The symptoms of reactive arthritis usually start around 1 to 4 weeks after an infection, such as food poisoning or a sexually transmitted infection (STI).

Common symptoms of reactive arthritis include:

• sore, stiff and swollen joints
• skin around painful joints might feel hot and look red (but redness can be harder to see on black and brown skin)
• feeling very tired

It usually affects knees and feet, but your hands, elbows, spine and tendons around joints might also be affected.

Other symptoms can include:

• mouth ulcers
• pain when peeing
• flaky skin, usually on your soles or palms, which might have yellow pus underneath
• a grey or white patchy rash on your penis
• sticky, watery eyes (conjunctivitis)
• sore, red eyes with sensitivity to light and blurry vision

Ask for an urgent GP appointment or get help from NHS 111 if:

See a GP if:

Reactive arthritis can be difficult to diagnose because several other conditions can have the same symptoms.

You'll usually need a range of tests to find out what's causing your symptoms.

Tests might include:

• a blood test
• tests on a sample of your pee or a swab of your genitals
• tests on a small amount of fluid removed from a painful joint using a needle (needle biopsy)
• an X-ray, MRI or ultrasound scan

You might be referred to a doctor who specialises in joints and inflammation (a rheumatologist) for tests and treatment.

If reactive arthritis is affecting your eyes, you might also be treated by an eye specialist (ophthalmologist). If it's affecting your skin, you might also see a skin specialist (dermatologist).

Treatment for reactive arthritis might include:

• medicines that reduce inflammation, such as NSAIDs (non-steroidal anti-inflammatory drugs) or steroids
• DMARDs (disease-modifying anti-rheumatic drugs) or biological therapies which reduce inflammation by changing the way your immune system works
• physical therapy, such as physiotherapy
• antibiotics, if you still have the infection that may have caused the reactive arthritis

Reactive arthritis usually goes away after 6 months. For some people it can come back, or lead to another type of arthritis which needs long-term treatment, such as osteoarthritis or ankylosing spondylitis.

Find out more

• Versus Arthritis: treatment for reactive arthritis

There are things you can do to ease the symptoms of reactive arthritis.

Reactive arthritis can happen after having an infection that's usually in your stomach (such as food poisoning), or a sexually transmitted infection (STI), such as chlamydia.

Your joints later become swollen because your immune system begins to attack them by mistake.

If the infection that causes reactive arthritis was very mild, you might not remember having it before your joint pain began.