Most commonly, molds affect many people by allergenic reactions. Symptoms include nasal stuffiness, eye irritation, sneezing, wheezing, and skin irritation. However, many people report more severe reactions to mold. These symptoms go beyond the basic skin and respiratory irritations to include fever, and asthmatic attacks. Chronic lung disease, such as obstructive lung disease, develop mold infections inside of the lungs. The 2004 Institute of Medicine found evidence to link upper respitory diseases to otherwise healthy individuals.
Mold in lungs.
More information available at Center for Disease Control.