Should I worry or not?

Well let's see, lung cancer doesnt cause your hair to fall out, chemo does. The weight loss could be a lot of things, but I would think it's unlikely it would be that ! He may just want to do a over-all checkup on you just incase it's something there, he wouldn't wanna lose his md license now would he? He obviously has to check you all over. I would not freak out about cancer, your not sure what's going on, but just keep your appointments and stay strong!