The presence of rheumatoid arthritis alters how a person's immune system responds to foreign materials, such as dust from a coal mine. When a person with rheumatoid arthritis is exposed to such offensive materials, they are at an increased risk of developing pneumoconiosis.
Caplan's syndrome
Wagner's disease
Frey's syndrome
Alvarez' syndrome
Bowen–Conradi syndrome
Copenhagen disease
Freiberg disease
Barraquer–Simons syndrome