoid fracture Shoulder dislocation Skull fracture Splenic laceration Sternal fracture Supracondylar pediatric fracture Tendon laceration (hand:wrist)Thoracic and lumbar spine fracture Tibia:fibula fracture Tibial plateau fracture Toe fracture Traumatic epistaxis Traumatic hyphema

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Orchitis

Clinical Assessment Checklist

Browse categories and answer follow-up questions to refine your symptom profile.

Approach to the Critical Patient

Time-critical threats

Time-critical threats

Testicular torsion until excluded

Pain onset sudden

Symptom duration <6 hours

High-riding testis

Horizontal lie

Absent cremasteric reflex

Nausea or vomiting

If high suspicion, immediate urology consult without delay for imaging

Necrotizing soft tissue infection of perineum

Perineal or scrotal skin necrosis

Crepitus

Severe pain out of proportion

Systemic toxicity

If concern, escalate to resuscitation bay and emergent surgery consult

Sepsis from genitourinary source

Hypotension

Fever with rigors

Altered mental status

Lactate elevation

If shock, initiate sepsis bundle and broad-spectrum antibiotics

Immediate stabilization

Stabilization priorities

Airway and breathing threats

If depressed consciousness, airway positioning and escalation per local protocol

If hypoxemia, oxygen to target SpO2 per local protocol

Circulation threats

If hypotension, IV access and isotonic crystalloid bolus

If persistent hypotension, vasopressor per sepsis protocol

Analgesia early

NSAID unless contraindicated

Opioid for uncontrolled pain

Isolation considerations

If parotitis with suspected mumps, droplet precautions per local policy

Key decision points

Key decisions

Orchitis versus epididymo-orchitis

Epididymal tenderness often present in bacterial etiologies

Isolated orchitis more consistent with viral cause including mumps

STI-associated versus enteric-associated bacterial infection

Age <35 or STI risk

Insertive anal sex risk for enteric pathogens

Recent urinary instrumentation

Known urinary tract obstruction

Complicated infection

Abscess concern

Testicular infarction concern

Immunocompromised host

Inability to tolerate oral therapy

History

Symptom profile

Symptom profile

Pain characteristics

Onset sudden versus gradual

Duration and progression

Radiation to groin or flank

Swelling pattern

Unilateral versus bilateral

Rapid enlargement

Associated urinary symptoms

Dysuria

Frequency

Urgency

Hematuria

Systemic symptoms

Fever

Rigors

Myalgias

Malaise

Exposure and risk

Exposure and risk

Sexual history

New partner

Condom use

Urethral discharge

Insertive anal sex

Infection exposures

Recent viral prodrome

Parotitis exposure

MMR vaccination status

Genitourinary risk

Recent catheterization

Recent cystoscopy

BPH symptoms

Known urethral stricture

Recurrent UTI history

Trauma and exertion

Direct scrotal trauma

Recent heavy lifting

Pitfalls

Pitfalls

Torsion mimics

Pain improvement after analgesia not reassuring

Urinary symptoms do not exclude torsion

Missed alternative diagnoses

Incarcerated inguinal hernia symptoms

Testicular tumor symptoms

Renal colic referred pain

Physical Exam

Focused exam

Focused exam

Vitals

Fever

Tachycardia

Hypotension

Abdominal and groin

Inguinal hernia

Costovertebral angle tenderness

Scrotum and testes

Testicular tenderness localization

Epididymal tenderness

Testicular lie

Cremasteric reflex

Scrotal erythema

Scrotal edema

Fluctuance

Genital exam

Urethral discharge

Penile lesions

Meatal inflammation

Findings and interpretation

Findings and interpretation

Findings supporting torsion

High-riding testis

Horizontal lie

Absent cremasteric reflex

Findings supporting bacterial epididymo-orchitis

Epididymal tenderness and swelling

Relief with scrotal elevation possible

Findings supporting complicated infection

Skin necrosis

Crepitus

Rapidly progressive edema

Toxic appearance

Differential Diagnosis

Acute scrotum differential

Acute scrotum differential

Life-threatening and time-critical

Testicular torsion

ICD-10 N44

SNOMED CT testicular torsion concept

Fournier gangrene

ICD-10 N49.3

Infectious and inflammatory

Orchitis

ICD-10 N45

SNOMED CT orchitis concept

Epididymitis

ICD-10 N45.1

Epididymo-orchitis

ICD-10 N45.3

Testicular abscess

ICD-10 N45 with abscess complication coding per local standards

Structural and vascular

Incarcerated inguinal hernia

Trauma with hematoma

Segmental testicular infarction

Varicocele thrombosis

Neoplastic

Testicular tumor

ICD-10 C62

Differentiating clues

Differentiating clues

Torsion

Sudden onset severe pain

Absent cremasteric reflex

Viral orchitis including mumps

Parotitis or viral prodrome

Bilateral involvement possible

Enteric bacterial infection

Age >35

Lower urinary tract symptoms

Recent instrumentation

STI-associated infection

Urethral discharge

New sexual partner

Laboratory Tests

Core tests

Core tests

Urinalysis

Pyuria supportive of bacterial source

Hematuria possible

Urine culture

Enteric pathogen confirmation

Antibiotic susceptibility guidance

NAAT for gonorrhea and chlamydia

First-catch urine or urethral specimen per local protocol

Extragenital testing if exposure

CBC

Leukocytosis supportive but nonspecific

CRP

Inflammatory activity trend support

Sepsis and complication labs

Sepsis and complication labs

Lactate

Sepsis risk stratification

Blood cultures

Fever with systemic toxicity

Suspected bacteremia

Creatinine and electrolytes

Renal function for antibiotic selection

Dehydration assessment

Pitfalls and limitations

Pitfalls and limitations

Urinalysis limitations

Normal urinalysis does not exclude epididymo-orchitis

NAAT timing

Early infection possible false negative

Leukocytosis limitations

Poor specificity for scrotal pathology

Diagnostic Tests

Scoring Systems

Scoring systems

TWIST score for torsion risk stratification

Testicular swelling 2 points

Hard testis 2 points

High-riding testis 1 point

Absent cremasteric reflex 1 point

Nausea or vomiting 1 point

TWIST interpretation cautions

Not sufficient to rule out torsion in isolation

High-risk features trigger immediate urology involvement

MRI

MRI

Rare indications

Indeterminate ultrasound with persistent concern for tumor

Complex soft tissue infection mapping when CT contraindicated

Limitations

Time delay incompatible with torsion concern

Limited ED availability

CT

CT

Indications

Suspected Fournier gangrene extent

Suspected intra-abdominal source with referred pain

Complicated infection with concern for deep abscess extension

Limitations

Poor primary test for testicular perfusion

Radiation exposure

Ultrasound

Ultrasound

Color Doppler scrotal ultrasound

Primary imaging for acute scrotum when torsion not clinically certain

Perfusion assessment

Typical bacterial epididymo-orchitis findings

Increased blood flow hyperemia

Epididymal enlargement

Reactive hydrocele possible

Torsion findings

Decreased or absent testicular blood flow

Whirlpool sign of spermatic cord possible

Complication findings

Abscess collection

Testicular infarction areas

Pyocele

Disposition

Level of care

Level of care

Discharge criteria

Torsion excluded

Hemodynamic stability

Oral intake tolerated

Pain controlled with oral regimen

Reliable follow-up within 48 to 72 hours if not improving

Admission criteria

Sepsis physiology

Severe uncontrolled pain

Immunocompromised host

Unable to tolerate oral antibiotics

Abscess or infarction concern

Transfer criteria

No onsite urology with torsion concern

Fournier gangrene concern

Follow-up planning

Follow-up planning

Urology follow-up

Persistent swelling beyond 2 to 4 weeks

Suspicion for tumor after infection resolution

Sexual health follow-up

Partner notification and testing if STI confirmed

Retesting per local public health guidance

Treatment

Supportive care

Supportive care

Scrotal support

Elevation

Athletic supporter

Cold therapy

Ice packs intermittently

Activity modification

Bed rest for severe symptoms

Avoid heavy lifting during acute phase

Analgesia and anti-inflammatory

Analgesia and anti-inflammatory

NSAIDs

Ibuprofen PO

400 mg every 6 hours

Maximum 2400 mg per day

Naproxen PO

500 mg then 250 mg every 6 to 8 hours

Maximum 1250 mg per day

Acetaminophen

650 mg every 6 hours

Maximum 3000 mg per day

Opioid for breakthrough pain

Morphine PO

5 mg to 10 mg every 4 hours as needed

Avoid if respiratory depression risk

Antibiotics

Antibiotics

Suspected STI-associated orchitis or epididymo-orchitis

Ceftriaxone IM single dose

500 mg once

If weight >=150 kg, 1 g once

Doxycycline PO course

100 mg twice daily for 10 days

Evidence basis

CDC STI Treatment Guidelines epididymitis regimen

Suspected STI plus enteric pathogens risk

Ceftriaxone IM single dose

500 mg once

If weight >=150 kg, 1 g once

Levofloxacin PO course

500 mg once daily for 10 days

Evidence basis

CDC STI Treatment Guidelines epididymitis regimen

IUSTI European guideline supports dual coverage when both STI and enteric risk

Suspected enteric pathogens without STI risk

Levofloxacin PO course

500 mg once daily for 10 days

Ofloxacin PO course

300 mg twice daily for 10 days

Culture-directed alternatives

Trimethoprim-sulfamethoxazole DS PO

1 tablet twice daily for 10 to 14 days

Use only if organism susceptible

Stewardship notes

Avoid ciprofloxacin due to reduced recommendation in European guidance

Severe infection or sepsis physiology

If unstable, initiate broad-spectrum IV antibiotics per local urosepsis pathway

Piperacillin-tazobactam IV

4.5 g every 6 to 8 hours

Ceftriaxone IV

2 g daily

Add vancomycin IV if MRSA risk or necrotizing infection concern

Weight-based dosing per local protocol

Viral orchitis including mumps

Viral orchitis including mumps

Supportive management

Bed rest

Scrotal support

Analgesic and anti-inflammatory therapy

Corticosteroids

Short-term pain reduction possible

No proven prevention of testicular atrophy or altered clinical course

Antivirals

No specific antiviral therapy for mumps orchitis

Procedural and consultation triggers

Procedural and consultation triggers

Urology consult indications

Torsion not excluded

Abscess on ultrasound

Testicular infarction concern

Failure to improve within 48 to 72 hours on appropriate therapy

Surgical emergency indications

Fournier gangrene concern

Incarcerated hernia concern

Special Populations

Pregnancy

Pregnancy

Antibiotic selection constraints

Avoid doxycycline

Avoid fluoroquinolones when alternatives available

Gonorrhea coverage

Ceftriaxone IM single dose

500 mg once

If weight >=150 kg, 1 g once

Chlamydia coverage alternatives

Azithromycin PO single dose

1 g once

Amoxicillin PO course

500 mg three times daily for 7 days

Consultation considerations

Obstetrics input for systemic illness or diagnostic uncertainty

Geriatric

Geriatric

Higher enteric pathogen likelihood

BPH and urinary retention risk

Instrumentation exposure risk

Lower threshold for admission

Frailty

Renal impairment affecting antibiotic choice

Medication safety

NSAID renal risk

Fluoroquinolone adverse effect risk

Pediatrics

Pediatrics

Etiology differences

Viral causes common

Bacterial causes associated with urinary tract anomalies

Torsion risk

Lower threshold for emergent urology involvement

Imaging should not delay surgical management when high suspicion

Evaluation for urinary anomalies when bacterial infection confirmed

Urine culture follow-up

Outpatient urology or nephrology evaluation per local pathways

Antibiotics

Culture-directed therapy preferred

Weight-based dosing per pediatric formulary

Background

Epidemiology

Epidemiology

Orchitis overview

Isolated orchitis uncommon

Orchitis often occurs with epididymitis as epididymo-orchitis

Mumps orchitis

Occurs mainly in postpubertal males with mumps infection

Symptoms often resolve within 4 to 10 days with supportive care

Pathophysiology

Pathophysiology

Ascending infection pathway

Urethra to epididymis

Extension to testis causing orchitis

Viral orchitis pathway

Hematogenous spread

Testicular inflammation and edema

Complication mechanisms

Increased intratesticular pressure

Ischemia risk in severe inflammation

Abscess formation in bacterial infection

Therapeutic Considerations

Therapeutic considerations

Time dependency

Torsion salvage decreases with time

Do not delay urology involvement when suspicion high

Antibiotic targeting principles

STI risk requires gonorrhea and chlamydia coverage

Enteric risk requires gram-negative coverage

Mumps orchitis management

Supportive care mainstay

Steroids do not prevent atrophy or change course in available evidence

Guideline alignment notes

CDC regimens support ceftriaxone plus doxycycline or levofloxacin based on risk profile

European guidance discourages ciprofloxacin for epididymo-orchitis

Patient Discharge Instructions

copy discharge instructions

copy discharge instructions

Diagnosis summary

Testicular inflammation consistent with orchitis or epididymo-orchitis

Home care

Scrotal support and elevation

Ice packs 10 to 15 minutes at a time as needed

Rest and avoid heavy lifting until improving

Medications

Take antibiotics exactly as prescribed until finished

Use acetaminophen or NSAID as directed for pain

Sexual health

No sex until symptoms resolved and treatment completed

Partner testing and treatment if STI suspected or confirmed

Return to ED now

Sudden severe worsening pain

New nausea or vomiting with worsening pain

Fever with shaking chills

Fainting or severe weakness

Rapidly spreading redness or skin discoloration

New swelling that rapidly increases

Follow-up

Reassessment in 48 to 72 hours if not clearly improving

Urology follow-up if swelling persists beyond 2 to 4 weeks

References

Guidelines and key sources

Guidelines and key sources

CDC Sexually Transmitted Infections Treatment Guidelines

Epididymitis recommended regimens include ceftriaxone 500 mg IM once plus doxycycline 100 mg PO twice daily for 10 days

Epididymitis with STI plus enteric risk includes ceftriaxone 500 mg IM once plus levofloxacin 500 mg PO daily for 10 days

IUSTI European guideline on epididymo-orchitis

Dual coverage recommended when both STI and enteric pathogen risk

Ciprofloxacin no longer advised with preference for levofloxacin or ofloxacin

Mumps orchitis reviews

Supportive care includes bed rest, scrotal support, and analgesic and anti-inflammatory drugs

Steroids may reduce pain and swelling but do not prevent atrophy or alter course

TWIST score sources

Criteria include swelling, hard testis, high-riding testis, absent cremasteric reflex, nausea or vomiting

Use as risk stratification only, not as standalone rule-out

Generator specification source

Medical Disclaimer

SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.

Last Reviewed: February 24, 2026 by SymptomDX Medical Team

SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.

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