BRUCE STROBER, MD: People wake up in the morning often feeling like their joints are exceedingly stiff. In the more severe types of arthritis that joint stiffness can last anywhere from 30 minutes to three hours. But what they'll notice is that as the morning moves on their joints their ligaments grow less stiff.
ANNOUNCER: Inflammation of ligaments and tendons is also a common feature. Symptoms can be erratic.
PHILIP MEASE, MD: A person may go for periods of time where the problem is not too great. They can do their things as they normally would. But other times, it can hit them hard, and they just can't do normal functions because of the pain.
ANNOUNCER: Psoriatic arthritis can involve virtually any joint, but most commonly it affects the extremeties or the spine.
BRUCE STROBER, MD: That could be a finger, it could be a toe, it could be the ankle, knee. It doesn't have to be lots of toes or fingers; it could be one. It could be just one of your ankles. It could be just your lower back or the spine. It could be the neck.
ANNOUNCER: There is no specific test for diagnosising psoriatic arthritis.
BRUCE STROBER, MD: And it requires the clinician, either the rheumatologist or the dermatologist, to put together many different pieces of a puzzle and arrive at the diagnosis correctly.