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Reactive Arthritis

Post-infectious spondyloarthritis following urogenital or gastrointestinal infection

Written by: Saygı Hospital Health Guide Editorial Board
Published:

This content is for general information; please consult your physician for diagnosis and treatment.

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Ortopedi ve Travmatoloji department. Book Appointment →

What is Reactive Arthritis?

ReA is an aseptic postinfectious spondyloarthritis in which molecular mimicry between microbial antigens and host proteins and persistent microbial components (antigens, DNA) in joints trigger innate immune activation and CD8+ T-cell responses; HLA-B27 association is strong.

Classic triggers — genitourinary: Chlamydia trachomatis; enteric: Salmonella enterica, Shigella flexneri, Yersinia enterocolitica, Campylobacter jejuni, Clostridioides difficile; also SARS-CoV-2 in recent reports.

The classic triad of Reiter syndrome (urethritis, conjunctivitis, arthritis) is now a historical concept; most cases present as asymmetric lower extremity oligoarthritis with enthesitis and dactylitis 1–4 weeks after infection, and 30–50% resolve in 6 months.

Chronic ReA (>6 months) occurs in 15–30%, may evolve to spondyloarthritis with axial involvement; risk factors include HLA-B27 positivity, severity of initial infection, and persistent chlamydial infection.

Symptoms

Asymmetric oligoarthritis of lower extremity large joints (knees, ankles) with effusion and warmth
Enthesitis — Achilles tendon, plantar fascia; heel pain common at presentation
Dactylitis — sausage toes or fingers
Ocular — bilateral conjunctivitis (early) and acute anterior uveitis (later, HLA-B27 association)
Mucocutaneous — keratoderma blennorrhagicum (hyperkeratotic palmoplantar lesions), circinate balanitis, oral ulcers
Constitutional — fever, fatigue, weight loss, and urethritis or cervicitis from original infection

Risk Factors

Recent genitourinary or gastrointestinal infection (1–4 weeks prior)
HLA-B27 positivity (strongest genetic predictor of severity and chronicity)
Male sex (more common in chlamydia-associated ReA)
Age 20–40 years (peak incidence)
Unprotected sexual activity with multiple partners (Chlamydia)
Foodborne infection outbreaks and travel to endemic areas

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • New-onset oligoarthritis 1–4 weeks after diarrhea, dysuria, or urethral discharge should prompt rheumatology evaluation with infection workup (stool culture, urine/cervical PCR for Chlamydia) and HLA-B27.
  • Patients with ReA and severe eye pain, photophobia, or visual change require same-day ophthalmology evaluation for anterior uveitis.
  • Persistent or worsening arthritis beyond 6 months requires treatment escalation, reassessment for evolution to chronic spondyloarthritis, and exclusion of alternative diagnoses.

Treatment Methods

01
First-line — NSAIDs (naproxen, indomethacin, celecoxib) for analgesia and anti-inflammatory effect; intra-articular corticosteroid injection for persistent monoarticular involvement.
02
Treatment of triggering infection — doxycycline or azithromycin for Chlamydia trachomatis (with partner treatment); enteric infections typically self-limited; antibiotic therapy has limited impact on established ReA but reduces chronicity in chlamydia cases.
03
Chronic or severe disease — DMARDs (sulfasalazine, methotrexate, leflunomide) for persistent arthritis; evaluate TNF-α inhibitors (etanercept, adalimumab, infliximab) or IL-17 inhibitors for refractory spondyloarthritis features.
04
Physical therapy and exercise to maintain joint mobility and function; supportive measures for enthesitis (orthotics, cold therapy, stretching).
05
Ophthalmology co-management for conjunctivitis/uveitis; urology/gynecology for urethritis/cervicitis; public health reporting and partner notification for Chlamydia.
06
Patient education on prevention — safe sexual practices, food hygiene during travel; vaccinations per EULAR; regular follow-up for chronicity assessment.

Which Department to Visit?

You can visit our Ortopedi ve Travmatoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.