Much like psoriasis, psoriatic arthritis occurs when the immune system targets the joints and causes inflammation and damage. Psoriatic arthritis is a possible complication due to psoriasis, although not everyone who experiences psoriasis will develop psoriatic arthritis. Symptoms include localized tenderness, pain, and swelling, along with joint stiffness and reduced range of motion. There are also generalized symptoms that affect the entire body, such as chronic fatigue. Women and men between the ages of 30 and 50 are typically affected. Talk to your healthcare provider about treatment options that can offer the best results with minimal side effects.