The condition can look different from person to person.
One mild form affects five or more joints in pairs on both sides of your body, like both knees or both elbows.
The other mild type can show up anywhere, usually in just a few joints. It could make fingers and toes swell up like sausages.
Another kind of psoriatic arthritis mainly affects the ends of fingers or toes, including nails.
The fourth type inflames the spine and makes moving painful and difficult.
The last type, called arthritis mutilans, is the rarest. It can damage fingers and toes so badly that they don't work, and it often causes neck and lower back pain, too.