Is asthma often confused with something else. Like I said in a recent post I took a PFT when I was very sick with the flu and the test came back positive for asthma. I know that me being sick had something to do with the outcome. The person who replied to my post said that the reason the re****s were positive was because by me having to flu it caused my airways to get smaller and restricted. So is it possible that I was misdiagnosed because of I had the flu. PLEASE HELP.