Reiter's Syndrome Is a Type of Inflammatory Arthritis Triggered by Infection

Reiter's syndrome is a form of arthritis that develops after a bacterial infection elsewhere in your body — usually in your digestive tract or urinary system. It is not contagious itself, but it happens because your immune system overreacts to the infection and attacks your joints, eyes, and skin. The condition causes joint pain and swelling, often in your knees, ankles, and feet, along with eye inflammation and urinary symptoms.

The syndrome typically appears two to four weeks after the triggering infection. You may have had diarrhea or a urinary tract infection that seemed to clear up, but then joint pain and other symptoms begin. Not everyone who gets these infections develops Reiter's syndrome — it appears to depend partly on genetics and how your individual immune system responds.

The condition is also called reactive arthritis, which is the term doctors now use more often. Reiter's syndrome is the older name, still used in some contexts. Both names refer to the same disease.

Key Takeaways

  • Reiter's syndrome develops after a bacterial infection in your gut or urinary tract, when your immune system mistakenly attacks your joints.
  • Symptoms include joint pain and swelling (especially in the knees, ankles, and feet), eye redness and pain, and sometimes urinary symptoms or skin rashes.
  • The condition typically starts two to four weeks after the initial infection and can last weeks to months, though some people experience longer-term joint problems.
  • Diagnosis involves blood tests, imaging, and ruling out other forms of arthritis, since there is no single test that confirms Reiter's syndrome.
  • Treatment focuses on managing pain and inflammation with anti-inflammatory medications, physical therapy, and treating any remaining infection.

Which Infections Trigger Reiter's Syndrome

The most common triggering infections are Chlamydia trachomatis (a sexually transmitted infection) and bacterial gastroenteritis from organisms like Shigella, Salmonella, Yersinia, or Campylobacter. You might have gotten gastroenteritis from contaminated food or water. The infection itself may have been mild — some people barely notice the initial symptoms — but weeks later, the joint and eye symptoms appear.

Not every person infected with these bacteria develops Reiter's syndrome. Researchers believe genetic factors, particularly a gene called HLA-B27, make some people more susceptible. Having this gene does not mean you will develop the syndrome, but it increases the risk if you do get one of the triggering infections.

Symptoms You May Experience

The classic triad of Reiter's syndrome involves three main areas: joints, eyes, and the urinary tract. Joint symptoms usually appear first and are often the most noticeable. You may feel pain, swelling, and stiffness in your knees, ankles, feet, or heels. The pain is often worse in the morning or after activity. Some people also develop pain in their lower back or hips.

Eye symptoms include redness, pain, light sensitivity, and discharge — a condition called conjunctivitis or uveitis depending on which part of the eye is inflamed. Your eyes may feel gritty or irritated. Urinary symptoms can include painful urination, increased urge to urinate, or discharge from the urethra.

Other symptoms may include mouth ulcers, skin rashes (especially on the palms and soles of the feet), nail changes, or inflammation where tendons attach to bone. Fever and fatigue are also common. Symptoms vary widely from person to person — some have mild eye involvement while others have severe joint pain.

How Doctors Diagnose Reiter's Syndrome

There is no single blood test or imaging study that confirms Reiter's syndrome. Instead, doctors diagnose it by combining your medical history, physical examination, and test results. They will ask about recent infections, when your symptoms started, and which joints hurt. They will examine your joints, eyes, and skin.

Blood tests may show signs of inflammation (elevated inflammatory markers) and may test for the HLA-B27 gene. X-rays or ultrasound of affected joints can show inflammation or fluid buildup. Your doctor will also rule out other forms of arthritis, such as rheumatoid arthritis or lupus, which can look similar. Urine tests may be done to check for infection or inflammation in the urinary tract.

The diagnosis is based on the pattern of symptoms appearing after a known infection, combined with the findings from these tests. Your doctor may refer you to a rheumatologist (a specialist in joint and autoimmune diseases) if the diagnosis is unclear or if your symptoms are severe.

How Long Reiter's Syndrome Typically Lasts

Most people recover within three to twelve months. Symptoms often peak a few weeks after they start, then gradually improve. Some people feel better within weeks; others take several months. During this time, the inflammation in your joints, eyes, and other tissues slowly decreases.

However, some people experience longer-term problems. A small percentage develop chronic arthritis that persists for years, particularly in the knees, ankles, or feet. Others have recurring episodes of symptoms. The long-term outlook varies — some people have no lasting joint damage, while others develop permanent changes in affected joints.

Treatment Options and Pain Management

Treatment aims to reduce inflammation and manage pain while your immune system settles down. Nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen or naproxen are often the first step. These reduce both pain and swelling in your joints. If NSAIDs alone are not enough, your doctor may prescribe stronger anti-inflammatory medications or corticosteroid injections directly into affected joints.

Physical therapy and gentle exercise help maintain joint mobility and prevent stiffness. Resting the affected joints during flare-ups and using ice packs can also ease pain. If you still have an active infection (such as untreated chlamydia), antibiotics will be prescribed to clear it.

For eye inflammation, your doctor may prescribe eye drops or other topical medications. In severe cases, oral corticosteroids or other immunosuppressive medications may be used, though these are reserved for people with significant symptoms that do not respond to other treatments.

When to See a Doctor

Contact your doctor if you develop joint pain and swelling, especially in multiple joints, particularly after a recent infection or gastrointestinal illness. Also seek care if you have eye pain or redness along with joint symptoms, or if you have painful urination combined with joint pain. These combinations of symptoms warrant medical evaluation.

If you have already been diagnosed with Reiter's syndrome and your symptoms worsen, new symptoms develop, or your pain is not controlled with current treatment, contact your doctor or rheumatologist. Seek when ready care if you have severe eye pain or vision changes, as eye inflammation can sometimes lead to serious complications if left untreated.

Frequently Asked Questions

Can Reiter's syndrome come back after it goes away?

Yes, some people have recurring episodes, though this is not universal. If you are exposed to one of the triggering bacteria again, you may develop symptoms a second time. However, many people who recover from one episode do not experience another.

Is Reiter's syndrome the same as rheumatoid arthritis?

No. Reiter's syndrome is triggered by infection and typically resolves within months, while rheumatoid arthritis is a chronic autoimmune condition that persists long-term. They cause different patterns of joint damage and respond to different treatments, though both involve joint inflammation.

Can I pass Reiter's syndrome to someone else?

No, Reiter's syndrome itself is not contagious. However, the bacteria that trigger it (like chlamydia) can be transmitted. Once someone has the triggering infection, whether they develop Reiter's syndrome depends on their individual immune response and genetics.

Will I have permanent joint damage from Reiter's syndrome?

Most people do not develop permanent damage. However, some people, particularly those with severe or prolonged inflammation, may experience lasting changes in affected joints. Early treatment and managing inflammation can help reduce the risk of long-term joint problems.

What should I do if I think I have Reiter's syndrome?

See your doctor and describe your symptoms, including any recent infections. Mention when your joint pain started and which joints are affected. Your doctor can perform tests and refer you to a rheumatologist if needed. Starting treatment early can help manage symptoms and reduce inflammation.