My father recently did a health check up in which chest x-ray was done and there were some shadows in both the lungs,then done CT SCAN reports showed that there are multiple nodules in the lungs but all other reports are normal.liver test,kidney,urea, creatinine,spot urine test only my father had diabetes. He has asthama issue also but he is not facing any kind of other problem.he had left smoking 1 year back and also he was not chain smoker. What should we do now? Please help.