 [ Symptoms ] what is the cause of scarred lungs  i have been sick for over one month with asthma had 2 chest xrays to rule out pneumonia good news no fluid or pneumonia but longs show scarring i am still short of breath coughing up yellow phlem so what causes scarred lungs could that be my problem [ Disease ] chest infection seems more likely this can lead to radiating pain in arms take proper antibiotics after getting xray done another possibility is a nerve compression at the neck level mri will be helpful