Not necessarily. A bad throw out bearing could and most times will make noise all the time. Sometimes worse when the pedal is mashed, sometimes not. Making sure the starter is disengaged is a pretty good on also. One that was in backwards can make constant noises also. Learned that one the hard way as a youngster. Although not always. Like has been said though. I'd shut 'er down and remove the dust cover and see if you can see any fresh marks anywhere. Use some safety glasses and turn the motor by hand and look, if you don't see anything I would probably lean towards the bearing, but this is also a guess based on online info. It's hard to troubleshoot online or over the phone. I can't really hear what the noise sounds like, but these are a few things that it could be.