The disease that is the world's longest word is Pneumonoultramicroscopicsilicovolcanoconiosis.
Pneumonoultramicroscopicsilicovolcanoconiosis is a 45 letter long word and is a lung disease that is caused by breathing in silica dust.
Pneumonoultramicroscopicsilicovolcanoconiosis is also referred to by a shorter word and easier to pronounce and spell word which is Pneumoconiosis.
Pneumoconiosis is one of a group of interstitial lung disease caused by breathing in certain kinds of dust particles that damage your lungs.
Because you are likely to encounter these dusts only in the workplace, pneumoconiosis is called an occupational lung disease.
Pneumoconiosis usually take years to develop.
One of the most common forms is coal worker's pneumoconiosis (CWP).
This is also called black lung disease. It's caused by breathing in coal dust.
Another form is brown lung, which comes from working around dust from cotton or other fibers.