Hello,My StepFather was diagnosed with lung cancer last year.  He had chemo and radiation therapy,  No more cancer!
Hi, dairy have gone through your question. I can understand your concern. He has history of lung cancer and COPD. Loss of appetite is not due to COPD.  It may be due to his infection and Chat Doctor.  He should continue taking antibiotics.  Once his infection is cured his appetite will improve automatically.  Hope I have answered your question, if you have doubt then I will be happy to answer. Thanks for using Chat Doctor. Wish you a very good health.