Psoriatic arthritis is a form of arthritis that affects some people who have psoriasis — a condition that features red patches of skin topped with silvery scales. Most people develop psoriasis first and are later diagnosed with psoriatic arthritis, but the joint problems can sometimes begin before skin patches appear. Joint pain, stiffness and swelling are the main signs and symptoms of psoriatic arthritis. They can affect any part of your body, including your fingertips and spine, and can range from relatively mild to severe. In both psoriasis and psoriatic arthritis, disease flares may alternate with periods of remission. It can be a serious chronic inflammatory condition that can cause significant pain and, in severe cases, disability. But it's possible to manage your condition through medications and lifestyle changes. In most cases, the joint pain and inflammation caused by PsA respond well to treatment. Psoriatic arthritis can severely damage your joints if left untreated.