The two most common forms are osteoarthritis and rheumatoid arthritis, but there are more than 100 kinds

Osteoarthritis happens when the cartilage that cushions your joints wears down over time. It usually develops slowly, often after years of use or injury. You might notice stiffness in the morning or pain that gets worse as the day goes on. It most often affects the knees, hips, hands, and spine.

Rheumatoid arthritis is different — it is an autoimmune disease, meaning your immune system attacks the lining of your joints by mistake. It can come on suddenly and usually affects both sides of your body equally (both hands, both knees). It often causes swelling, warmth, and redness in the joints, and can make you feel tired or feverish.

Beyond these two, there are forms like gout (caused by uric acid crystals in joints), lupus (an autoimmune disease that affects joints and other organs), and psoriatic arthritis (linked to the skin condition psoriasis). Each type has different causes, different joints it tends to hit, and different ways to manage it.

Key Takeaways

  • Osteoarthritis is wear-and-tear arthritis that develops gradually, usually in weight-bearing joints like knees and hips.
  • Rheumatoid arthritis is an autoimmune condition that often strikes suddenly and affects joints on both sides of the body.
  • Gout, lupus, and psoriatic arthritis are three other common types, each with distinct causes and patterns.
  • Knowing which type you have matters because treatment approaches differ — what works for one type may not work for another.
  • A doctor can identify your type through blood tests, imaging, and a description of your symptoms and how they started.

Osteoarthritis: The wear-and-tear form

Osteoarthritis is the most common type overall. It develops when the smooth cartilage covering the ends of bones gradually breaks down. Without that cushion, bones rub against each other, causing pain, stiffness, and sometimes swelling. The process usually takes years, which is why osteoarthritis is more common as you get older — though it can start earlier if you have had a joint injury or do repetitive work.

You might notice pain that is worse after activity or at the end of the day, and stiffness that improves once you move around. The knees, hips, lower back, and hands are the most common sites. Unlike rheumatoid arthritis, osteoarthritis does not usually cause redness or warmth in the joint, and it does not make you feel systemically ill.

Managing osteoarthritis often involves staying active (movement helps keep joints mobile), maintaining a healthy weight, using heat or ice, and sometimes over-the-counter pain relievers. Your doctor may also suggest physical therapy or, in some cases, injections or surgery.

Rheumatoid arthritis: The autoimmune form

Rheumatoid arthritis occurs when your immune system mistakenly attacks the synovial membrane — the lining of your joints. This causes inflammation, swelling, and pain. Unlike osteoarthritis, it can develop fairly quickly, sometimes over weeks or months. It typically affects the same joints on both sides of your body: both wrists, both knees, both hands.

People with rheumatoid arthritis often report morning stiffness that lasts an hour or more, joint swelling that feels warm to the touch, and fatigue or low-grade fever. Over time, the inflammation can damage the joint structure itself if not treated. Blood tests can show specific markers — like rheumatoid factor or anti-CCP antibodies — that help confirm the diagnosis.

Treatment for rheumatoid arthritis is usually more aggressive than for osteoarthritis because early intervention can slow or stop joint damage. Doctors often prescribe disease-modifying antirheumatic drugs (DMARDs) or biologic medications that calm the immune system. Physical therapy and staying active are also important parts of managing the condition.

Gout: The crystal-based form

Gout is caused by a buildup of uric acid in the blood, which forms needle-like crystals in the joints. It typically strikes suddenly — often at night — with intense pain, redness, and swelling, usually in the big toe but sometimes in the ankle, knee, or wrist. An attack can last days or weeks if untreated.

Gout is more common in men and can run in families. Certain foods (red meat, organ meats, some seafood), alcohol, and dehydration can trigger attacks. Between attacks, you may have no symptoms at all. A doctor can confirm gout by testing fluid from the joint or by checking your uric acid level in the blood.

Treatment during an acute attack usually involves anti-inflammatory medications to reduce pain and swelling. Long-term management focuses on lowering uric acid levels through medication, dietary changes, and staying well-hydrated. Preventing future attacks is the main goal once you know you have gout.

Lupus and psoriatic arthritis: Autoimmune forms with broader effects

Lupus (systemic lupus erythematosus, or SLE) is an autoimmune disease that can affect many parts of your body — joints, skin, kidneys, heart, and lungs. Joint pain and swelling are common, but lupus also causes fatigue, a butterfly-shaped rash across the cheeks and nose, and sensitivity to sunlight. It is more common in women and people of color.

Psoriatic arthritis develops in some people who have psoriasis, a skin condition that causes red, scaly patches. The arthritis can appear before, during, or after the skin symptoms. It can affect any joint and sometimes causes swelling in the fingers or toes that looks like sausages. Like rheumatoid arthritis, it is an autoimmune condition and can damage joints over time if not treated.

Both lupus and psoriatic arthritis require a doctor's diagnosis and ongoing monitoring. Treatment depends on which organs are involved and how severe the symptoms are, but often includes anti-inflammatory medications, immunosuppressants, or biologic drugs.

Other types: Ankylosing spondylitis, reactive arthritis, and more

Several other forms of arthritis exist but are less common. Ankylosing spondylitis primarily affects the spine and sacroiliac joints (where the spine connects to the pelvis), causing stiffness and pain that is often worse in the morning. Reactive arthritis develops after a bacterial infection elsewhere in the body — often in the gut or urinary tract — and usually resolves on its own over weeks or months.

There are also forms linked to other conditions: arthritis that comes with inflammatory bowel disease (Crohn's disease or ulcerative colitis), arthritis from Lyme disease (after a tick bite), and arthritis from viral infections. Some people develop arthritis after an injury or surgery. Each type has its own pattern of which joints are affected and how quickly symptoms appear.

If your symptoms do not fit the pattern of osteoarthritis or rheumatoid arthritis, or if you have other symptoms (rash, eye problems, digestive issues, fever), mention that to your doctor. These details help narrow down which type you have.

How doctors figure out which type you have

Your doctor will start by asking about your symptoms: which joints hurt, when the pain started, whether it is worse in the morning or evening, and whether you have other symptoms like fatigue or rash. They will examine your joints for swelling, warmth, and range of motion.

Blood tests are often the next step. Different types of arthritis show different markers. Rheumatoid arthritis may show rheumatoid factor or anti-CCP antibodies. Lupus shows antinuclear antibodies (ANA). Gout is confirmed by finding uric acid crystals in joint fluid. Imaging — X-rays or ultrasound — can show how much damage has occurred and help rule out other conditions.

Sometimes diagnosis takes time, especially if your symptoms are mild or unusual. Do not hesitate to ask your doctor which tests they are running and what they are looking for. Knowing your type of arthritis helps you and your doctor choose the right treatment and understand what to expect.

Frequently Asked Questions

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

Yes, though it is not common. Some people develop osteoarthritis in their knees and rheumatoid arthritis in their hands, for example. If you have symptoms in different joints or symptoms that do not fit one pattern, tell your doctor — they may run tests to check for multiple types.

Is arthritis always painful?

Not always. Some people have arthritis that shows up on imaging or blood tests but causes little or no pain. Others have flare-ups where symptoms are severe, then quiet periods with minimal discomfort. Pain level varies widely depending on the type, which joints are affected, and how advanced the condition is.

Can young people get arthritis?

Yes. Rheumatoid arthritis, lupus, and psoriatic arthritis can strike at any age. Gout can develop in younger men. Even osteoarthritis can appear earlier if there has been a joint injury or repetitive strain. If you have joint pain that lasts more than a few weeks, see a doctor regardless of your age.

Does the type of arthritis I have affect how I should exercise?

Yes. With osteoarthritis, low-impact activities like walking, swimming, or water aerobics are usually gentler on joints. With rheumatoid arthritis, you may need to rest during flare-ups but stay active during calmer periods. A physical therapist can design a plan suited to your type and current symptoms.

Can arthritis go away on its own?

Reactive arthritis sometimes resolves without treatment after a few weeks or months. Most other types are chronic, meaning they persist over time, though symptoms can improve with treatment and management. Early treatment, especially for rheumatoid arthritis, can slow or stop progression.