Key takeaways
- Osteoarthritis is "wear and tear" of the cartilage, most often in the knees, hips, hands and spine.
- Inflammatory arthritis, such as rheumatoid arthritis, happens when the immune system attacks the joint lining.
- Morning stiffness under 30 minutes suggests osteoarthritis; stiffness lasting longer suggests inflammatory arthritis.
- Inflammatory arthritis needs early medical treatment to prevent joint damage.
Arthritis is one of the most common causes of joint pain and disability. The two main types, osteoarthritis (OA) and inflammatory arthritis (IA), can both cause pain and stiffness, but they're very different conditions with different treatments. Knowing which you have matters.
Osteoarthritis: wear and tear
Osteoarthritis is a degenerative joint disease. The smooth cartilage that cushions the ends of the bones gradually wears down, the bone beneath it changes, and the joint lining can become mildly inflamed. As cartilage thins, the joint becomes painful, stiff and sometimes swollen.
Risk factors: age, excess body weight, previous joint injuries, repetitive joint stress and family history.
Inflammatory arthritis: the immune system
Inflammatory arthritis, with rheumatoid arthritis (RA) as the best-known example, is an autoimmune condition. The immune system mistakenly attacks the lining of the joints (the synovium), which becomes inflamed and thickened and can eventually damage cartilage and bone. Unlike OA, it often affects many joints at once and can affect the whole body.
Genetics and environmental factors both play a role. Certain antibodies in the blood can appear years before symptoms start.
How the symptoms differ
| Osteoarthritis | Inflammatory arthritis | |
|---|---|---|
| Typical joints | Knees, hips, spine, base of the thumb | Small joints of the hands and feet first, often both sides |
| Pain pattern | Worse with activity, better with rest | Often worse after rest |
| Morning stiffness | Usually under 30 minutes | Usually longer than 30 minutes |
| Whole-body symptoms | Rare | Fatigue, low-grade fever, weight loss |
How each is diagnosed
Osteoarthritis is diagnosed mainly from your symptoms and exam, supported by X-rays that show narrowing of the joint space and bone spurs.
Inflammatory arthritis is diagnosed with a combination of exam findings, blood tests (such as rheumatoid factor, anti-CCP antibodies and markers of inflammation) and imaging. Ultrasound and MRI can pick up early changes that X-rays miss.
How each is treated
Osteoarthritis care focuses on easing pain and keeping the joint working: weight management, exercise, physical therapy and hands-on care, and when needed, medications such as acetaminophen or anti-inflammatories, or joint injections.
Inflammatory arthritis needs early medical treatment, usually from a rheumatologist, with disease-modifying medications such as methotrexate or biologic drugs. Early, consistent treatment is key to preventing permanent joint damage.
The bottom line
Both conditions cause joint pain, but they come from different processes and need different care. If you have joint swelling in several joints, long morning stiffness or fatigue, ask your doctor about testing for inflammatory arthritis. For osteoarthritis of the spine and joints, conservative care, the right exercise and good mechanics can go a long way.