My knees pop and I can hear it, so can everyone else! I remember this since I was 7 or 8 years old.It only seems to hurt if it doesn t pop all the way,I ll then keep bending my knees until it does. It sounds like someone popping there knuckles which leads me to believe it can t be good.I was adopted and don t know any hereditary history of my biological mother. I m 26yrs old now, 5 2\