What does thickening of interstitial lung markings mean?

On a CT usually: This refers to a finding seen on x-rays, more specifically ct scans of the chest. It can be seen on plain chest x-rays, but is less reliable. It refers to a more prominent appearance of the normally very slight, nearly invisible linear markings near the periphery of your lungs. It can be caused by many things. "fibrosis" or scarring is the most concerning, but by no means the only cause.

Interstitial marking: This is frequently a non specific finding on radiographic evaluation of the lungs can be exaggerated by infection, fluid in lungs of cardiac or other origin and scarring from previous infection. There are other diseases that are more serious such as pulmonary fibrosis.All are speculative and if lung breathing symptoms follow up with your doctor and possibly a pulmonary specialist.