Definition of Coal worker's pneumoconiosis:

Coal worker's pneumoconiosis is a lung disease caused by breathing in dust from coal, graphite, or man-made carbon for a long time.

Causes, incidence, and risk factors:

Coal worker's pneumoconiosis occurs in 2 forms: simple and complicated (progressive massive fibrosis, or PMF).

Your risk of developing the disease depends on how long you have been around the coal dust. Most people with this disease are older than 50. Smoking does not increase your risk of developing this disease, but it may have an additional harmful effect on the lungs.

If coal worker's pneumoconiosis occurs along with rheumatoid arthritis, it is called Caplan syndrome.