Psoriatic arthritis is a type of inflammatory arthritis that will develop in up to 30 percent of people who have the chronic skin condition psoriasis. The exact causes are not yet known, but a number of genetic associations have been identified in a genome-wide association study of psoriasis and psoriatic arthritis.
Diagnosing arthritis can be tricky, with symptoms coming and going and so many types to consider and eventually rule out – including those with similar symptoms like psoriatic arthritis, rheumatoid arthritis, osteoarthritis and gout. That’s why people sometimes are initially misdiagnosed and told they have one form of arthritis only to find out later they have another kind entirely.
Even though psoriatic arthritis, or PsA, is an inflammatory form of arthritis, it is sometimes confused with osteoarthritis, or OA, which is not. It also can be mistaken for other forms of inflammatory arthritis, such as rheumatoid arthritis (RA), or gout. Below are some tips to help avoid a psoriatic arthritis misdiagnosis. Another way to make sure you get a proper diagnosis is to see a rheumatologist – a doctor trained in working with arthritis and related conditions.
- If you have joint pain, and then develop the red, flaky skin that signals psoriasis, along with nail pitting, don’t rule out PsA. Psoriasis usually manifests before psoriatic arthritis symptoms, but not always and sometimes never.
- If you have psoriasis symptoms and nail pitting first, and then develop joint pain, PsA is likely the culprit, particularly if there is joint swelling. But you can have psoriasis and a form of arthritis that isn’t PsA. It also depends on your age.
- If a single joint becomes swollen and extremely painful almost overnight, it’s probably gout. Unlike psoriatic arthritis, there is a surefire way to diagnose gout – examine joint fluid under a microscope. Uric acid crystals signal gout, which develops when the body can’t process uric acid, or produces too much.