Symmetric Psoriatic Arthritis makes up roughly half of all psoriatic arthritis cases, it is similar to rheumatoid arthritis and can be just as disabling.
Asymmetric Psoriatic Arthritis is fairly mild and affects about a third of patients. Usually it involves only a few joints.
Arthritis Mutilans is found in a minority of sufferers and is quite severe, and can also be deforming. It progresses over months and years and causes extreme joint damage.
Spondylitis tends to be localized to the spine and neck, where it causes stiffness, although it can effect hands and feet.
Distal interphalangeal predominant is also a much less common form of psoriatic arhtiritis. It’s hallmark is inflammation and stiffness in the joints at the ends of the fingers and toes. Often there are noticeable nail changes as well.