As a result of the chronic inflammation resulting from the arthritis, the small airways of the lungs can become obstructed, causing the build-up of mucus.
Similarly, to the lung scarring, this can cause shortness of breath, a chronic dry cough, fatigue, and weakness.
The NHS mentions that arthritis can affect the heart too, inflaming the tissue leading to a condition known as pericarditis.
This results in chest pain.