Have a cough that won’t quit? Been short of breath lately? It could be a nasty cold or flu virus, or the problem could be related to your rheumatoid arthritis (RA). RA attacks the joints, but it doesn’t always stop there. It can affect other organs, including the lungs. In fact, some 20 to 30 percent of RA patients will eventually develop RA-related lung disease. Doctors may classify a lung problem as restrictive lung disease (such as interstitial lung disease) or obstructive lung disease (such as chronic obstructive pulmonary disease or asthma). Both result in shortness of breath.