What Is Rheumatoid Arthritis? A Nurse Explains the Basics

By Anna Curran, RN, BSN, PHN · Last reviewed October 2026

What is rheumatoid arthritis? Rheumatoid arthritis (RA) is a long-term autoimmune disease in which your immune system attacks the lining of your joints, causing pain, swelling and stiffness. It most often starts in the small joints of the hands and feet, and it can affect other parts of the body too. There is no cure yet, but early treatment can calm the disease and protect your joints.

If you or someone you love was just told “it might be RA,” you probably have a lot of questions. Let’s walk through the basics in plain language.

What Is Rheumatoid Arthritis? An Autoimmune Joint Disease

Your immune system is supposed to protect you from germs. In an autoimmune disease, it gets confused and attacks your own healthy tissue.

In RA, the main target is the synovium. This is the thin lining inside your joints. When it is attacked, it becomes inflamed, thick and swollen. Over time, that ongoing inflammation can damage the cartilage and bone in the joint. It can also weaken the muscles, tendons and ligaments that hold the joint steady.

That is why RA is more than “achy joints.” It is an active disease process. Left untreated, it can lead to joints that are damaged, unstable or out of shape.

RA can also affect more than joints. It can involve the eyes, lungs, heart, skin, blood vessels and blood. You can read more about these effects in our article on rheumatoid arthritis symptoms.

How Rheumatoid Arthritis Differs From Osteoarthritis

Many people mix up rheumatoid arthritis and osteoarthritis (OA). They are very different conditions.

	Rheumatoid arthritis	Osteoarthritis
Cause	Immune system attacks the joint lining	Cartilage wears down over time
Pattern	Often the same joints on both sides of the body	Often starts in one joint at a time
Common joints	Small joints of hands, wrists and feet	Weight-bearing joints like hips, knees and lower spine
Morning stiffness	Often lasts more than 30 minutes	Usually eases within 30 minutes of moving
Whole-body symptoms	Fatigue, low-grade fever, poor appetite	Usually limited to the joint

Osteoarthritis is linked to wear on the joint over the years. RA is driven by inflammation from the immune system. Some people have both, which is one reason a careful exam matters.

Who Gets Rheumatoid Arthritis?

Anyone can get RA, including younger adults. Children can get a related condition called juvenile idiopathic arthritis.

Here is what we know about who is more likely to develop it:

Women: According to the CDC, women are two to three times more likely than men to have RA.
Age: RA often begins in middle age. The ACR notes symptoms usually start between ages 30 and 50, and the CDC says risk is highest in adults ages 50 to 59.
Family history: Certain genes raise the risk, but many people with those genes never get RA.
Smoking: Smoking raises the risk of RA and can make the disease worse.
Other factors: Excess weight and gum disease (periodontitis) are also linked to higher risk.

No one knows exactly what causes RA. Experts think it is a mix of genes and things in the environment, and hormones may play a role. It is not caused by anything you did or did not do.

How Rheumatoid Arthritis Is Diagnosed

There is no single test that proves you have RA. Your doctor puts together several pieces:

Your story: Which joints hurt, how long you have been stiff in the morning and how long symptoms have lasted. Joint swelling that lasts more than 6 weeks is a sign of ongoing inflammation.
A physical exam: Your provider checks your joints for swelling, warmth and tenderness.
Blood tests: These look for signs of inflammation and certain antibodies.
Imaging: X-rays, ultrasound or MRI can show joint changes.

What are RF and anti-CCP?

Two blood tests often come up when RA is being checked:

Rheumatoid factor (RF): An antibody found in many people with RA. It can also show up in other conditions and in some healthy people.
Anti-CCP (CCP antibodies): An antibody that is more specific to RA. It is found in most people who have the disease.

These tests are usually ordered together. A positive anti-CCP with a negative RF may point to early RA. But a negative result on both does not always rule RA out. Some people with RA test negative.

Your doctor may also check ESR and CRP. These measure general inflammation in the body. They are not specific to RA, but they help track how active the disease is.

Why Early Treatment Matters

This is the most important part of this article. With RA, time matters.

The inflammation in RA can damage joints. The CDC and the American College of Rheumatology (ACR) both stress that early diagnosis and treatment help prevent joint damage and disability.

The main medicines are called DMARDs (disease-modifying antirheumatic drugs). Unlike plain pain relievers, they work to slow the disease itself. Methotrexate is usually the first choice. If it is not enough, there are other options, including biologics and newer pills. Our rheumatoid arthritis treatment article covers these in detail.

A rheumatologist is a doctor who specializes in arthritis and autoimmune joint disease. If your primary care provider suspects RA, ask about a referral. RA is best diagnosed and managed by a rheumatologist.

What Is the Outlook With Rheumatoid Arthritis?

RA is a lifelong condition, and there is no cure yet. That can feel heavy to hear. But there is real reason for hope.

The goal of treatment is remission, or as close to it as possible. That means few or no signs of active disease. With today’s treatments, many people reach low disease activity and stay active in work and family life.

RA tends to come and go. You may have flares, when symptoms suddenly get worse, and calmer periods, when symptoms ease or fade. Many people change medicines at least once over the years, and that is normal.

RA can raise your risk of some other health problems. These include heart disease, lung disease, thinning bones (osteoporosis) and infections. Regular follow-up visits help your care team catch and manage these early.

Things You Can Do Starting Today

Medicine is the foundation of RA care. Daily habits can support it:

Stay active. Gentle, low-impact movement like walking, swimming or warm-water exercise helps keep joints flexible and muscles strong.
Do not smoke. If you smoke, ask your care team for help quitting. Smoking can make RA worse.
Aim for a healthy weight. Less weight means less stress on your joints.
Protect your joints. Avoid injuries and ask about tools that make daily tasks easier.
Keep your appointments. Regular visits and lab work keep your treatment safe and on track.
Rest when you are tired. Fatigue is real in RA. Rest is part of the plan, not a failure.

Frequently Asked Questions

Is rheumatoid arthritis the same as regular arthritis?

No. “Arthritis” is a general word for joint inflammation, and there are many types. Osteoarthritis comes from wear on the joint over time, while rheumatoid arthritis is an autoimmune disease where the immune system attacks the joint lining.

Can you have rheumatoid arthritis with a negative blood test?

Yes. Some people with RA have negative RF and anti-CCP tests. Your doctor will look at your symptoms, exam and imaging along with your labs.

Is rheumatoid arthritis hereditary?

Genes play a role, and having a family member with RA can raise your risk. But many people with a family history never get it, and many people with RA have no family history. Smoking and other factors also matter.

Can rheumatoid arthritis go away?

There is no cure yet. But with treatment, many people reach remission or low disease activity, where symptoms are few or gone. Do not stop your medicine on your own when you feel better, since RA can come back; talk with your rheumatologist first.

The Bottom Line

Rheumatoid arthritis is an autoimmune disease in which the immune system attacks the joint lining, often in the hands and feet on both sides of the body. It is different from osteoarthritis, which comes from joint wear. Blood tests like RF and anti-CCP help with diagnosis, but no single test decides it. Early treatment with a rheumatologist gives you the best chance to protect your joints and feel well.