This condition leads your body to make a protein called cytokines, which causes inflammation. So your joints may swell and be painful or stiff. The proteins also make you tired, but doctors aren’t sure why. One reason might be that psoriatic arthritis forces your body to spend energy to attack your own immune system.
This disease also may prevent you from sleeping well. If that’s a problem, talk to your doctor. A medication may help you get better rest.