Reactive arthritis symptoms
Reactive arthritis is joint inflammation triggered by an infection elsewhere in the body — usually a gut or urinary infection. Symptoms typically appear 2–4 weeks after the triggering infection.
Common symptoms of reactive arthritis
- Joint pain and swelling, often in the knees, ankles, or feet
- Lower back or buttock pain
- Heel pain (enthesitis)
- Dactylitis — sausage-like swelling of a toe or finger
- Eye inflammation (conjunctivitis or uveitis)
- Burning on passing urine, even after the triggering infection has cleared
When to see your GP
See your GP if you develop joint pain and swelling within a few weeks of a gut or urinary infection. Mention the recent infection — it's an important clue for diagnosis.
This is general information, not a substitute for personalised medical advice.
Frequently asked questions
What are the first signs of reactive arthritis?
The earliest signs of reactive arthritis often include joint pain, stiffness — particularly in the morning or after rest — and reduced flexibility in the affected area. Symptoms typically develop gradually, so keep a short symptom diary and speak to your GP if pain persists for more than a few weeks.
How is reactive arthritis diagnosed in the UK?
In the UK, GPs diagnose reactive arthritis from your symptoms, a clinical examination, and — where appropriate — blood tests, X-rays, ultrasound or MRI. For inflammatory types, your GP may refer you to UK healthcare rheumatology for specialist review under NICE guidance.
Can rea symptoms come and go?
Yes. Many people with rea experience flares — periods of worse pain, swelling and stiffness — followed by quieter spells. Tracking your flares helps you and your GP spot triggers and adjust treatment.
When should I see a GP about reactive arthritis symptoms?
Book a GP appointment if joint pain has lasted more than a few weeks, is interfering with sleep or daily life, or is accompanied by swelling, warmth, locking or unexplained fatigue. Early assessment leads to better long-term outcomes.
Is reactive arthritis the same as general arthritis pain?
No — there are over 100 forms of arthritis, and reactive arthritis has its own pattern of symptoms, affected joints and treatment pathway. Getting the right diagnosis matters because the most effective treatments differ between conditions.