I run a lot and when so at one point something weird was going on in my knee joint, so I stopped running for a week but it is still there and sometimes it kinda hurts. But then when I walk for a little while something pops in my joint and it is back to normal again for about half a day. But I don't want to go to the doctor because I want to join special forces, and I am afraid that if I go to the doctor I won't get cleared by the military. So does anyone know what is going on?