You want to hop on the bike, hit the tennis court or work on the car, but stiffness in the joints causes you to hold off. This may be a problem shared by millions of Americans, new research shows.

For a minority of people with psoriasis, the possibility of developing a related form of arthritis can be a major concern. Disease treatments sometimes determine how much relief psoriatric arthritis sufferers might get from their symptoms.

Rheumatoid arthritis and psoriatic arthritis share many characteristics. While a certain class of medications — called anti-TNFs — has been shown to be a helpful treatment for rheumatoid arthritis, it remains unclear how well they work for patients with psoriatic arthritis.

The type of medical care patients get depends on several factors. Some patients with psoriasis, or the arthritis that can accompany psoriasis, don't believe they get enough quality care.

There's osteoarthritis. And rheumatoid arthritis. And infectious arthritis, childhood arthritis, Still's disease, lupus, Sjogren's disease and many more. In total, there are more than 100 kinds of arthritis.

Men and women are different in mind and body. Recent research suggests that gender may influence the way psoriatic arthritis affects patients.

Humira (adalimumab) is a medication used to treat a variety of diseases. As the medication is being prescribed to more and more patients, researchers wanted to see if there were any side effects they didn't know about before.

Arthritis symptoms can get in the way of many social activities, which can affect quality of life. So researchers wanted to know which aspects of arthritis most affected social life.

Three medicines are most commonly used to treat psoriatic arthritis. But is one better than the others?

Inflammation causes joint pain in people with psoriatic arthritis. It is also related to dental health. Does this make people with psoriatic arthritis at risk for dental health problems?