Pneumonia is an infection that causes the air sacs of the lungs (doctors call these “alveoli”) to fill up with fluid or pus. That can make it hard for you to breathe in enough oxygen to reach your bloodstream.
Pneumonia can be caused by bacteria, viruses, or fungi. Sometimes, you can get it from breathing in toxic chemicals that damage your lung tissue.
Recommended Related to Lung Disease/Respiratory Problems
Shortness of breath is one of the telltale signs of idiopathic pulmonary fibrosis, but it's also a symptom of lots of other conditions. Your doctor may suggest several tests that can help confirm a diagnosis of IPF, which is brought on by scarring in your lungs.