There are more than 100 types of arthritis, but most people experience one of a few common ones

Arthritis is not one disease — it is a group of conditions that cause joint pain, stiffness, and swelling. The two most common types are osteoarthritis and rheumatoid arthritis, which account for the majority of cases. Beyond those, there are inflammatory types like gout and lupus-related arthritis, infectious types triggered by bacteria or viruses, and rare inherited forms. Knowing which type you have matters because the cause is different, the way it progresses is different, and what helps is different.

Your doctor can usually identify your type through a combination of your symptoms, blood tests, and imaging like X-rays. Some types develop slowly over years; others come on suddenly. Some affect one joint; others spread throughout your body. Understanding the distinction helps you know what to expect and what treatment options exist.

Key Takeaways

  • Osteoarthritis is the most common type and develops when cartilage wears down over time, usually in weight-bearing joints like knees and hips.
  • Rheumatoid arthritis is an autoimmune condition where the body attacks joint linings, often affecting multiple joints symmetrically and causing systemic symptoms.
  • Other significant types include gout (caused by uric acid crystals), lupus-related arthritis, and infectious arthritis triggered by bacteria or viruses.
  • Your type of arthritis determines which treatments work best, so getting an accurate diagnosis from your doctor is the first step toward managing your symptoms.

Osteoarthritis: The wear-and-tear type

Osteoarthritis is the most common form of arthritis. It develops when the cartilage that cushions the ends of your bones gradually wears away. This usually happens over many years and is often called "wear-and-tear" arthritis because it is linked to age, repetitive use, and joint stress.

Osteoarthritis most often affects joints that bear weight or move frequently: knees, hips, lower back, neck, and hands. You might notice stiffness when you first wake up or after sitting still, pain that worsens with activity, and a grinding or creaking sensation in the joint. Symptoms typically develop slowly and may come and go depending on how much you use the joint.

Risk factors include age (it becomes more common after 50), previous joint injury, being overweight, and family history. Unlike some other types, osteoarthritis does not usually cause systemic symptoms like fever or fatigue, and blood tests are often normal.

Rheumatoid arthritis: The autoimmune type

Rheumatoid arthritis is an autoimmune condition in which your immune system mistakenly attacks the lining of your joints. This causes inflammation, pain, swelling, and eventually can damage the joint structure itself if left untreated.

Rheumatoid arthritis often affects multiple joints at the same time, usually in a symmetrical pattern — if your left knee hurts, your right knee probably does too. It commonly involves the hands, wrists, feet, and knees. Unlike osteoarthritis, it can come on relatively quickly, sometimes over weeks or months. You may also feel fatigue, low-grade fever, loss of appetite, or general malaise alongside the joint symptoms.

Blood tests can detect specific markers like rheumatoid factor or anti-CCP antibodies, which help confirm the diagnosis. Rheumatoid arthritis is more common in women than men and often begins between ages 30 and 60, though it can occur at any age. Early treatment with disease-modifying medications can slow or halt progression, which is why getting diagnosed promptly matters.

Gout: The crystal-deposit type

Gout is caused by the buildup of uric acid crystals in joints, usually triggered by diet, dehydration, or your body's inability to process uric acid efficiently. It typically strikes suddenly, often at night, with intense pain, redness, and swelling — most commonly in the big toe, but also in ankles, knees, wrists, and elbows.

A gout attack can last days to weeks and then disappear completely, sometimes for months or years. Between attacks, you may have no symptoms at all. However, repeated attacks can lead to chronic gout and permanent joint damage. Gout is more common in men, increases with age, and is linked to diet (especially red meat, organ meats, and alcohol), obesity, and certain medications like diuretics.

Blood tests showing elevated uric acid levels and imaging can help confirm gout. Treatment focuses on managing acute attacks with anti-inflammatory medications and preventing future ones by lowering uric acid through medication and lifestyle changes.

Other significant types: Lupus, infectious, and inherited arthritis

Lupus-related arthritis occurs in people with systemic lupus erythematosus (SLE), an autoimmune disease that affects multiple body systems. The arthritis is usually milder than rheumatoid arthritis and less likely to cause permanent joint damage, but it comes alongside other lupus symptoms like rashes, kidney problems, and fatigue.

Infectious arthritis develops when bacteria, viruses, or fungi enter a joint, usually through an injury or bloodstream infection. It typically affects one joint, comes on suddenly with severe pain, swelling, warmth, and sometimes fever. Prompt treatment with antibiotics or antivirals is important to prevent permanent damage.

Inherited forms like hemophilic arthritis (in people with hemophilia) or arthritis linked to genetic conditions are less common but follow predictable patterns based on family history. Your doctor can identify these through genetic testing and family medical history.

How doctors tell the difference

Your doctor will start by asking about your symptoms: which joints hurt, how long it has been happening, whether it is worse at certain times of day, and whether you have other symptoms like fever or fatigue. They will examine your joints for swelling, warmth, range of motion, and deformity.

Blood tests can reveal markers of inflammation (like erythrocyte sedimentation rate or C-reactive protein), autoimmune markers (like rheumatoid factor), or uric acid levels. X-rays or ultrasound can show cartilage loss, bone damage, or crystal deposits. Sometimes your doctor may take a sample of fluid from the joint itself to look for crystals or signs of infection.

Getting an accurate diagnosis usually takes one or more visits and may involve referral to a rheumatologist, a doctor who specializes in joint and autoimmune diseases. The diagnosis guides which treatments are most likely to work and what you can expect over time.

Why the type matters for treatment

Osteoarthritis is typically managed with pain relief, physical activity, weight management, and sometimes injections or surgery. Rheumatoid arthritis requires disease-modifying medications to slow the immune attack. Gout needs uric acid-lowering drugs and dietary changes. Infectious arthritis needs antibiotics. Lupus arthritis is managed as part of overall lupus treatment.

Some medications work for one type but not another, and some can actually make a different type worse. For example, certain anti-inflammatory drugs that help osteoarthritis may not be appropriate for rheumatoid arthritis. This is why knowing your specific type — and working with a doctor who knows it too — makes a real difference in how well you feel and how your joints hold up over time.

Frequently Asked Questions

Can you have more than one type of arthritis at the same time?

Yes. Some people develop osteoarthritis in their knees while also having rheumatoid arthritis in their hands, or gout alongside osteoarthritis. Your doctor can help sort out which symptoms come from which condition so each one is treated appropriately.

Does arthritis always get worse over time?

It depends on the type. Osteoarthritis typically progresses slowly over years. Rheumatoid arthritis can progress quickly without treatment but often stabilizes or improves with modern medications. Gout can stay mild with proper management. Early diagnosis and treatment give you the best chance of slowing progression.

Is there a blood test that shows what type of arthritis I have?

Blood tests can support a diagnosis — for example, rheumatoid factor suggests rheumatoid arthritis, and high uric acid suggests gout — but no single test definitively identifies every type. Your symptoms, physical exam, imaging, and sometimes joint fluid analysis together paint the full picture.

Can younger people get arthritis?

Yes. Rheumatoid arthritis often starts between ages 30 and 60. Gout can occur in younger adults, especially men. Lupus-related arthritis frequently begins in women in their 20s and 30s. Osteoarthritis is less common in younger people but can develop after a joint injury. Age is not a barrier to arthritis.

What should I do if I think I have arthritis?

Contact your primary care doctor and describe your symptoms: which joints hurt, how long it has been happening, and what makes it better or worse. They can do an initial evaluation and refer you to a rheumatologist if needed. Early evaluation helps identify the type and start appropriate management sooner.