Reiter's Syndrome Is a Type of Inflammatory Arthritis That Follows an Infection

Reiter's syndrome is a form of arthritis that develops after your body has fought off a bacterial infection — usually in your digestive tract or urinary system. The condition causes joint pain and swelling, typically in your knees, ankles, and feet, but can also affect your eyes, skin, and urinary tract. It is not contagious, and you cannot catch it from another person.

The syndrome was named after Hans Reiter, a German physician who first described it in 1916. Today, medical professionals often call it reactive arthritis because the inflammation is your immune system's reaction to an infection that has already passed. The infection itself may have caused only mild symptoms or gone unnoticed, but weeks later your joints begin to hurt and swell.

Reiter's syndrome is relatively uncommon. It occurs more often in men than in women, and typically appears in people between ages 20 and 40, though it can develop at any age. The condition usually lasts a few months to a year, though some people experience symptoms that come and go over a longer period.

Key Takeaways

  • Reiter's syndrome develops weeks after a bacterial infection in your gut or urinary tract, not during the infection itself.
  • The main symptoms are joint pain and swelling in your knees, ankles, and feet, often accompanied by eye irritation or skin rashes.
  • A genetic marker called HLA-B27 is present in most people who develop Reiter's syndrome, though having the marker does not mean you will develop the condition.
  • Diagnosis requires a doctor to connect your joint symptoms to a recent infection and rule out other forms of arthritis.
  • Treatment focuses on managing pain and inflammation with nonsteroidal anti-inflammatory drugs, physical therapy, and sometimes antibiotics if infection remains.

Which Infections Trigger Reiter's Syndrome

Reiter's syndrome most commonly follows a sexually transmitted infection, particularly chlamydia. It can also develop after other bacterial infections of the urinary tract or after food-borne infections from bacteria like Salmonella, Shigella, Yersinia, or Campylobacter. In some cases, the original infection causes only mild symptoms or no symptoms at all, so you may not realize you had an infection when your joints begin to hurt.

The timing matters: symptoms of Reiter's syndrome typically appear one to three weeks after the infection, though the range can extend to several months. Your immune system has already cleared the infection by the time joint pain develops. This delay is why the condition is called reactive arthritis — your body is reacting to the infection after the fact, not responding to an active infection.

Not everyone who has one of these infections develops Reiter's syndrome. Genetics play a role: people who carry a genetic marker called HLA-B27 are at much higher risk. However, having HLA-B27 does not mean you will develop the condition. Many people with the marker never do.

Symptoms You May Experience

The hallmark symptom is arthritis — joint pain, swelling, and stiffness that usually affects your knees, ankles, feet, and heels. The pain is often worse in the morning or after activity. You may notice that only one side of your body is affected, or that symptoms move from one joint to another over time.

Beyond the joints, Reiter's syndrome can cause other symptoms. Conjunctivitis (eye inflammation) is common and causes redness, irritation, and a gritty feeling. Urethritis (inflammation of the urethra) can cause pain or burning during urination. Some people develop skin rashes, mouth sores, or nail changes. A few develop inflammation of the tendons or ligaments, causing heel pain or pain along the sole of the foot.

Symptoms vary widely from person to person. Some people have mild joint pain and no other signs. Others experience severe arthritis alongside eye and urinary symptoms. Most people recover gradually over weeks to months, though some have flare-ups or ongoing symptoms for years.

How Doctors Diagnose Reiter's Syndrome

There is no single test that confirms Reiter's syndrome. Instead, your doctor makes a diagnosis by connecting three pieces of information: a history of recent bacterial infection, current joint pain and swelling, and symptoms in other parts of your body (eyes, skin, or urinary tract). Your doctor will ask detailed questions about recent infections, sexual history, and any food poisoning or gastrointestinal illness.

Blood tests can support the diagnosis. A test for HLA-B27 is often ordered because the marker is present in 60 to 80 percent of people with Reiter's syndrome. However, a positive HLA-B27 result does not confirm the diagnosis on its own — it only shows you carry the genetic risk. Your doctor may also order tests to rule out other forms of arthritis, such as rheumatoid arthritis or lupus.

X-rays or ultrasound of the affected joints may be used to look for inflammation or damage. In some cases, your doctor will test your urine or take a sample from your urethra to check for lingering infection. The goal is to rule out other conditions that cause similar symptoms and to confirm that your arthritis developed after a recent infection.

Treatment Options and What to Expect

Nonsteroidal anti-inflammatory drugs (NSAIDs) like ibuprofen or naproxen are the first-line treatment. They reduce pain and swelling and allow you to move more comfortably. Your doctor may recommend a specific dose and duration based on the severity of your symptoms.

Physical therapy and rest are important parts of recovery. Resting the affected joints, applying ice, and doing gentle stretching exercises help reduce inflammation and restore movement. Your doctor or a physical therapist can show you exercises that are safe for your condition.

If the original infection has not fully cleared — particularly chlamydia — your doctor may prescribe antibiotics to eliminate it. This can sometimes reduce inflammation in the joints. In cases where NSAIDs alone do not control symptoms, your doctor may inject corticosteroids directly into the affected joint or prescribe stronger anti-inflammatory medications.

Most people recover within a few months to a year. Some experience lingering joint pain or occasional flare-ups. A small number develop chronic arthritis that persists for years. Regular follow-up with your doctor helps monitor your progress and adjust treatment as needed.

Reiter's Syndrome and Long-Term Outcomes

For most people, Reiter's syndrome is a temporary condition. Symptoms improve gradually, and many people return to normal activity within six to twelve months. However, outcomes vary. Some people have complete resolution of symptoms, while others experience recurring flare-ups triggered by stress, new infections, or other factors.

A small percentage of people develop chronic reactive arthritis that lasts years or becomes permanent. This is more likely if you have HLA-B27 or if your initial symptoms were severe. Long-term joint damage is uncommon but possible, particularly in the spine or large joints.

Lifestyle changes can help manage symptoms during recovery and reduce the risk of flare-ups. These include maintaining a healthy weight to reduce stress on joints, staying physically active within the limits of your pain, managing stress, and avoiding re-infection by practicing safe sex and food safety. If you develop symptoms again after recovery, contact your doctor promptly so treatment can begin early.

Frequently Asked Questions

Is Reiter's syndrome the same as rheumatoid arthritis?

No. Rheumatoid arthritis is an autoimmune condition where your immune system attacks your joints over time. Reiter's syndrome is a reactive condition that develops after an infection and usually resolves within months to a year. The causes, progression, and long-term outlook are different.

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

Yes, some people experience flare-ups or recurrence, particularly if they have HLA-B27 or if they develop another triggering infection. Flare-ups can occur months or years after the initial episode. If symptoms return, contact your doctor for evaluation and treatment.

Will Reiter's syndrome cause permanent joint damage?

Most people do not develop permanent damage. However, if symptoms are severe or last for years, some joint damage is possible, particularly in the spine or large joints. Early treatment and ongoing care reduce the risk of long-term complications.

Can I pass Reiter's syndrome to someone else?

No. Reiter's syndrome itself is not contagious. However, if you have an active infection like chlamydia, that infection can be transmitted. Once your infection is treated, you cannot pass the arthritis to others.

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

Contact your doctor and describe your symptoms, including any recent infections, joint pain, eye irritation, or urinary symptoms. Bring information about when the infection occurred and what symptoms you had. Your doctor can order tests and begin treatment to manage your pain and inflammation.