An allergy is caused by hypersensitivity of the immune system 
Tell me about it! Mold really gets to me.
According to the CDC, "mold can cause excessive exposure to mold-contaminated materials can cause adverse health effects in susceptible persons"
That's certainly true. There is mold where I work and sometimes it reeks all kinds of havoc on me.
hen mold spores are present in abnormally high quantities, they can present especially hazardous health risks to humans