Symptoms of Lung Cancer.......?

My father has been coughing up a grayish black sputum or phlem for the last year I guess. He has a few other things going on as well such as tremors of the hands and head (which he has had for years but slowly getting worse), weight loss, loss of appetite, he has trouble sleeping, extreme night sweats, and trouble cooling off after his body temp has been raised. He recently went to the Dr. And they did a chest x-ray and they told him that they saw scarring on the right lung, he went to the Dr. About a year ago about the phlem prob. And they did an x-ray at that time too and it was normal so this scarring apparently occured in the past year. My first question is are these symptoms of lung cancer? What could have caused the scarring on the lung? The Dr. Had asked if he had pnuemonia in the past but he didnt think so and he definantly hasnt in the past year. I know that a lot of his symptoms are that of hyperthyroidism, I was also wondering if the thyroid is affected by lung cancer? He is supposed to get the results of his blood work and a radiologist is supposed to look closer at the x-ray of the scarring. They are supposed to get back to him early this week coming. I am just very worried about him . If anyone knows the answers to any of my questions I would greatly appreciate it. Thank you so much. God bless!