Hii, I recently had CT of whole abdomen, because I was having digestion issues and blood in stool,but everything was normal except it said that "Sections through lower chest reveal subsegmental atelectasis in postero basal segment of left lower lobe".And I also have shortness of breath.Then I met pulmonologist,did xray, spirometry,spo2 Xray was normal Spirometry was normal SPo2 was normal. He said it is due to anxiety.I am patient of anxiety as well from 4-5 years. So,what could be the cause?