u/Artistic-Oil-1881

So I was already having terrible pain in my knee all day, that pain would come and go other days but that day was just constant pain for me. I went through the tsa and they saw something and pulled me to do a pat down, asked me if I was having pain in my knee. I was puzzled because how would they know that? Is it something serious? To this day I still get the pain in my knee and don’t know why I get it.