Morning inflexibility. The mentioned above symptoms are not enough to put the proper diagnosis. A symptom of morning stiffness is one more thing which should be in place for a doctor to tell it is exactly psoriatic arthritis. Feels like the extremities are put in some tight pockets or gloves.” It seems like the person is wearing a tight corset, which limits the movements. With a relatively mild course of illness, the symptom is mostly gone in an hour or two after the patient has gotten out of bed. But with a severe course, this unpleasant feeling can persist until one hour in the afternoon or even longer.