Hello @togerm, Welcome to Mayo Connect! I'm glad that your cancer was found so you and the doctors can take action now. I know it's common to want to know what caused the cancer, but sometimes we will just never know. Lung cancer has been one of the most common cancers across the world for many years, including the years prior to COVID appearing in 2020. I'm not a clinician or researcher, and my lung cancer was growing and diagnosed before COVID. Doctors that assume all lung cancers are caused by smoking aren't doing people like us any favors either. I don't know what caused my cancer (I'm a never smoker). I was told that sometimes biology makes mistakes, and most of those mistakes are corrected by the amazing systems in our bodies that protect us from bad things, but sometimes those mistakes can't be corrected, cells multiply and create cancer. I know that may seem simple, but it helped me to stop searching for the root cause.
I wish you well with your appointment. The PET should show if there are other areas of concern. Are you getting a list of questions together for the appointment? Do you have someone that can go with you?