Pain is typically ranked by both patients and physicians as the most important symptom of psoriatic arthritis (PsA) to assess and treat. Although the predominant concept of the etiology of pain in PsA is that of inflammation in peripheral joints, entheses, and bone signaling through peripheral nociceptive fibers, perceived as pain in the central nervous system, it is actually more complex than that. The ability of a treatment to ameliorate pain is one of the principle measures of its effectiveness. Thus pain improvement or worsening are key determinants of shared decision making about treatment in PsA.