Another doctor?

Dad is pretty much stable right now. If there is such a thing. But his cardiologist is sending dad to a lung specialist. Dad has been coughing/spiting up blood for a couple weeks now. So that has to be from the lungs. Of course I worry. I know I should not jump to conclusions, but it is something I do very well. Mom died from lung cancer, so that is where my mind goes when thinking about dad's lungs. Of course it could be something simple that some medicine can take care of. I pray that is it.