My knees do not hurt day-to-day standing, sitting, walking etc - but they hurt when pedaling on the bike or walking up steps. It's not major, but it's a consistent presence. It goes away with OTC pain meds, so my doc says that I don't need to worry about it yet. I'm not so sure, since it's been going on for several months now without really changing one way or the other. I haven't thought about whether it's under/near the patella or not - I'll start to pay closer attention so I can give more details that just "My knee hurts". This is good info to read.