Psoriatic arthritis affects patients with skin psoriasis and occurs equally among men and women, usually in their 3rd to 5th decade. Patients frequently have active skin psoriasis or nail changes. Arthritis can present in different ways, sometimes with few joints and other times, multiple joints. About 1/3rd patients can also have spinal involvement. Sausage digits or tendonitis are also common in psoriatic arthritis patients. There is stiffness, swelling, and reduced mobility, with patterns that vary widely between individuals. Most patients have skin psoriasis for years before they develop psoriatic arthritis.Psoriatic arthritis often follows a fluctuating course, with periods of increased symptoms and relative improvement. There is no definitive blood test for psoriatic arthritis. Early recognition is important to prevent long term joint damage as well as other complications.