Mold grows in dark, wet places.  Condensation forms when you blow into your instrument, making the inside warmer than the outside, causing the inside to get wet.  If you then put it into a dark instrument case, you have the recipe for making fungus that you’re breathing in each time you play!!!

 

Diseases associated with inhaling fungal spores from mold can include tremors, chronic fatigue syndrome, and cancer.  Clean your instrument with a cloth after every use, and have it professionally cleaned once a year.

 

Check out some of these instructions on assembly and care of your instrument.

 

...and listen to this article on the dangers of not cleaning your instrument.