Right knee cap or underneath kneecap hurts. No recent injury that I can recall but I am a CNA who works with an 82 male who has had total revision of hip ( lots of lifting and transferring ). Pain has come and gone 3 or 4 times over past several weeks but usually goes away after resting it. Tonight no such relief. Not bad pain, just really uncomfortable. This is the same knee I injured skiing when I was 20yrs old (knee brace for 1 month). 52yr old female. When I bend knee, kneecap makes and feels slightly crunchy .