Up to 8 percent of people who have psoriasis (a skin condition that is characterized by scaling and swelling) develop psoriatic arthritis. The condition occurs just as often in women as it does in men, and it is most likely to occur between the ages of 30 and 50. In a person with psoriatic arthritis, the joints (and sometimes other areas of the body) become inflamed. A few other symptoms of psoriatic arthritis include low back pain or neck pain; pitting, thickened, and discolored toenails or fingernails; and eye pain and redness. Among the risk factors for psoriatic arthritis are a family history of the condition, certain genetic factors, and trauma to the skin. Psoriatic arthritis can be treated through lifestyle changes, medications, and routine monitoring and ongoing care. Corticosteroids and analgesics are among the drugs used to treat psoriatic arthritis.