• 08 Sep, 2026
• UnityPain
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What Is Reactive Arthritis? | Unity Pain Modesto

You Are Not Alone in This

Waking up one day with swollen, painful joints — when just weeks before you felt fine — can be frightening and confusing. If a doctor has mentioned reactive arthritis, you may have a lot of questions. What caused it? Will it go away? What can be done to help? Living with joint pain is hard, and not knowing why it is happening makes it even harder. This article is here to help you understand reactive arthritis in simple, plain language so you can feel more informed and less afraid.

What Is Reactive Arthritis?

Reactive arthritis is a type of joint inflammation that happens as a reaction to an infection somewhere else in your body. The infection is usually in your gut, urinary tract, or genitals. Your immune system fights off the infection, but then it accidentally keeps attacking your own joints and tissues. This is why the condition is called “reactive” — your body is reacting to something that happened earlier.

In the past, reactive arthritis was sometimes called Reiter’s syndrome. Today, most doctors use the term reactive arthritis. It most often affects the knees, ankles, and feet, but it can also cause redness in the eyes, skin rashes, and sores in the mouth. Symptoms usually begin one to four weeks after the original infection. Many people do not even realize the two problems are connected.

Reactive arthritis is not contagious. You cannot catch it from another person. However, the bacterial infection that triggers it — such as Chlamydia trachomatis, Salmonella, or Campylobacter — can sometimes be passed from person to person. Treating that infection is an important part of managing the condition.

Who Gets Reactive Arthritis?

Reactive arthritis can affect people of all ages, but it is most commonly diagnosed in adults between the ages of 20 and 40. It tends to affect men slightly more often than women, though the gap is not as large as once believed. Anyone who gets one of the triggering bacterial infections could develop reactive arthritis, but not everyone does.

Researchers have found that a gene called HLA-B27 may play a role in who develops reactive arthritis after an infection. People who carry this gene may be more likely to get the condition, and they may have more severe symptoms. However, having this gene does not mean you will definitely develop reactive arthritis, and many people without this gene also develop it.

What Are the Symptoms?

The most common symptom is joint pain and swelling, especially in the larger joints of the lower body like the knees and ankles. The joints may feel warm and stiff, especially in the morning. Some people also feel pain in the lower back or buttocks, which can be a sign that the spine is involved.

Beyond the joints, reactive arthritis can cause other symptoms throughout the body. These may include:

• Red, painful, or irritated eyes (conjunctivitis or uveitis)
• Painful urination or discharge from the urinary tract
• Skin rashes, especially on the palms or soles of the feet
• Small sores inside the mouth
• Swollen fingers or toes that look like small sausages
• Heel pain or pain along the bottom of the foot

Not everyone has all of these symptoms. Some people only have mild joint pain. Others may feel quite ill and struggle with several symptoms at once. If you notice any of these signs after a recent infection, it is important to speak with a doctor as soon as possible.

How Is Reactive Arthritis Diagnosed?

There is no single test that can diagnose reactive arthritis on its own. Instead, your doctor will look at your full health picture. They will ask about any recent infections, your current symptoms, and your medical history. They may order blood tests to look for signs of inflammation or the HLA-B27 gene. They might also do tests to check for any lingering infection.

Imaging tests like X-rays or MRI scans can help doctors look at the health of your joints and rule out other causes of pain. Because reactive arthritis shares symptoms with other types of arthritis — such as rheumatoid arthritis or psoriatic arthritis — getting an accurate diagnosis is very important before starting any treatment plan.

How Is Reactive Arthritis Treated?

The good news is that many cases of reactive arthritis improve over time, often within a few months to a year. Treatment focuses on relieving pain and inflammation while the immune system settles down. Your doctor may recommend nonsteroidal anti-inflammatory drugs (NSAIDs) to help with swelling and discomfort. If an infection is still present, antibiotics may also be needed.

For more persistent or severe cases, other treatments may be considered. These can include corticosteroid injections directly into painful joints, which can bring fast relief. Physical therapy can also help you keep your joints strong and flexible while you recover. At a clinic like Unity Pain Management in Modesto, a care team can evaluate your specific needs and help create a plan — which may include joint injections, medication management, or physical therapy referrals — tailored to what your body needs.

Some people with long-lasting reactive arthritis may need stronger medications that calm down the immune system. These are usually managed by a rheumatologist. Your primary care doctor or pain specialist can help connect you with the right specialist if needed.

Living With Reactive Arthritis

Dealing with reactive arthritis can feel overwhelming, especially when it affects your ability to walk, work, or enjoy daily life. Rest when you need to, but try to stay as gently active as possible. Low-impact movement like swimming or stretching can help keep your joints from becoming too stiff.

It is also important to keep all follow-up appointments. Some people develop chronic reactive arthritis, meaning symptoms last longer than expected. Early and consistent care makes a real difference. If you are struggling to find the right support, the team at Unity Pain Management is here to help — and they welcome most insurance plans, making care more accessible.

A Word of Hope

If you have been diagnosed with reactive arthritis, please know that many people do recover well and go on to live full, active lives. The path may not always be straight, but with the right care and support, there is real reason for hope. You deserve to feel better, and you do not have to figure this out alone. Reach out to a trusted medical provider to start getting the answers and relief you need.

References

• Carter, John D. and Hudson, A.P. “Reactive Arthritis: Clinical Aspects and Medical Management.” Rheumatic Disease Clinics of North America. 2009.
• National Institute of Arthritis and Musculoskeletal and Skin Diseases. “Reactive Arthritis.” National Institutes of Health. 2023.
• Schmitt, S.K. “Reactive Arthritis.” Infectious Disease Clinics of North America. 2017.
• Leirisalo-Repo, M. “Reactive Arthritis.” Scandinavian Journal of Rheumatology. 2005.
• Mayo Clinic Staff. “Reactive Arthritis — Symptoms and Causes.” Mayo Clinic. 2023.