Oh yeah! People only see me on my good days when I'm walking and talking and taking care of business. They don't see me the next day when I can't move. Friends, relatives, have no idea. "You sound fine on the phone!" One friend is getting kind of miffed because I don't show up to watch the NFL 4 out of 7 nights(no longer just Sunday and Monday Night). I tell him I have to relax. He says, "You'll be sitting in a chair watching TV!".
Trying to explain PsA to well-meaning people with no understanding used to frustrate me something awful. These days I seldom talk about it except to the dr and people with similar conditions. I find I'm a happier person.